Commonly used array functions in PHP (7) Array merge array_merge() and array_merge_recursive()

<span style="color: #008080">1</span> <span style="color: #800080">$arr1</span> = <span style="color: #0000ff">array</span>(1, 2, 3, 4, 'color'=>'red'<span style="color: #000000">);
</span><span style="color: #008080">2</span> <span style="color: #800080">$arr2</span> = <span style="color: #0000ff">array</span>('a', 'b', 'c', 'color'=>'blue'<span style="color: #000000">);
</span><span style="color: #008080">3</span> <span style="color: #008080">print_r</span>(<span style="color: #008080">array_merge</span>(<span style="color: #800080">$arr1</span>, <span style="color: #800080">$arr2</span>));<span style="color: #008000">//同名索引的值会覆盖</span>
<span style="color: #008080">4</span> <span style="color: #008080">print_r</span>(<span style="color: #008080">array_merge_recursive</span>(<span style="color: #800080">$arr1</span>, <span style="color: #800080">$arr2</span>));<span style="color: #008000">//</span><span style="color: #008000">相同的键名 不会覆盖，如果是单个元素会在转为一个一维数组</span>

Both functions are used to merge arrays. Parameters can be arrays of 1 to n. (Uh, I don’t understand what is used when the parameter is an array. Who knows? Tell me.)

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Output result:

Line 3:

Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[color] => blue //Please note the difference in this line
[4] => a
[5] => b
[6] => c
)

Line 4:

Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[color] => Array //Pay attention to the difference here
(
[0] => red
[1] => blue
)

[4] => a
[5] => b
[6] => c
)