<!DOCTYPE html>
<html>
<body>
<?php
$strings = ["apple", "orange", "banana", "coconut"];
$lengths = array_map( function($item) { return strlen($item); } , $strings);
print_r($lengths);
?>
</body>
</html>
Array ( [0] => 5 [1] => 6 [2] => 6 [3] => 7 )