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浅析PHP函数ereg()的具体使用方法

Jun 13, 2016 am 11:07 AM
int php string Instructions specific function exist of grammar

在许多高级语言中,语法: int ereg(string pattern, string string, array [regs]);

返回值: 整数/数组

函数种类: 资料处理

PHP函数ereg()内容说明

本函数以 pattern 的规则来解析比对字符串 string。比对结果返回的值放在数组参数 regs 之中,regs[0] 内容就是原字符串 string、regs[1] 为第一个合乎规则的字符串、regs[2] 就是第二个合乎规则的字符串,余类推。若省略参数 regs,则只是单纯地比对,找到则返回值为 true。

PHP函数ereg()使用范例

简单例子:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>if (ereg("c","abcdef")){     <br>//说明:判断abcdef中是否含有字母c  </span></li>
<li class="alt"><span>     echo "通过";  </span></li>
<li><span>}else{  </span></li>
<li class="alt"><span>     echo "错误";  </span></li>
<li><span>}  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>
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下面这个PHP函数ereg()例子是对输入的 E-Mail 作简单的检查,检查使用者的 E-Mail 字符串是否有 @ 字符,在 @ 字符前有英文字母或数字,在之后有数节字符串,最后的小数点后只能有二个或三个英文字母。super@mail.wilson.gs就可以通过检查,super@mail.wilson就不能通过检查。

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>if (ereg("^[_.0-9a-z-]+@([0-9a-z]<br>[0-9a-z-]+.)+[a-z]{2,3}$",$email))</span></li>
<li><span> {  </span></li>
<li class="alt"><span>   echo "您的 E-Mail 通过初步检查";  </span></li>
<li><span>}  </span></li>
<li class="alt">
<span class="tag">?></span><span>   </span>
</li>
</ol>
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