<?php $a = [ 0 => [ 'price' => 5.5 ], 1 => [ 'price' => 6.0 ], 2 => [ 'price' => 6.2 ], 3 => [ 'price' => 6.5 ], ]; $b = [ 0 => [ 'color' => 'RED' ], 1 => [ 'color' => 'WHITE' ], 2 => [ 'color' => 'BLUE' ], 3 => [ 'color' => 'RED' ], ]; print_r(array_replace_recursive($a, $b));
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