The Grid Search HackerRank Solution using PHP

gridsearch.php

<?php

function gridSearch($big,$small){
    $firstMatch = null;
    foreach($big as $key => $bigLine){
        $position = strpos($bigLine,$small[0]);
        if ($position!==false){
            $firstMatch = [$key,$position];
            break;
        }
    }

    if (!$firstMatch){
        return false;
    }
    
    for($i=1,$j=$firstMatch[0]+1;$i<count($small);$i++,$j++){
        $position = strpos($big[$j],$small[$i]);
        if($position===false || $position!=$firstMatch[1]){
            return false;
        }
    }
    
    return true;
}
    
$_fp = fopen("php://stdin", "r");
$numberOfTests = (int) fgets($_fp);
$bigGrids = array();
$smallGrids = array();

for($i=0;$i<$numberOfTests;$i++){
    $bigGridLines = '';
    $smallGridLines = '';
    
    $bigGridDimensions = explode(' ',fgets($_fp));
    for ($j=0;$j<$bigGridDimensions[0];$j++){
        $bigGridLines[] = trim(fgets($_fp));
    }
    
    $bigGrids[] = $bigGridLines;

    $smallGridDimensions = explode(' ',fgets($_fp));
    for ($j=0;$j<$smallGridDimensions[0];$j++){
        $smallGridLines[] = trim(fgets($_fp));
    }
    
    $smallGrids[] = $smallGridLines;    
}

foreach($bigGrids as $key => $bigGrid){
    echo gridSearch($bigGrids[$key],$smallGrids[$key])?"YES\n":"NO\n";
}
?>