In PHP, you can use the plus sign " " to merge arrays, the specific syntax format is "array 1 array 2", so that the key names of the combined arrays will not be reset. Use the plus sign " " to merge two arrays, whether they are ordinary arrays or key-value arrays. As long as the subscripts are the same or the keys are the same, the former overwrites the latter.
The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer
Generally, array_merge is used to merge two arrays in PHP ()
For example:
$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc']; $data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff']; $data = array_merge($data1, $data2); var_dump($data);
Get the result:
array(6) { [0]=> string(3) "aaa" [1]=> string(3) "bbb" [2]=> string(3) "ccc" [3]=> string(3) "ddd" [4]=> string(3) "eee" [5]=> string(3) "fff" }
You can see that using array_merge() will reset the key value. If the key value is useful to us, we don’t want to reset it. , you can use " " to merge arrays.
$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc']; $data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff']; $data = $data1 + $data2; var_dump($data);
Get the result:
array(6) { [111]=> string(3) "aaa" [222]=> string(3) "bbb" [333]=> string(3) "ccc" [444]=> string(3) "ddd" [555]=> string(3) "eee" [666]=> string(3) "fff" }
Explanation:
For using " " to merge two arrays, whether it is an ordinary array or a key-value pair array, just download If the labels are the same or the keys are the same, the former overrides the latter. This needs attention.
$arr1 = array(1, 2, 3, 4, 5); $arr2 = array(1, 2, 6, 7, 8, 9, 10); $result1 = $arr1 + $arr2; $arr3 = array("name" => "itbsl", "age" => 13, "sex" => "Male"); $arr4 = array("name" => "火龙果", "age" => 13, "sex" => "Male", "id" => "411521"); $result2 = $arr3 + $arr4; echo "<pre class="brush:php;toolbar:false">"; var_dump($result1); var_dump($result2);
Get the result:
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