3v4l.org

run code in 300+ PHP versions simultaneously
<?php if ( ! defined('PHP_EOL')) { define('PHP_EOL', "\n"); } $array = array('a' => false, 'b' => null, 'c' => '', 'd' => true); function asBool($value) { return $value ? 'true' : 'false' ; } foreach ($array as $k => $v) { printf( '"%s" => "%s" isset = %s ake = %s' . PHP_EOL, $k, $v, asBool(isset($array[ $k ])), asBool(array_key_exists($k, $array)) ); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
"a" => "" isset = true ake = true "b" => "" isset = false ake = true "c" => "" isset = true ake = true "d" => "1" isset = true ake = true
preferences:
278.75 ms | 406 KiB | 461 Q