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run code in 500+ PHP versions simultaneously
<?php $a = array( 1 => array( 'test' => 3 ) ); $b = array( 1 => array( 'test2' => 3 ) ); $c = array_merge_recursive( $a, $b ); var_dump( $c );

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84.38 ms | 1804 KiB | 5 Q