php处理图片
- WBOY原创
- 2016-06-06 19:46:012058浏览
这段时间好浮躁，不知道该从哪下手了。想学这个又觉得现在最缺那个，学了这个现在要用到那个。不知道走左边还是右边了，虽然都能到目的地。 这是图片处理的笔记。只是个人笔记，没有细细研究，并且有个小错误。 1 ? php 2 header ("content-type:text/html;
这段时间好浮躁，不知道该从哪下手了。想学这个又觉得现在最缺那个，学了这个现在要用到那个。不知道走左边还是右边了，虽然都能到目的地。
这是图片处理的笔记。只是个人笔记，没有细细研究，并且有个小错误。
<span> 1</span> <span>php
</span><span> 2</span> <span>header</span>("content-type:text/html; charset=utf-8"<span>);
</span><span> 3</span> <span>error_reporting</span>(<span>E_ERROR</span> | <span>E_WARNING</span> | <span>E_PARSE</span><span>);
</span><span> 4</span> <span>function</span> echoHtml(<span>$title</span>, <span>$info</span> = '', <span>$content</span> = <span>array</span>(), <span>$tip</span> = ''<span>)
</span><span> 5</span> <span>{
</span><span> 6</span> <span>$html</span> = ''<span>;
</span><span> 7</span> <span>$html</span> .= '<h3>'.<span>$title</span>.'</h3>'<span>;
</span><span> 8</span> <span>if</span>(<span>$info</span><span>)
</span><span> 9</span> <span> {
</span><span> 10</span> <span>$html</span> .= "<p>{<span>$info</span>}</p>"<span>;
</span><span> 11</span> <span> }
</span><span> 12</span> <span>if</span>(<span>is_array</span>(<span>$content</span>) && !<span>empty</span>(<span>$content</span><span>))
</span><span> 13</span> <span> {
</span><span> 14</span> <span>foreach</span> (<span>$content</span> <span>as</span> <span>$key</span> => <span>$row</span><span>)
</span><span> 15</span> <span> {
</span><span> 16</span> <span>$i</span> = <span>$key</span>+1<span>;
</span><span> 17</span> <span>$html</span> .= "<p>\t{<span>$i</span>}：\t{<span>$row</span>}</p>"<span>;
</span><span> 18</span> <span> }
</span><span> 19</span> <span> }
</span><span> 20</span> <span>if</span>(<span>$tip</span><span>)
</span><span> 21</span> <span> {
</span><span> 22</span> <span>$html</span> .= "<p><b>\tTIP：{<span>$tip</span>}</b></p>"<span>;
</span><span> 23</span> <span> }
</span><span> 24</span> <span>$html</span> .= "<hr><br>"<span>;
</span><span> 25</span> <span>echo</span> <span>$html</span><span>;
</span><span> 26</span> <span>}
</span><span> 27</span> <span>/*</span><span>*
</span><span> 28</span> <span> * 生成缩略图
</span><span> 29</span> <span> * @param $src_img 操作图片文件名
</span><span> 30</span> <span> * @param $new_img 新的图片文件名
</span><span> 31</span> <span> * @param $n_w 宽度
</span><span> 32</span> <span> * @param $n_h 高度
</span><span> 33</span> <span> * @return resouce
</span><span> 34</span> <span> * @author cntnn11
</span><span> 35</span> <span> * @date 2013-03-10
</span><span> 36</span> <span>*/</span>
<span> 37</span> <span>function</span> thumb(<span>$src_img</span>, <span>$new_img</span>, <span>$n_w</span> = 0, <span>$n_h</span> = 0<span>)
</span><span> 38</span> <span>{
</span><span> 39</span> <span>if</span>(<span>is_file</span>(<span>$src_img</span><span>))
</span><span> 40</span> <span> {
</span><span> 41</span> <span>list</span>(<span>$s_w</span>, <span>$w_h</span>, <span>$s_t</span>) = <span>getimagesize</span>(<span>$src_img</span><span>);
</span><span> 42</span>
<span> 43</span> <span>//</span><span>对心图片的宽高进行等比缩放限制，使用固定的公式
</span><span> 44</span> <span> //缩放以原始图片最大的边做为新图片最大的尺寸，另一边则根据以下公式进行等比缩放
</span><span> 45</span> <span> //如果原图的宽度小于高度，那么重新计算新图的宽度，否则重新计算新图的高度</span>
<span> 46</span> <span>if</span>(<span>$n_w</span> && (<span>$s_w</span> $s_h<span>))
</span><span> 47</span> <span> {
</span><span> 48</span> <span>$n_w</span> = (<span>$n_h</span> / <span>$s_h</span>) * <span>$s_h</span><span>;
</span><span> 49</span> <span> }
</span><span> 50</span> <span>else</span>
<span> 51</span> <span> {
</span><span> 52</span> <span>$n_h</span> = (<span>$n_w</span> / <span>$s_w</span>) * <span>$s_w</span><span>;
</span><span> 53</span> <span> }
</span><span> 54</span>
<span> 55</span> <span>//</span><span>开始生成</span>
<span> 56</span> <span>$res_img_new</span> = imagecreatetruecolor(<span>$n_w</span>, <span>$n_h</span><span>);
</span><span> 57</span> <span>switch</span>(<span>$s_t</span><span>)
</span><span> 58</span> <span> {
</span><span> 59</span> <span>case</span> 1:
<span> 60</span> <span>$res_img</span> = imagecreatefromgif(<span>$src_img</span><span>);
</span><span> 61</span> <span>$ext</span> = 'gif'<span>;
</span><span> 62</span> <span>break</span><span>;
</span><span> 63</span> <span>case</span> 2:
<span> 64</span> <span>$res_img</span> = imagecreatefromjpeg(<span>$src_img</span><span>);
</span><span> 65</span> <span>$ext</span> = 'jpg'<span>;
</span><span> 66</span> <span>break</span><span>;
</span><span> 67</span> <span>case</span> 3:
<span> 68</span> <span>$res_img</span> = imagecreatefrompng(<span>$src_img</span><span>);
</span><span> 69</span> <span>$ext</span> = 'png'<span>;
</span><span> 70</span> <span>break</span><span>;
</span><span> 71</span> <span>default</span>:
<span> 72</span> <span>echo</span> '不支持的图片类型'<span>;
</span><span> 73</span> <span>return</span> <span>false</span><span>;
</span><span> 74</span> <span>break</span><span>;
</span><span> 75</span> <span> }
</span><span> 76</span>
<span> 77</span> imagecopyresampled(<span>$res_img_new</span>, <span>$res_img</span>, 0, 0, 0, 0, <span>$n_w</span>, <span>$n_h</span>, <span>$s_w</span>, <span>$s_h</span><span>);
</span><span> 78</span> <span>//</span><span>$res_img_new = imagecreate($n_w, $n_h);
</span><span> 79</span> <span> //imagecopyresized($res_img_new, $res_img, 0, 0, 0, 0, $n_w, $n_h, $s_w, $s_h);</span>
<span> 80</span> <span>global</span> <span>$img_new_dir</span><span>;
</span><span> 81</span> <span>$new_img_file</span> = <span>$img_new_dir</span>.<span>$new_img</span>.'.'.<span>$ext</span><span>;
</span><span> 82</span> imagejpeg(<span>$res_img_new</span>, <span>$new_img_file</span><span>);
</span><span> 83</span> <span>//</span><span>genImage($res_img_new, $new_img_file, $s_t);</span>
<span> 84</span> imagedestroy(<span>$res_img</span><span>);
</span><span> 85</span> imagedestroy(<span>$res_img_new</span><span>);
</span><span> 86</span> <span>echo</span> '缩放后的图片：'<span>;
</span><span> 87</span> <span>echo</span> '<img src="'.<span>%24new_img_file</span>.'" alt="生成的缩略图"><hr><br>'<span>;
</span><span> 88</span> <span> }
</span><span> 89</span> <span>}
</span><span> 90</span> <span>/*</span><span>*
</span><span> 91</span> <span> * 接收传入参数生成一张图片
</span><span> 92</span> <span> * @param $img_res 处理好的图片资源
</span><span> 93</span> <span> * @param $img_file 新的图片地址
</span><span> 94</span> <span> * @param $img_type 图片类型
</span><span> 95</span> <span> * @return resouce
</span><span> 96</span> <span> * @author cntnn11
</span><span> 97</span> <span> * @date 2013-03-10
</span><span> 98</span> <span>*/</span>
<span> 99</span> <span>function</span> genImage(<span>$img_res</span>, <span>$img_file</span>, <span>$img_type</span> = 2<span>)
</span><span>100</span> <span>{
</span><span>101</span> <span>switch</span>(<span>$img_type</span><span>)
</span><span>102</span> <span> {
</span><span>103</span> <span>case</span> 1:
<span>104</span> <span>return</span> imagegif(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>105</span> <span>break</span><span>;
</span><span>106</span> <span>case</span> 2:
<span>107</span> <span>return</span> imagejpeg(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>108</span> <span>break</span><span>;
</span><span>109</span> <span>case</span> 3:
<span>110</span> <span>return</span> imagepng(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>111</span> <span>break</span><span>;
</span><span>112</span> <span>default</span>:
<span>113</span> <span>return</span> '不支持的图片类型'<span>;
</span><span>114</span> <span>break</span><span>;
</span><span>115</span> <span> }
</span><span>116</span> <span>}
</span><span>117</span>
<span>118</span> <span>/*</span><span>==============================================================================================================================</span><span>*/</span>
<span>119</span> <span>global</span> <span>$img_name</span>,<span>$img_new_dir</span><span>;
</span><span>120</span> <span>$img_name</span> = 'testimg.jpg'<span>;
</span><span>121</span> <span>$img_new_dir</span> = 'genimages/'<span>;
</span><span>122</span>
<span>123</span> <span>echo</span> "<p>原始测试图片：‘{<span>$img_name</span>}’</p>"<span>;
</span><span>124</span> <span>echo</span> '<img src="'.<span>%24img_name</span>.'" alt="测试图片" style="max-width:90%">'<span>;
</span><span>125</span>
<span>126</span>
<span>127</span> <span>//</span><span>获取图片资源，在此使用jpg格式做测试图片</span>
<span>128</span> <span>$img_sour</span> = imagecreatefromjpeg('testimg.jpg'<span>);
</span><span>129</span>
<span>130</span> <span>//</span><span>图片宽高的获取</span>
<span>131</span> <span>$title</span> = "图片宽高度获取"<span>;
</span><span>132</span> <span>$info</span> = "涉及使用函数imagesx(img source) imagesy(img source)"<span>;
</span><span>133</span> <span>$content</span>= <span>array</span><span>(
</span><span>134</span> 'imagesx(image)：传入一个通过imagecreate_()函数创建的图片资源类型做为参数，返回宽度',
<span>135</span> 'imagesy(image)：同imagesx，返回高度！',
<span>136</span> '测试图片的原始宽度：'.imagesx(<span>$img_sour</span>).'px 原始高度：'.imagesy(<span>$img_sour</span>).'px',
<span>137</span> <span>);
</span><span>138</span> <span>$tip</span> = "这两个函数的参数必须是图片资源类型！！"<span>;
</span><span>139</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>140</span>
<span>141</span> <span>//</span><span>另一种获取图片属性的方法</span>
<span>142</span> <span>$title</span> = "使用getimagesize(图片名);获取图片的属性"<span>;
</span><span>143</span> <span>$info</span> = "该函数返回一个数组，包含了宽度、高度、图片类型信息！只需接收一个文件名即可获取！"<span>;
</span><span>144</span> <span>$content</span>= <span>array</span><span>(
</span><span>145</span> '使用方式：getimagesize('.<span>$img_name</span>.')',
<span>146</span> '返回一个数组：下标0表示宽度，下标1表示高度，下标2表示图片类型',
<span>147</span> ' 图片类型说明：1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM',
<span>148</span> '下标从3开始的则为文本类型，可以说是对0、1、2三个下标值的说明',
<span>149</span> <span>);
</span><span>150</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>151</span>
<span>152</span> <span>//</span><span>图片缩放函数</span>
<span>153</span> <span>$title</span> = "图片缩放，使用效果更好的imagecopyresampled()函数"<span>;
</span><span>154</span> <span>$info</span> = "主要学习等比缩放，因为不对宽高进行约束，那么新生成的图片会变形"<span>;
</span><span>155</span> <span>$content</span>= <span>array</span><span>(
</span><span>156</span> 'imagecopyresampled(dst_image, src_image, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h)',
<span>157</span> '参数说明：',
<span>158</span> ' dst_image【新图片】 图片资源类型',
<span>159</span> ' src_image【要缩略的原始图片】 图片资源类型',
<span>160</span> ' dst_x,dst_y,dst_w,dst_h【缩略图片的X轴起点，y轴起点，宽度和高度】 数值类型',
<span>161</span> ' src_x,src_y,src_w,src_h【原始图片的X轴起点，y轴起点，宽度和高度】 数值类型',
<span>162</span> <span>);
</span><span>163</span> <span>$tip</span> = "还有一个imagecopyresized()的函数，参数同imagecopyresampled()函数一致，但效果没有他好，不知道为什么？"<span>;
</span><span>164</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>165</span>
<span>166</span> <span>//</span><span>测试缩略方法</span>
<span>167</span> <span>$title</span> = '写一个thumb()方法，用来等比缩略一张图片'<span>;
</span><span>168</span> <span>$info</span> = '使用imagecopyresampled()函数来使用'<span>;
</span><span>169</span> <span>$content</span>= <span>array</span><span>(
</span><span>170</span> '首先确定参数：原始图片，缩略图片目标位置，缩略图片的宽度和高度',
<span>171</span> '获取图片的属性，宽高、类型，以创建相应的图片资源',
<span>172</span> '使用固定公式算出新图片等比缩放的宽高',
<span>173</span> '根据图片类型生成新的缩略图片',
<span>174</span> '释放图片资源',
<span>175</span> <span>);
</span><span>176</span> <span>$tip</span> = "生成了黑色的图片，需要解决！！！！！！！！！！！"<span>;
</span><span>177</span> echoHtml(<span>$titl</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>178</span> thumb(<span>$img_name</span>, 'suolve1', 500, 500<span>);
</span><span>179</span>
<span>180</span> <span>//</span><span>图片透明</span>
<span>181</span> <span>/*</span><span>imagecolortransparent()
</span><span>182</span> <span>imagecolorstotal()
</span><span>183</span> <span>imagecolorsforindex()
</span><span>184</span> <span>imagecolorallocate()
</span><span>185</span> <span>imagefill()</span><span>*/</span>
<span>186</span>
<span>187</span> imagedestroy(<span>$img_sour</span>);
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