PHP
Create Associative Array from Separate Key and Value Arrays
Combine two simple indexed PHP arrays, one containing keys and the other values, into a single powerful associative array using array_combine.
<?php
$headers = ['Content-Type', 'Authorization', 'User-Agent'];
$values = ['application/json', 'Bearer YOUR_TOKEN', 'MyApp/1.0'];
// Create an associative array where elements from $headers are keys
// and elements from $values are their corresponding values.
$associativeArray = array_combine($headers, $values);
print_r($associativeArray);
/* Expected output:
Array
(
[Content-Type] => application/json
[Authorization] => Bearer YOUR_TOKEN
[User-Agent] => MyApp/1.0
)
*/
// Example with different lengths (will return false)
$keysShort = ['id', 'name'];
$valuesLong = [1, 'Alice', 'Engineer'];
$invalidCombine = array_combine($keysShort, $valuesLong);
echo "
Attempting combine with unequal lengths (returns false):
";
var_dump($invalidCombine);
?>
How it works: The `array_combine()` function in PHP is ideal for constructing an associative array when you have two separate indexed arrays: one for the keys and one for the values. It takes both arrays as arguments and pairs their elements sequentially. A critical point is that both input arrays must have the same number of elements; otherwise, the function returns `false`, preventing malformed arrays.