array_combine() Function Use In PHP 7.3 With Example

The `array_combine()` function in PHP takes two arrays as input and creates a new array, using one array as the keys and the other as the values. This function is available in PHP versions including 7.3. Syntax:

<?php
array_combine(array $keys, array $values): array
?>

$keys: An array of keys. $values: An array of values. Key Points: 1. Both the `$keys` and `$values` arrays must have the same number of elements. 2. If the `$keys` array contains duplicate values, the last value from the `$values` array will be used. 3. If the arrays are of unequal length, the function will return `false` and issue a warning. Example:

<?php
$keys = ["a", "b", "c"];
$values = [1, 2, 3];
$combined = array_combine($keys, $values);
print_r($combined);
?>

Output:

<?php
Array
(
[a] => 1
[b] => 2
[c] => 3
)
?>

In this example: 1. The `$keys` array has the values `["a", "b", "c"]`. 2. The `$values` array has the values `[1, 2, 3]`. 3. The `array_combine()` function merges these two arrays into an associative array where each key from the `$keys` array corresponds to the value at the same index in the `$values` array. Error Handling Example:

<?php
$keys = ["a", "b", "c"];
$values = [1, 2];
$combined = array_combine($keys, $values);
if ($combined === false) {
echo "The arrays must have the same number of elements.";
}
?>

Output:

<?php
The arrays must have the same number of elements.
?>

In this case, the function returns `false` because the number of elements in the `$keys` array (3) is not equal to the number of elements in the `$values` array (2).