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Three efficient functions to obtain PHP file extension_PHP Tutorial
- WBOYOriginal
- 2016-07-13 17:40:11831browse
方法一：
function extend_1($file_name)
{
$retval="";
$pt=strrpos($file_name, ".");
if ($pt) $retval=substr($file_name, $pt 1, strlen($file_name) - $pt);
return ($retval);
}
?>
方法二：
function extend_2($file_name)
{
$extend = pathinfo($file_name);
$extend = strtolower($extend["extension"]);
return $extend;
}
方法三：
function extend_3($file_name)
{
$extend =explode("." , $file_name);
$va=count($extend)-1;
return $extend[$va];
}
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