What are the several ways to get extensions in php
php获取扩展名的几种方法,下面给大家一一介绍:
$file = ‘需要进行获取扩展名的文件.php’;
第一种,根据.拆分,获取最后一个元素的值
function getExt1{ return end(explode(".",$file);) }
第二种,获取最后一个点的位置,截取
function getExt2{ return substr($file,strrpos($file,'.')+1); }
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第三种,根据.拆分,获取最后一个元素的值
function getExt3($file){ return array_pop(explode(‘.’,$file)); }
第四种,pathinfo
function getExt5($file) { $arr = pathinfo($file); return $arr['extension']; //或者这样return pathinfo($file,PATHINFO_EXTENSION); }
第五种,正则,子模式
function getExt6($file){ preg_match("/(gif | jpg | png)$/",$file,$match); $match=$match[0]; }
第六种,正则反向引用
function getExt7($file){ $match=preg_replace("/.*\.(\w+)/" , "\\1" ,$file); echo $match; }
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