How to remove file name suffix in php

php How to remove the suffix of a file name: First create a PHP sample file; then specify a file name; finally remove the suffix of the specified file name through functions such as "str_replace".

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php remove file name suffix (extension):

<?php 
$filename="help.php"; 
$filename=str_replace(strrchr($filename, "."),"",$filename); 
echo $filename; 
?>

Output:

help

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