remove everything after a string in php code example

Example 1: php remove text from string

<?php
  //Replace the characters "world" in the string "Hello world!" with "Peter":
echo str_replace("world","Peter","Hello world!");
?>

Example 2: php remove everything after character

$fullpath = 'folderName/file.ext';
$folder = substr($fullpath, 0, strpos($fullpath, '/'));
echo $folder;
// Output => folderName