3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ['1' => 'A', '2' => null, '3' => 0]; foreach (['1', '2', '3', '4'] as $test) { var_export(isset($array[$test]) ? $array[$test] : '-'); echo " , "; var_export(key_exists($test, $array) ? $array[$test] : '-'); echo " , "; var_export(array_key_exists($test, $array) ? $array[$test] : '-'); echo " , "; var_export($array[$test] ?? '-'); echo "\n"; }
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
'A' , 'A' , 'A' , 'A' '-' , NULL , NULL , '-' 0 , 0 , 0 , 0 '-' , '-' , '-' , '-'
preferences:
88.65 ms | 1247 KiB | 4 Q