PHP获取文件扩展名的常用方法小结php技巧

function getExt1($filename)
{
   $arr = explode('.',$filename);
   return array_pop($arr);;
}

function getExt2($filename)
{
   $ext = strrchr($filename,'.');
   return $ext;
}

function getExt3($filename)
{
   $pos = strrpos($filename, '.');
   $ext = substr($filename, $pos);
   return $ext;
}

function getExt4($filename)
{
   $arr = pathinfo($filename);
   $ext = $arr['extension'];
   return $ext;
}

function getExt5($filename)
{
   $str = strrev($filename);
   return strrev(strchr($str,'.',true));
}