Permutation in String with PHP.

PermutationInString.php

<?php
class Solution {

	/**
	 * @param String $s1
	 * @param String $s2
	 * @return Boolean
	 */
	function checkInclusion($s1, $s2) {
		$map = [];

		for( $i = 0; $i < strlen( $s1 ); $i ++ ) {
			if ( ! isset( $map[ $s1[$i] ] ) ) {
				$map[ $s1[$i] ] = 0;
			}

			$map[ $s1[$i] ] ++;
		}

		$i = 0;
		$j = 0;
		$temp = [];
		while( $i < strlen($s2) ) {

			if ( $j - $i === strlen($s1) ) {
				return true
			}

			if ( ! isset( $map[$s2[$j]] ) ) {
				$i = $j + 1;
				$j = $i;

				unset( $temp );

				continue;
			}

			if ( ! isset($temp[ $s2[$j] ]) ) {
				$temp[ $s2[$j] ] = 0;
			}

			$temp[ $s2[$j] ] ++;

			if ( $temp[ $s2[$j] ] > $map[ $s2[$j] ] ) {
				$i ++;
				$j = $i;

				unset( $temp );
			} else {
				$j ++;
			}

		}

		return false;
	}
}

$solution = new Solution();
$solution->checkInclusion( 'abc', 'eeeeeeeebca' );