strpos()
function
Finds position of first occurrence of a substring. Returns false if not found — always use strict comparison (!==).
Syntax
strpos(string $haystack, string $needle, int $offset = 0): int|false
Example
php
<?php
$str = 'Hello World Hello';
echo strpos($str, 'Hello'); // 0
echo strpos($str, 'World'); // 6
echo strrpos($str, 'Hello'); // 12
if (strpos($str, 'World') !== false) {
echo 'Found!';
}
echo stripos('Hello World', 'hello'); // 0