Combine two arrays into a single array:
| <?php $a1=array(“red”,“green”); $a2=array(“blue”,“yellow”); print_r(array_merge($a1,$a2)); ?> |
The array_merge() function combines one or more arrays into a single array.
Tip: You can pass one array or multiple arrays to the function.
Note: If two or more arrays have the same key, the value from the last array overrides the others.
Note: If only one array is passed and it has integer keys, the function returns a new array with integer keys starting at 0 and incrementing by 1 for each value (see example below).
Tip: Unlike array_merge(), the array_merge_recursive() function combines values from arrays with the same key into an array, rather than overriding them.
| array_merge(array1, array2, array3, …) |
|
Parameter |
Description |
|
array1 |
Required. Defines an array. |
|
array2 |
Optional. Provides an array. |
|
array3,… |
Optional. Indicates an array. |
|
Return Value: |
Optional. Indicates an array. |
|
PHP Version: |
4+ |
|
Changelog: |
As of PHP 5.0, this function only accepts parameters of type array. |
Combine two associative arrays into a single array:
| <?php $a1=array(“a”=>“red”,“b”=>“green”); $a2=array(“c”=>“blue”,“b”=>“yellow”); print_r(array_merge($a1,$a2)); ?> |
Using only one array parameter with integer keys:
| <?php $a=array(3=>“red”,4=>“green”); print_r(array_merge($a)); ?> |