Ajax+PHP+MySQL 登陆示例，_PHP教程

Ajax+PHP+MySQL 登陆示例，

    PHP是一门很好的语言,可以很方便的开发web应用程序,下面介绍一下PHP如何通过AJAX方式实现登录功能:

1 login.php

登录界面中,javascript脚本用ajax方式异步请求dologin.php,dologin.php负责用户信息验证(包括验证码,php生成验证码可以自行搜索).登录界面的代码如下:

<span><span>  1</span> <span><?</span><span>php session_start();</span><span>?></span>
<span>  2</span> <span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</span><span>></span>
<span>  3</span> <span><</span><span>html </span><span>xmlns</span><span>="http://www.w3.org/1999/xhtml"</span><span>></span>
<span>  4</span>   <span><</span><span>head</span><span>></span>
<span>  5</span>     <span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=gb2312"</span> <span>/></span>
<span>  6</span>     <span><</span><span>title</span><span>></span>login<span></</span><span>title</span><span>></span>
<span>  7</span>     <span><</span><span>link </span><span>rel</span><span>="stylesheet"</span><span> type</span><span>="text/css"</span><span> href</span><span>="CSS/login.css"</span> <span>/></span>
<span>  8</span>     <span><</span><span>script </span><span>src</span><span>="JS/ajaxhelper.js"</span><span> type</span><span>="text/javascript"</span><span>></</span><span>script</span><span>></span>
<span>  9</span>     <span><</span><span>script </span><span>src</span><span>="JS/jquery-1.3.2.min.js"</span><span> type</span><span>="text/javascript"</span><span>></</span><span>script</span><span>></span>
<span> 10</span>     <span><</span><span>script </span><span>type</span><span>="text/javascript"</span><span>></span>
<span> 11</span>         <span>function</span><span> chkForm() {
</span><span> 12</span>             <span>if</span><span> (m$(</span><span>'</span><span>username</span><span>'</span><span>).value </span><span>==</span> <span>""</span><span>) {
</span><span> 13</span> 
<span> 14</span> <span>                alert(</span><span>'</span><span>用户名不能为空.</span><span>'</span><span>);
</span><span> 15</span> <span>                m$(</span><span>'</span><span>username</span><span>'</span><span>).focus();
</span><span> 16</span>                 <span>return</span> <span>false</span><span>;
</span><span> 17</span> 
<span> 18</span> <span>            }
</span><span> 19</span>             <span>if</span><span> (m$(</span><span>'</span><span>password</span><span>'</span><span>).value </span><span>==</span> <span>""</span><span>) {
</span><span> 20</span> 
<span> 21</span> <span>                alert(</span><span>'</span><span>密码不能为空.</span><span>'</span><span>);
</span><span> 22</span> <span>                m$(</span><span>'</span><span>password</span><span>'</span><span>).focus();
</span><span> 23</span>                 <span>return</span> <span>false</span><span>;
</span><span> 24</span> 
<span> 25</span> <span>            }
</span><span> 26</span>             <span>if</span><span> (m$(</span><span>'</span><span>password</span><span>'</span><span>).value </span><span>!=</span> <span>""</span> <span>&&</span><span> m$(</span><span>'</span><span>username</span><span>'</span><span>).value </span><span>!=</span> <span>""</span><span>) {
</span><span> 27</span> 
<span> 28</span>                 <span>var</span><span> xmlhttp </span><span>=</span><span> createRequest();
</span><span> 29</span>                 <span>if</span><span> (xmlhttp) {
</span><span> 30</span> <span>                    m$(</span><span>'</span><span>loading</span><span>'</span><span>).innerHTML </span><span>=</span> <span>"</span><span><font color='red'>loading...</font></span><span>"</span><span>;
</span><span> 31</span>                     <span>var</span><span> username </span><span>=</span><span> m$(</span><span>'</span><span>username</span><span>'</span><span>).value;
</span><span> 32</span>                     <span>var</span><span> pwd </span><span>=</span><span> m$(</span><span>'</span><span>password</span><span>'</span><span>).value;
</span><span> 33</span>                     <span>var</span><span> code </span><span>=</span><span> m$(</span><span>'</span><span>txtCode</span><span>'</span><span>).value;
</span><span> 34</span>                     <span>var</span><span> url </span><span>=</span> <span>"</span><span>dologin.php</span><span>"</span><span>;
</span><span> 35</span> <span>                    xmlhttp.open(</span><span>"</span><span>POST</span><span>"</span><span>, url, </span><span>true</span><span>);
</span><span> 36</span> <span>                    xmlhttp.onreadystatechange </span><span>=</span><span> ValidateResult;
</span><span> 37</span> <span>                    xmlhttp.setRequestHeader(</span><span>"</span><span>Content-Type</span><span>"</span><span>, </span><span>"</span><span>application/x-www-form-urlencoded</span><span>"</span><span>);
</span><span> 38</span> <span>                    xmlhttp.send(</span><span>"</span><span>username=</span><span>"</span> <span>+</span><span> escape(username) </span><span>+</span> <span>"</span><span>&password=</span><span>"</span> <span>+</span><span> escape(pwd) </span><span>+</span> <span>"</span><span>&code=</span><span>"</span> <span>+</span><span> escape(code));
</span><span> 39</span> 
<span> 40</span> <span>                } </span><span>else</span><span> {
</span><span> 41</span> <span>                    alert(</span><span>'</span><span>xmlHttp创建失败.</span><span>'</span><span>);
</span><span> 42</span> 
<span> 43</span> <span>                }
</span><span> 44</span> 
<span> 45</span>                 <span>function</span><span> ValidateResult() {
</span><span> 46</span>                     <span>if</span><span> (xmlhttp.readyState </span><span>==</span> <span>4</span><span>) {
</span><span> 47</span>                         <span>if</span><span> (xmlhttp.status </span><span>==</span> <span>200</span><span>) {
</span><span> 48</span>                             <span>if</span><span> (xmlhttp.responseText </span><span>!=</span> <span>""</span><span>) {
</span><span> 49</span> 
<span> 50</span>                                 <span>//</span><span>window.alert(xmlhttp.responseText);</span>
<span> 51</span>                                 <span>var</span><span> obj </span><span>=</span><span> eval(</span><span>"</span><span>(</span><span>"</span> <span>+</span><span> xmlhttp.responseText </span><span>+</span> <span>"</span><span>)</span><span>"</span><span>);
</span><span> 52</span>                                 <span>if</span><span> (obj.result </span><span>==</span> <span>true</span><span>) {
</span><span> 53</span> <span>                                    alert(</span><span>"</span><span>提示:</span><span>"</span> <span>+</span><span> obj.info);
</span><span> 54</span> <span>                                    window.location </span><span>=</span> <span>'</span><span>index.php</span><span>'</span><span>;
</span><span> 55</span> 
<span> 56</span> <span>                                } </span><span>else</span><span> {
</span><span> 57</span> <span>                                    alert(</span><span>"</span><span>错误:</span><span>"</span> <span>+</span><span> obj.info);
</span><span> 58</span> 
<span> 59</span> <span>                                }
</span><span> 60</span> <span>                            } </span><span>else</span><span> {
</span><span> 61</span> <span>                                window.alert(</span><span>"</span><span>从服务器获取失败</span><span>"</span><span>);
</span><span> 62</span> 
<span> 63</span> <span>                                window.location.reload();
</span><span> 64</span> <span>                            }
</span><span> 65</span> <span>                            m$(</span><span>'</span><span>loading</span><span>'</span><span>).innerHTML </span><span>=</span> <span>""</span><span>;
</span><span> 66</span> <span>                        }
</span><span> 67</span> <span>                    }
</span><span> 68</span> 
<span> 69</span> <span>                }
</span><span> 70</span> 
<span> 71</span> 
<span> 72</span> <span>            }
</span><span> 73</span> 
<span> 74</span> <span>        }
</span><span> 75</span> 
<span> 76</span>         <span>function</span><span> m$(id) {
</span><span> 77</span>             <span>return</span><span> document.getElementById(id);
</span><span> 78</span> <span>        }
</span><span> 79</span> 
<span> 80</span>         <span>function</span><span> changeCode() {
</span><span> 81</span>             <span>var</span><span> xmlhttp </span><span>=</span><span> createRequest();
</span><span> 82</span>             <span>if</span><span> (xmlhttp) {
</span><span> 83</span> <span>                m$(</span><span>'</span><span>loading</span><span>'</span><span>).innerHTML </span><span>=</span> <span>"</span><span><font color='red'>loading...</font></span><span>"</span><span>;
</span><span> 84</span>                 <span>var</span><span> dt </span><span>=</span> <span>new</span><span> Date().getTime();
</span><span> 85</span>                 <span>//</span><span> alert(dt);</span>
<span> 86</span>                 <span>var</span><span> url </span><span>=</span> <span>"</span><span>function/imagecode.php?dummay</span><span>"</span> <span>+</span><span> escape(dt);
</span><span> 87</span> <span>                xmlhttp.open(</span><span>"</span><span>GET</span><span>"</span><span>, url, </span><span>true</span><span>);
</span><span> 88</span> <span>                xmlhttp.onreadystatechange </span><span>=</span><span> ValidateResult;
</span><span> 89</span> <span>                xmlhttp.send(</span><span>null</span><span>);
</span><span> 90</span> 
<span> 91</span> <span>            } </span><span>else</span><span> {
</span><span> 92</span> <span>                alert(</span><span>'</span><span>xmlHttp创建失败.</span><span>'</span><span>);
</span><span> 93</span> 
<span> 94</span> <span>            }
</span><span> 95</span> 
<span> 96</span>             <span>function</span><span> ValidateResult() {
</span><span> 97</span>                 <span>if</span><span> (xmlhttp.readyState </span><span>==</span> <span>4</span><span>) {
</span><span> 98</span>                     <span>if</span><span> (xmlhttp.status </span><span>==</span> <span>200</span><span>) {
</span><span> 99</span>                         <span>var</span><span> dt </span><span>=</span> <span>new</span><span> Date().getTime();
</span><span>100</span>                         <span>var</span><span> url </span><span>=</span> <span>"</span><span>function/imagecode.php?dummay</span><span>"</span> <span>+</span><span> escape(dt);
</span><span>101</span> <span>                        m$(</span><span>'</span><span>imgCode</span><span>'</span><span>).src </span><span>=</span> <span>"</span><span>function/imagecode.php?dummay</span><span>"</span> <span>+</span><span> escape(dt);
</span><span>102</span> <span>                        m$(</span><span>'</span><span>loading</span><span>'</span><span>).innerHTML </span><span>=</span> <span>""</span><span>;
</span><span>103</span> <span>                    }
</span><span>104</span> <span>                }
</span><span>105</span> 
<span>106</span> <span>            }
</span><span>107</span> <span>        }
</span><span>108</span> 
<span>109</span>         <span>function</span><span> showTool() {
</span><span>110</span> <span>            $(</span><span>'</span><span>#divToolTip</span><span>'</span><span>).css(</span><span>"</span><span>display</span><span>"</span><span>, </span><span>"</span><span>block</span><span>"</span><span>);
</span><span>111</span> <span>        }
</span><span>112</span> 
<span>113</span>         <span>function</span><span> hideTool() {
</span><span>114</span> <span>            $(</span><span>'</span><span>#divToolTip</span><span>'</span><span>).css(</span><span>"</span><span>display</span><span>"</span><span>, </span><span>"</span><span>none</span><span>"</span><span>);
</span><span>115</span> <span>        }
</span><span>116</span> <span>        window.onload </span><span>=</span><span> initPage;
</span><span>117</span> 
<span>118</span>         <span>function</span><span> initPage() {
</span><span>119</span> <span>            $(</span><span>'</span><span>#divToolTip</span><span>'</span><span>).css(</span><span>"</span><span>display</span><span>"</span><span>, </span><span>"</span><span>none</span><span>"</span><span>);
</span><span>120</span> <span>        }
</span><span>121</span>     <span></</span><span>script</span><span>></span>
<span>122</span>   <span></</span><span>head</span><span>></span>
<span>123</span>   <span><</span><span>body</span><span>></span>
<span>124</span>     <span><</span><span>div </span><span>style</span><span>="background-color:#2A3F55; height:80px;"</span><span>></span>
<span>125</span>       
<span>126</span>     <span></</span><span>div</span><span>></span>
<span>127</span>     <span><</span><span>div </span><span>style</span><span>="min-height:500px;"</span><span>></span>
<span>128</span>       
<span>129</span>       <span><</span><span>div </span><span>class</span><span>="left"</span><span>></span>
<span>130</span>         
<span>131</span>         <span><</span><span>div </span><span>style</span><span>="margin:120px auto auto auto; height:300px; text-align:left"</span><span>></span>
<span>132</span>           <span><</span><span>div </span><span>style</span><span>="font-size:26px;color:#2A3F55; text-align:center;"</span><span>></span><span>Ajax PHP Demo System
</span><span>133</span>             <span><</span><span>img </span><span>src</span><span>="Images/appstorm-icon.png"</span><span> alt</span><span>="appcation storm image"</span><span> style</span><span>="position:relative;top:-18px; left:-12px;                                    vertical-align:middle; text-align:center;font-size:10px; width:65px; height:46px;"</span><span>/></span>
<span>134</span>           <span></</span><span>div</span><span>></span>
<span>135</span>           <span><</span><span>br</span><span>/></span>
<span>136</span>           <span><</span><span>hr </span><span>style</span><span>="border:dashed thin #2A3F55;width:70%; text-align:center;"</span><span>/></span>
<span>137</span>           <span><</span><span>div </span><span>style</span><span>="font-size:13px;color:#999999; margin:20px auto 0 auto; padding-left:200px;"</span><span>></span>
<span>138</span>             Author:<span><</span><span>a </span><span>href</span><span>="#"</span><span> onmousemove</span><span>="showTool();"</span><span> onmouseout</span><span>="hideTool();"</span><span>></span>wangming<span></</span><span>a</span><span>></span>
<span>139</span>           <span></</span><span>div</span><span>></span>
<span>140</span>           <span><</span><span>div </span><span>style</span><span>="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;"</span><span>></span>DateTime:2009-9-1<span></</span><span>div</span><span>></span>
<span>141</span>           <span><</span><span>div </span><span>style</span><span>="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;"</span><span>></span>Version:1.0.0<span></</span><span>div</span><span>></span>
<span>142</span>           <span><</span><span>div </span><span>style</span><span>="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;"</span><span>></span>Email:wangmingemail@163.com                   <span></</span><span>div</span><span>></span>
<span>143</span>           <span><</span><span>div </span><span>id</span><span>="divToolTip"</span><span>></span>
<span>144</span>             <span><</span><span>img </span><span>src</span><span>="Images/ming.jpg"</span><span> height</span><span>="86px;"</span><span>/></span>
<span>145</span>             <span><</span><span>span </span><span>class</span><span>="authordes"</span><span>></span>
<span>146</span>               <span><</span><span>br</span><span>/></span>
<span>147</span>               姓名:wangming<span><</span><span>br</span><span>/></span>
<span>148</span>               电商06-2<span><</span><span>br</span><span>/></span>
<span>149</span>             <span></</span><span>span</span><span>></span>
<span>150</span>             
<span>151</span>           <span></</span><span>div</span><span>></span>
<span>152</span>           
<span>153</span>         <span></</span><span>div</span><span>></span>
<span>154</span>         
<span>155</span>       <span></</span><span>div</span><span>></span>
<span>156</span>       
<span>157</span>       <span><</span><span>div </span><span>class</span><span>="right"</span><span>></span>
<span>158</span>         
<span>159</span>         <span><</span><span>form</span><span>></span>
<span>160</span>           <span><</span><span>br</span><span>/></span>
<span>161</span>           <span><</span><span>table </span><span>class</span><span>="flogin"</span><span>></span>
<span>162</span>             <span><</span><span>tr</span><span>></span>
<span>163</span>               <span><</span><span>td</span><span>></span>用户名:<span></</span><span>td</span><span>></span>
<span>164</span>               <span><</span><span>td</span><span>><</span><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="username"</span><span> id</span><span>="username"</span><span>/></</span><span>td</span><span>></span>
<span>165</span>               <span><</span><span>td</span><span>></</span><span>td</span><span>></span>
<span>166</span>             <span></</span><span>tr</span><span>></span>
<span>167</span>             <span><</span><span>tr</span><span>></span>
<span>168</span>               <span><</span><span>td</span><span>></span>密<span>   </span>码:<span></</span><span>td</span><span>></span>
<span>169</span>               <span><</span><span>td</span><span>><</span><span>input </span><span>type</span><span>="password"</span><span> name</span><span>="password"</span><span> id</span><span>="password"</span> <span>/></</span><span>td</span><span>></span>
<span>170</span>               <span><</span><span>td</span><span>></</span><span>td</span><span>></span>
<span>171</span>             <span></</span><span>tr</span><span>></span>
<span>172</span>             <span><</span><span>tr</span><span>></span>
<span>173</span>               <span><</span><span>td</span><span>></span>验证码:<span></</span><span>td</span><span>></span>
<span>174</span>               <span><</span><span>td</span><span>></span>
<span>175</span>                 <span><</span><span>input </span><span>type</span><span>="text"</span><span> name</span><span>="txtCode"</span><span> id</span><span>="txtCode"</span><span> size</span><span>="12"</span> <span>/></span><span> </span>
<span>176</span>                 <span><</span><span>img </span><span>src</span><span>="function/imagecode.php"</span><span> id</span><span>="imgCode"</span><span> alt</span><span>="image code"</span><span> height</span><span>="22px;"</span><span> style</span><span>=" vertical-align:bottom;"</span><span>/></span>
<span>177</span>               <span></</span><span>td</span><span>></span>
<span>178</span>               <span><</span><span>td</span><span>><</span><span>input </span><span>type</span><span>="button"</span><span>  class</span><span>="btnrefresh"</span><span> onclick</span><span>="changeCode();"</span> <span>/></</span><span>td</span><span>></span>
<span>179</span>             <span></</span><span>tr</span><span>></span>
<span>180</span>             <span><</span><span>tr</span><span>></span>
<span>181</span>               <span><</span><span>td</span><span>></</span><span>td</span><span>></span>
<span>182</span>               <span><</span><span>td</span><span>><</span><span>input </span><span>type</span><span>="button"</span><span>  class</span><span>="btnlogin"</span><span> onclick</span><span>="chkForm();"</span> <span>/></</span><span>td</span><span>></span>
<span>183</span>               <span><</span><span>td</span><span>></</span><span>td</span><span>></span>
<span>184</span>             <span></</span><span>tr</span><span>></span>
<span>185</span>             <span><</span><span>tr</span><span>></span>
<span>186</span>               <span><</span><span>td</span><span>></</span><span>td</span><span>></span>
<span>187</span>               <span><</span><span>td</span><span>><</span><span>span </span><span>id</span><span>="loading"</span><span>></</span><span>span</span><span>></</span><span>td</span><span>></span>
<span>188</span>               <span><</span><span>td</span><span>><</span><span>span </span><span>id</span><span>="code"</span><span>></</span><span>span</span><span>></</span><span>td</span><span>></span>
<span>189</span>             <span></</span><span>tr</span><span>></span>
<span>190</span>             
<span>191</span>           <span></</span><span>table</span><span>></span>
<span>192</span>         <span></</span><span>form</span><span>></span>
<span>193</span>       <span></</span><span>div</span><span>></span>
<span>194</span>       
<span>195</span>     <span></</span><span>div</span><span>></span>
<span>196</span>     <span><</span><span>div </span><span>style</span><span>="background-color:#2A3F55; height:60px; margin:auto 0 0 0; clear:both; text-align:center; line-height:60px; color:#FFFFFF;font-size:12px;"</span><span>></span>
<span>197</span>       <span>&copy;</span><span>Copyright 2015.
</span><span>198</span>     <span></</span><span>div</span><span>></span>
<span>199</span>   <span></</span><span>body</span><span>></span>
<span>200</span> <span></</span><span>html</span><span>></span></span>

2 ajaxhelper.js

<span><span> 1</span> <span>function</span><span> createRequest() {
</span><span> 2</span>     <span>try</span><span> {
</span><span> 3</span>         request = <span>new</span><span> XMLHttpRequest();
</span><span> 4</span>     } <span>catch</span><span> (tryMS) {
</span><span> 5</span>         <span>try</span><span> {
</span><span> 6</span>             request = <span>new</span> ActiveXObject("Msxml2.XMLHTTP"<span>);
</span><span> 7</span>         } <span>catch</span><span> (otherMS) {
</span><span> 8</span>             <span>try</span><span> {
</span><span> 9</span>                 request = <span>new</span> ActiveXObject("Microsoft.XMLHTTP"<span>);
</span><span>10</span>             } <span>catch</span><span> (failed) {
</span><span>11</span>                 request = <span>null</span><span>;
</span><span>12</span> <span>            }
</span><span>13</span> <span>        }
</span><span>14</span> <span>    }
</span><span>15</span>     <span>return</span><span> request;
</span><span>16</span> <span>}
</span><span>17</span> 
<span>18</span> <span>function</span><span> getActivatedObject(e) {
</span><span>19</span>     <span>var</span><span> obj;
</span><span>20</span>     <span>if</span> (!<span>e) {
</span><span>21</span>         <span>//</span><span> early version of IE</span>
<span>22</span>         obj =<span> window.event.srcElement;
</span><span>23</span>     } <span>else</span> <span>if</span><span> (e.srcElement) {
</span><span>24</span>         <span>//</span><span> IE 7 or later</span>
<span>25</span>         obj =<span> e.srcElement;
</span><span>26</span>     } <span>else</span><span> {
</span><span>27</span>         <span>//</span><span> DOM Level 2 browser</span>
<span>28</span>         obj =<span> e.target;
</span><span>29</span> <span>    }
</span><span>30</span>     <span>return</span><span> obj;
</span><span>31</span> <span>}
</span><span>32</span> 
<span>33</span> <span>function</span><span> addEventHandler(obj, eventName, handler) {
</span><span>34</span>     <span>if</span><span> (document.attachEvent) {
</span><span>35</span>         obj.attachEvent("on" +<span> eventName, handler);
</span><span>36</span>     } <span>else</span> <span>if</span><span> (document.addEventListener) {
</span><span>37</span>         obj.addEventListener(eventName, handler, <span>false</span><span>);
</span><span>38</span> <span>    }
</span><span>39</span> }</span>

3 dologin.php

<span><span> 1</span> <?<span>php
</span><span> 2</span>     <span>session_start</span><span>();
</span><span> 3</span>     <span>header</span>("Content-type:text/html;charset=gb2312");<span>//</span><span>防止返回的中文乱码</span>
<span> 4</span>     <span>$name</span>=<span>$_POST</span>['username'<span>];
</span><span> 5</span>     <span>$pwd</span>=<span>$_POST</span>['password'<span>];
</span><span> 6</span>     <span>$imagecode</span>=<span>$_POST</span>['code'<span>];
</span><span> 7</span>     <span>if</span>(<span>strtoupper</span>(<span>$imagecode</span>)==<span>$_SESSION</span>["code"<span>])
</span><span> 8</span> <span>    {
</span><span> 9</span>        <span>include</span>("conn/conn.php"<span>);
</span><span>10</span>        <span>$sql</span>="select studentName,studentPwd from tbstudent where studentId='".<span>$name</span>."'"<span>;
</span><span>11</span>        <span>$result</span>=<span>mysql_query</span>(<span>$sql</span>,<span>$conn</span><span>);
</span><span>12</span>        <span>if</span>(<span>$row</span>=<span>mysql_fetch_assoc</span>(<span>$result</span><span>))
</span><span>13</span> <span>       {
</span><span>14</span>          <span>if</span>(<span>$pwd</span>==<span>$row</span>['studentPwd'<span>])
</span><span>15</span> <span>         {
</span><span>16</span>           <span>$_SESSION</span>['username']=<span>$row</span>['studentName'<span>];
</span><span>17</span>             <span>//</span><span>echo "{'result':true,'info':'登陆成功!','code':'".$_SESSION["code"]."'}";</span>
<span>18</span>             <span>echo</span> "{'result':true,'info':'登陆成功!'}"<span>;
</span><span>19</span>          
<span>20</span> <span>         }
</span><span>21</span>          <span>else</span>
<span>22</span> <span>         {
</span><span>23</span>             <span>echo</span> "{'result':false,'info':'密码错误!'}"<span>;
</span><span>24</span> <span>         }
</span><span>25</span> <span>       }
</span><span>26</span>       <span>else</span>
<span>27</span> <span>      {
</span><span>28</span>           <span>echo</span> "{'result':false,'info':'该用户不存在!'}"<span>;
</span><span>29</span> <span>      }
</span><span>30</span> <span>   }
</span><span>31</span>    <span>else</span>
<span>32</span> <span>   {
</span><span>33</span>        <span>echo</span> "{'result':false,'info':'验证码错误!'}"<span>;
</span><span>34</span> <span>   }
</span><span>35</span> ?></span>

 4 conn.php

<span><span>1</span> <?<span>php
</span><span>2</span>  <span>$conn</span>=<span>$mysql_connect</span>("localhost","root", ""<span>);
</span><span>3</span>  <span>mysql_select_db</span>("bbs",<span>$conn</span><span>);
</span><span>4</span>  <span>mysql_query</span>("SET NAMES GB2312"<span>);
</span><span>5</span> ?></span>

5 user.php

1 php 2 class Users { 3 function Users() { 4 } 5 function checkLogin($username, $userpwd) { 6 try { 7 mysql_connect("localhost", "root", "123"); 8 mysql_select_db("studentdb"); 9 mysql_query("SET NAMES GB2312"); 10 $sql = "select userid from tbuser where username='$username' and userpwd='" . md5(trim($userpwd)) . "'"; 11 $result = mysql_query($sql); 12 if ($result) { 13 $arr = mysql_fetch_row($result); 14 $uid = $arr[0]; 15 if ($uid != "") { 16 return "true|$uid login ok.$sql"; 17 mysql_close(); 18 } else { 19 return "false|login failed!$sql"; 20 mysql_close(); 21 } 22 } else { 23 return "false|$result link db failed!"; 24 mysql_close(); 25 } 26 } 27 catch(Exception $ex) { 28 return "false|$ex"; 29 mysql_close(); 30 } 31 } 32 function AddUser($name, $pwd) { 33 try { 34 mysql_connect("localhost", "root", "123"); 35 mysql_select_db("studentdb"); 36 mysql_query("set names gb2312"); 37 $sql0 = mysql_query("select userid from tbuser where username='$name'"); 38 $info0 = mysql_fetch_array($sql0); 39 $userid = $info0[0]; 40 if ($info0 != false) { 41 return "false | $name is exisis.(id:$userid)"; 42 } 43 $pwd = md5(trim($pwd)); 44 $query = mysql_query("insert into tbuser(username,userpwd)values('$name','$pwd')"); 45 $error = mysql_errno(); 46 if ($query) { 47 return "true | add ok"; 48 } else { 49 return "false | $error"; 50 } 51 } 52 catch(Exception $ex) { 53 return "false | $ex"; 54 } 55 } 56 function DeleteUser($name) { 57 mysql_connect("localhost", "root", "123"); 58 mysql_select_db("studentdb"); 59 mysql_query("set names gb2312"); 60 $name = trim($name); 61 $sql0 = mysql_query("select userid from tbuser where username='$name'"); 62 $info0 = mysql_fetch_array($sql0); 63 if ($info0 != false) { 64 if (mysql_query("delete from tbuser where username='$name'")) { 65 return "true | delete ok.(id:" . $info0[0] . ")"; 66 } else { 67 return "false | 删除失败"; 68 } 69 } else { 70 return "false | 删除失败 $name 不存在"; 71 } 72 } 73 function UpdateUser($id, $name, $pwd) { 74 if (is_numeric(intval(trim($id)))) { 75 if ($id && $name && $pwd) { 76 mysql_connect("localhost", "root", "123"); 77 mysql_select_db("studentdb"); 78 mysql_query("set names gb2312"); 79 $pwd = md5(trim($pwd)); 80 $isexists = mysql_query("select * from tbuser where userid='$id'"); 81 if (mysql_fetch_array($isexists)) { 82 $sql0 = mysql_query("update tbuser set username='$name',userpwd='$pwd' where userid= $id"); 83 if ($sql0) { 84 return "ture | update ok"; 85 } else { 86 return "false | 更新失败"; 87 } 88 } else { 89 return "false | usrid=$id not exists."; 90 } 91 } else { 92 return "false |id=$id name=$name and pwd=$pwd .At least one of them is null."; 93 } 94 } else { 95 return "false | $id is not type of int."; 96 } 97 } 98 } 99 ?> View Code

与登录无关,只为了记录一下PHP如何在数据库MYSQL上实现CURD操作.

6 效果图

 

http://www.bkjia.com/PHPjc/1073807.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/1073807.htmlTechArticleAjax+PHP+MySQL 登陆示例， PHP是一门很好的语言,可以很方便的开发web应用程序,下面介绍一下PHP如何通过AJAX方式实现登录功能: 1 login.php 登录界...