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<?php $foo = ['foo' => 10]; $bar = ['foo' => 20]; var_dump(array_merge_recursive($foo, $bar)); var_dump(array_replace_recursive($foo, $bar)); $foo = ['foo' => ['bar' => 10]]; $bar = ['foo' => ['bar' => 20]]; var_dump(array_merge_recursive($foo, $bar)); var_dump(array_replace_recursive($foo, $bar));