3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array ( 0 => array ( $this => 3, // instead 0 => 3, 'name' => 'three', ), 1 => array ( $this => 5, // instead 0 => 5, 'name' => 'five', ), 2 => array ( $this => 7, // instead 0 => 7, 'name' => 'seven', ), ); print_r( $arr[0]);

preferences:
57.67 ms | 402 KiB | 5 Q