- array_merge: documentation ( source)
- array_values: documentation ( source)
- str_replace: documentation ( source)
- array_keys: documentation ( source)
- range: documentation ( source)
<?php
$string = 'abed';
function convert_to_int($string) {;
$characters = array_merge([' '], range('a', 'z'));
return str_replace(array_values($characters), array_keys($characters), $string);
}
echo convert_to_int('abed');
echo "\n";
echo convert_to_int('abed 5');