using array_search or loop in PHP to find the position of a key

Solution 1:

Another way is to use preg_match() and a simple foreach. This method avoid the iteration of all items of the array and stops when a match is found.

/**
 * Returns the index of the first match or false if not found.
 */
function arraySearch(array $array, string $search): int|false
{
    foreach ($array as $key => $value) {
        if (preg_match('~' . $search . '$~',$value)) {
            return $key;
        }
    }
    return false;
}

$unique_domains = [
    'www.crownworldwide.com',
    'www.acquisition.gov',
    'www.hemisphere-freight.com',
    'www.businessinsider.com',
    'www.oceansidelogistics.com',
    'mixjet.aero',
    'www.airindiaexpress.in',
    'rlglobal.com',
    'www.metroshipping.co.uk',
    'www.flexport.com'
];

var_dump(arraySearch($unique_domains, 'flexport.co')); // bool(false)
var_dump(arraySearch($unique_domains, 'flexport.com')); // int(9)

• live demo PHP 8.0
• live demo PHP 7.4