filter_var() 验证邮箱、ip、url的格式 php
验证邮箱格式的正确与否;你的第一解决方法是什么呢?
不管你们怎 么[思] [考] 的;反正我首先想到的就是字符串查找看是否有@符号 ;
但是对于结尾的.com或者.net 亦或者.cn等等越来越多的域名验证感觉棘手;
直到了某一天认真的研究了filter_var()函数的参数;
我对以前走马观花式的阅读php文档表示深深的惭愧;
其实filter_var()第二个参数传FILTER_VALIDATE_EMAIL即可验证邮箱、略加整理就如下;
/** * 验证是否是邮箱 * @param string $email 邮箱 * @return boolean 是否是邮箱 */function is_email($email){ if(filter_var($email,FILTER_VALIDATE_EMAIL)){ return true; }else{ return false; }}var_dump(is_email('baijunyao@baijunyao.com'));// 打印 turevar_dump(is_email('baijunyao.com'));// 打印 false
经研究;这个函数验证邮箱的规则就是要有个@符号 ;然后@符号后面还要有个英文句号. ;
咦?看到baijunyao.com;那有木有一个可以验证url域名的函数?
恩;没错;有的;第二个参数传FILTER_VALIDATE_URL就是用来验证url的;
/** * 验证是否是url * @param string $url url * @return boolean 是否是url */function is_url($url){ if(filter_var($url,FILTER_VALIDATE_URL)){ return true; }else{ return false; }}var_dump(is_url('http://baijunyao.com'));// 打印 truevar_dump(is_url('baijunyao.com'));// 打印 falsevar_dump(is_url('http://a'));// 打印 true
根据打印的结果可知;判断是否是url的规则就是要有http:// 后边要跟一个字母数字即可;
当然;顺理成章;第二个参数传FILTER_VALIDATE_IP的时候就是验证是否是ip地址了;
filter_var很强大的样子;那传个FILTER_VALIDATE_PHONE 是不是就可以验证手机号了?
恩恩;;;da an是否定的;你想多了;
别看了;这是做文章封面图用的;

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