3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = range(1, 10); $prefix = 'foo'; var_export( array_combine( substr_replace($array, 'key', 0, 0), substr_replace($array, 'value', 0, 0) ) );
Output for 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
array ( 'key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3', 'key4' => 'value4', 'key5' => 'value5', 'key6' => 'value6', 'key7' => 'value7', 'key8' => 'value8', 'key9' => 'value9', 'key10' => 'value10', )
preferences:
69.39 ms | 1000 KiB | 4 Q