PHP array_combine() Function
Topic: PHP Array ReferencePrev|Next
Description
The array_combine() function creates an array by using one array for keys and another for its values.
The following table summarizes the technical details of this function.
| Return Value: | Returns the combined array, FALSE if the number of elements for each array isn't equal. |
|---|---|
| Changelog: | Versions before PHP 5.4.0 issues E_WARNING and returns FALSE for empty arrays. |
| Version: | PHP 5+ |
Syntax
The basic syntax of the array_combine() function is given with:
The following example shows the array_combine() function in action.
Example
Run this code »<?php
// Sample arrays
$array1 = array("a", "b", "c", "d");
$array2 = array("apple", "ball", "cat", "dog");
// Combining both arrays
print_r(array_combine($array1, $array2));
?>Parameters
The array_combine() function accepts the following parameters.
| Parameter | Description |
|---|---|
| keys | Required. Specifies the array of keys to be used. |
| values | Required. Specifies the array of values to be used. |
Note: Both the arrays you want to combine using the array_combine() function must have equal number of elements, otherwise it returns FALSE.
More Examples
Here're some more examples showing how array_combine() function basically works:
If the array you want to use for keys has duplicate values, the later value will prevail as key in the combined array, as shown in the following example:
Example
Run this code »<?php
// Sample arrays
$array1 = array("a", "a", "b", "c");
$array2 = array(1, 2, 3, 4);
// Combining both arrays
print_r(array_combine($array1, $array2));
?>
