How to convert two-dimensional array to one-dimensional array in PHP

This article mainly shares with you the method of converting PHP two-dimensional array into one-dimensional array. It is mainly shared with you in the form of code. I hope it can help you.

$arr = [ 'a' => [ 1, 2, ], 'b' => [ '3', '4'=>[ '5' ] ], 'b' ];

print_r(iterator_to_array( new RecursiveIteratorIterator( new RecursiveArrayIterator($arr) ), false ) );

Result:

Array ([0] => 1 [1] => 2 [2] => 3 [3] => 5 [4 ] => b )

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