Find space between a word

SpaceBetweenWord.php

<?php

function longestSpaceBetweenWord( $s, $word ) {
	$wordMapBkp = wordMap( $word );
	$wordMap = $wordMapBkp;

	$i = 0;
	$j = 0;
	$programmerStrings = [];
	$max = 0;

	while( $j < strlen( $s ) ) {
		if ( isset( $wordMap[ $s[ $j ] ] ) && $wordMap[ $s[ $j ] ] > 0 ) {
			$wordMap[ $s[ $j ] ] --;

			if ( $j - $i === strlen( $word ) - 1 ) {
				$newWord = [ 'start' => $i, 'end' => $j ];

				if ( $programmerStrings ) {
					$last = array_pop( $programmerStrings );
					$length = $newWord[ 'start' ] - $last[ 'end' ] - 1;

					if ( $max < $length ) {
						$max = $length;
					}
				}

				$programmerStrings[] = $newWord;
			}

			$j ++;
		} elseif ( $i === $j ) {
			$i ++;
			$j ++;
		} else {
			$i = $j;
			$wordMap = $wordMapBkp;
		}
	}

	echo $max;
}

function wordMap( $word ) {
	$map = [];

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

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

	return $map;
}

longestSpaceBetweenWord( 'programmerabcprogrammer', 'programmer' );