3v4l.org

run code in 300+ PHP versions simultaneously
<?php $file_content = "Employees are employees_category MyEmployees kitEMPLOYEESMATCH"; $f = 'employees'; $r = 'vehicles'; $pattern = '~(' . implode( ')|(', [ preg_quote($f, '~'), preg_quote(ucfirst($f), '~'), preg_quote(strtoupper($f), '~') ] ) . ')~'; $lookup = [ 1 => $r, 2 => ucfirst($r), 3 => strtoupper($r) ]; var_export( preg_replace_callback( $pattern, fn($m) => $lookup[array_key_last($m)], $file_content ) );
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
'Vehicles are vehicles_category MyVehicles kitVEHICLESMATCH'
Output for 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /in/4JINR on line 25
Process exited with code 255.
preferences:
106.18 ms | 407 KiB | 5 Q