[PHP Learning] Multiple methods to merge arrays

The main content of this article is the various methods to implement array merging in PHP, which has certain reference value. Interested friends can learn about it.

1.arrary_merge

Sample code:

$arr1 = array(1, 2, 3, 4, 5);
$arr2 = array(1, 2, 6, 7, 8, 9, 10);
$result1 = array_merge($arr1, $arr2);

$arr3 = array("name" => "itbsl", "age" => 13, "sex" => "Male");
$arr4 = array("name" => "火龙果", "age" => 13, "sex" => "Male");
$result2 = array_merge($arr3, $arr4);

echo "<pre class="brush:php;toolbar:false">";
var_dump($result1);
var_dump($result2);

Run the above code, the output result is as shown below:

When merging ordinary arrays, the second array will be placed behind the first array and returned after splicing.
But for an array of key-value pairs, if there are the same keys, the second array will overwrite the values ​​corresponding to the same keys in the first array.

2. Merge through

Sample code:

$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);

Run the above code, the output result is as shown below:

It can be seen that when using " " to merge two arrays, whether it is an ordinary array or a key-value array, as long as the subscript is the same or the key is the same, the former will overwrite the latter. . This needs attention.

3. Connect two arrays

array_combine()The function will get a new array, which consists of a set of submitted keys and corresponding values.
Sample code:

$arr1 = array("A","B","C","D"); 
$arr2 = array("paul","itbsl","Golang","PHP"); 
$result = array_combine($arr1,$arr2); 
echo &#39;<pre class="brush:php;toolbar:false">&#39;;
var_dump($result);

Run the above code, the output result is as shown below:

Note: If you need to merge the arrays into In the above form, the lengths of the two merged arrays must be equal, that is, count($arr1) == count($arr2), and cannot be empty

4. Recursively append arrays

array_merge_recursive()The function is the same as array_merge(), which can merge two or more arrays together to form a combined array. The difference between the two is that the function will handle it differently when a key in an input array already exists in the result array. array_merge() will overwrite the previously existing key/value pairs and replace them with the key/value pairs in the current input array, while array_merge_recursive() will merge the two values ​​together, Form a new array and use the original keys as the array name.
Sample code:

$arr3 = array("name" => "itbsl", "age" => 13, "sex" => "Male");
$arr4 = array("name" => "火龙果", "age" => 13, "sex" => "Male");
$result2 = array_merge_recursive($arr3, $arr4);

echo "<pre class="brush:php;toolbar:false">";
var_dump($result2);

Run the above code, the output result is as shown below:

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