3v4l.org

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<?php $sources = [0=>0, 1=>1, 2=>2, 3=>3]; print_r($sources); foreach($sources as $k => $source){ print_r([$k, $source]); }
Output for 8.5.1
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 ) Array ( [0] => 0 [1] => 0 ) Array ( [0] => 1 [1] => 1 ) Array ( [0] => 2 [1] => 2 ) Array ( [0] => 3 [1] => 3 )
preferences:
38.66 ms | 481 KiB | 3 Q