PHP獲取文件后綴名的幾種方法1： 
function get_file_type($filename){ 
$type = substr($filename, strrpos($filename, ".")+1); 
return $type; 
} 
PHP獲取文件后綴名的幾種方法2： 
function get_file_type($filename) 
{ 
$type = pathinfo($filename); 
$type = strtolower($type["extension"]); 
return $type; 
} 
PHP獲取文件后綴名的幾種方法3： 
function get_file_type($filename) 
{ 
$type =explode("." , $filename); 
$count=count($type)-1; 
return $type[$count]; 
} 
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