Php multi-digit combination

The first choice is to explain that this article is somewhat suspected of a title party. I have previously written an article to compare the three methods for php to merge one-dimensional arrays, later, I used these three methods to process multi-dimensional arrays. The strange thing is that neither array_merge nor ++ reported an error. I thought they could also be used to process multi-dimensional arrays. After carefully observing the results, we found that the two methods are actually

The first choice is to explain that this article is somewhat suspected of a title party. I have previously written an article to compare the three methods for php to merge one-dimensional arrays, later, I used these three methods to process multi-dimensional arrays. The strange thing is that neither array_merge nor ++ reported an error. I thought they could also be used to process multi-dimensional arrays. After carefully observing the results, we found that the two methods are actually

The first choice is to explain that this article is somewhat suspected of a title party. I have previously written an article to compare the three methods for php to merge one-dimensional arrays, later, I used these three methods to process multi-dimensional arrays. The strange thing is that neither array_merge nor ++ reported an error. I thought they could also be used to process multi-dimensional arrays. After carefully observing the results, we found that the two methods were actually soy sauce.
Please refer to the code

    $array1 = array(2,4,"color" => "red");    $array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);    $array3 = array("e","f","red"=>array("little"=>"little",3,5),2,4);    $array4 = array("a","b","red"=>array("little"=>"big",4,6),8,9);    echo "----------------array_merge---------------".PHP_EOL;    print_r(array_merge($array3,$array4));    echo "----------------+++++++++++++++++++++---------------".PHP_EOL;    print_r($array3+$array4);    echo "----------------array_merge_recursive---------------".PHP_EOL;    print_r(array_merge_recursive($array3,$array4));

The result is as follows:

----------------array_merge---------------Array(    [0] => e    [1] => f    [red] => Array        (            [little] => big            [0] => 4            [1] => 6        )    [2] => 2    [3] => 4    [4] => a    [5] => b    [6] => 8    [7] => 9)----------------+++++++++++++++++++++---------------Array(    [0] => e    [1] => f    [red] => Array        (            [little] => little            [0] => 3            [1] => 5        )    [2] => 2    [3] => 4)----------------array_merge_recursive---------------Array(    [0] => e    [1] => f    [red] => Array        (            [little] => Array                (                    [0] => little                    [1] => big                )            [0] => 3            [1] => 5            [2] => 4            [3] => 6        )    [2] => 2    [3] => 4    [4] => a    [5] => b    [6] => 8    [7] => 9)

After reading the code, I think you can see the meaning of soy sauce: array_merge and + treat the values of the First-dimensional array as a simple variable, then, the imported prime group is processed again by processing the one-dimensional prime group.
Only array_merge_recursive uses an iterative method to process the prime groups in each dimension.

Original article address: php multi-digit combination, thanks to the original author for sharing.