浅析PHP函数ereg()的具体使用方法
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>
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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