假设有这样一个表单:
<ol class="dp-xml"> <li class="alt"><span><span><form </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"form1"</font></span><span> </span><span class="attribute"><font color="#ff0000">id</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"form1"</font></span><span> </span><span class="attribute"><font color="#ff0000">method</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"post"</font></span><span> </span><span class="attribute"><font color="#ff0000">action</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"myphp.php"</font></span><span> </span><span class="attribute"><font color="#ff0000">onSubmit</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"return Checker()"</font></span><span>> </span></span></li> <li class=""> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"1"</font></span><span>>1<br> </span> </li> <li class="alt"> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"2"</font></span><span>>2<br> </span> </li> <li class=""> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"3"</font></span><span>>3<br> </span> </li> <li class="alt"> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"4"</font></span><span>>4<br> </span> </li> <li class=""> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"hidden"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"items"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">""</font></span><span>> </span> </li> <li class="alt"> <span><input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"Submit"</font></span><span>> </span> </li> <li class=""><span></form> </span></li> </ol>
这个PHP接收复选框信息的例子中的表单有四个名字都是item的复选框,当用户单击Submit按钮的时候,Checker函数会被调用,并且如果Checker返回true表单就被提交,返回false表单就不会被提交。这里Checker函数就是我们要编写的预处理函数。在HTML的header部分添加下面的javascript:
<ol class="dp-xml"> <li class="alt"><span><span><script </span><span class="attribute"><font color="#ff0000">language</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"javascript"</font></span><span>> </span></span></li> <li class=""><span><!-- </span></li> <li class="alt"><span>function Checker() </span></li> <li class=""><span>{ </span></li> <li class="alt"> <span> </span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">""</font></span><span>; </span> </li> <li class=""> <span> if ( !form1.item.length ) // 只有一个复选框,</span><span class="attribute"><font color="#ff0000">form1.item.length</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">undefined</font></span><span> </span> </li> <li class="alt"><span> { </span></li> <li class=""><span>if ( form1.items.checked ) </span></li> <li class="alt"> <span> </span><span class="attribute-value"><font color="#0000ff">form1</font></span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = form1.item.value; </span> </li> <li class=""><span> } </span></li> <li class="alt"><span> else </span></li> <li class=""><span> { </span></li> <li class="alt"> <span>for ( </span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">0</font></span><span> ; i < form1.item.length ; i++ ) </span> </li> <li class=""><span>{ </span></li> <li class="alt"><span> if ( form1.item(i).checked ) // 复选框中有选中的框 </span></li> <li class=""><span> { </span></li> <li class="alt"> <span></span><span class="attribute-value"><font color="#0000ff">form1</font></span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = form1.item(i).value; </span> </li> <li class=""> <span>for ( </span><span class="attribute"><font color="#ff0000">j</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">i</font></span><span> + 1 ; j < form1.item.length ; j++ ) </span> </li> <li class="alt"><span>{ </span></li> <li class=""><span> if ( form1.item(j).checked ) </span></li> <li class="alt"><span> { </span></li> <li class=""><span>form1.items.value += " "; //用空格做分割符 </span></li> <li class="alt"><span>form1.items.value += form1.item(j).value; </span></li> <li class=""><span> } </span></li> <li class="alt"><span>} </span></li> <li class=""><span>break; </span></li> <li class="alt"><span> } </span></li> <li class=""><span>} </span></li> <li class="alt"><span> } </span></li> <li class=""><span> return true; </span></li> <li class="alt"><span>} </span></li> <li class=""><span>--> </span></li> <li class="alt"><span></script> </span></li> </ol>
这样就PHP接收复选框信息可以把所有选中的复选框的value组合成为一个字符串数组,在myphp.php使用这样的语句:
就可以把这些选项分离出来成为数组。需要注意的是选项中的value不能包含分割符(这里是空格)。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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