- Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
- array(1) { [1]=> string(5) "value" } array(1) { [0]=> int(1) }
<?php
$a = ['1' => 'value'];
$keys = array_keys($a);
var_dump($a);
var_dump($keys);