Check if string starts with certain characters in PHP

You can check if a certain string is the exact start of another string:

<?php
function startsWith($string, $startString) {
    return mb_strpos($string, $startString) === 0;
}

// usage
echo startsWith("cat", "ca"); // true
echo startsWith("dog", "x"); // false

If you want to check case insensitively(Unlike the mb_strpos(), mb_stripos() is case-insensitive.):

<?php
function startsWith($string, $startString) {
    return mb_stripos($string, $startString) === 0;
}

// usage
echo startsWith("cat", "ca"); // true
echo startsWith("dog", "x"); // false