In PHP, we usually use the array_merge()
function to merge two or more arrays. However, sometimes we need a more efficient way to merge arrays and need to avoid using function calls. In this article, we will share some ways to merge arrays without using functions.
1. Use
Operator
Operator can be used to merge two arrays. It will merge the left array with the right array and remove the same key names in the right array as in the left array. Here is an example of merging arrays using the
operator:
$arr1 = ['a' => 1, 'b' => 2]; $arr2 = ['b' => 3, 'c' => 4]; $result = $arr1 + $arr2; print_r($result); // 输出:Array ( [a] => 1 [b] => 2 [c] => 4 )
In the above example, the key name in the $arr1
array is b
The key names in the and $arr2
arrays are b
. After merging the two arrays using the
operator, only the $result
remains in the array. b
in $arr1
, and b
in $arr2
are ignored.
2. Use the $array[]
syntax
In PHP, you can use the $array[]
syntax to add elements to the end of the array. This way we can merge two arrays into one. Here is an example of merging arrays using the $array[]
syntax:
$arr1 = ['a' => 1, 'b' => 2]; $arr2 = ['b' => 3, 'c' => 4]; foreach ($arr2 as $key => $value) { $arr1[$key] = $value; } print_r($arr1); // 输出:Array ( [a] => 1 [b] => 3 [c] => 4 )
In the above example, we iterate over the $arr2
array, merging each Elements are added to the $arr1
array. In this way, we can add the elements of the $arr2
array to the $arr1
array, thereby merging the arrays.
3. Alternative method of using array_replace_recursive()
function
In PHP, we can use the array_replace_recursive()
function to merge two arrays . However, this function recursively merges elements from two arrays, so it may be slower when working with large arrays. Here is an example of merging arrays using the array_replace_recursive()
function:
$arr1 = ['a' => ['b' => 2, 'c' => 3]]; $arr2 = ['a' => ['c' => 4, 'd' => 5]]; $result = array_replace_recursive($arr1, $arr2); print_r($result); // 输出:Array ( [a] => Array ( [b] => 2 [c] => 4 [d] => 5 ) )
In the above example, the a
elements in the $arr1
array Contains the c
elements in the $arr2
array. After merging the two arrays using the array_replace_recursive()
function, the $result
# in the array The ##a element contains the
c and
d elements in the
$arr2 array.
array_replace_recursive() function and achieve merging of arrays at the same time. We can use the
array_merge_recursive() function and the
array_replace() function. Here is an example of merging arrays using this method:
$arr1 = ['a' => ['b' => 2, 'c' => 3]]; $arr2 = ['a' => ['c' => 4, 'd' => 5]]; $result = array_merge_recursive($arr1, $arr2); $result = array_replace($result, $arr1); print_r($result); // 输出:Array ( [a] => Array ( [b] => 2 [c] => 4 [d] => 5 ) )
array_merge_recursive() function and then use
array_replace () The function overwrites the elements in the
$arr1 array into the result array. In this way, we successfully merged the two arrays into one.
array_merge() function to merge two or more arrays. In this article, we introduced ways to merge arrays without using functions, including alternatives using the
operator,
$array[] syntax,
array_merge_recursive() function wait. These methods can improve the efficiency of your code and reduce the overhead of function calls.
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