Strstr PHP implementation

strstr.php

<?php 

	function search(string $pattern, string $text): int
	{
		$patternLength = strlen($pattern);
		$textLength = strlen($text);
		for ($i=0; $i< $textLength-$patternLength; $i++) {
			for ($j=0; $j < $patternLength; $j++) {
				if ($pattern[$j] != $text[$i+$j]) {
					break;
				}
			}
			if ($j == $patternLength) {
				return $i;
			}
		}
		return -1;
	}

 	$text = "ACAADAABAAABAAAABA";
  $pattern = "AABA";
  echo search($pattern, $text);
?>