How to display file extension PHP file extension get function

Copy the code The code is as follows:

$file = "/home/lvyaozu/backup_20080115.txt";
for($i=1; $i < 6; $i++) {
$func = 'get_file_ext_' . $i;
var_dump($func($file));
}
function get_file_ext_1($file) {
return strtolower(trim(substr(strrchr($file, '.'), 1)));
}
function get_file_ext_2($file) {
return strtolower(trim(pathinfo($file, PATHINFO_EXTENSION)));
}
function get_file_ext_3($file) {
return strtolower(trim(substr($ file, strrpos($file, '.')+1)));
}
function get_file_ext_4($file) {
return strtolower(trim(array_pop(explode('.', $file))));
}
function get_file_ext_5($file) {
$tok = strtok($file, '.');
while($tok !== false) {
$return = $tok;
$tok = strtok('.') ;
}
return strtolower(trim($return));
}
?>
This article comes from CSDN blog. Please indicate the source when reprinting: http://blog.csdn.net/lvyaozu/archive/2009/06/03 /4237628.aspx

The above introduces how to display the file extension of the PHP file extension acquisition function, including how to display the file extension. I hope it will be helpful to friends who are interested in PHP tutorials.