PHP erhalten Ergebnisse von MySQL in einer for() Schleife

Question

Ich habe eine Art "Karte" für etwas, was ich arbeite. Ich zeichne jede Kachel aus und überprüfe dann anhand einer Datenbank, ob sich jemand auf dieser Kachel befindet.

Der Code funktioniert aber nur für das erste Ergebnis in der Datenbank.

Kann jemand helfen. Danke vielmals.

$sqlw = "SELECT id, player_coord_x, player_coord_y FROM player_game WHERE  world_id='$world'"; 
$world_result = $player_stat->query($sqlw); 


?> 

<div class='map-grid'> 

    <? 
    $id = ''; 
    $size = 16; 
    for($i = 1; $i <= $size; $i++) { 
     echo "<div class='map-grid-row'>"; 
     for ($j=1; $j <= $size; $j++) { 

      // check for player at location 
      if ($world_result->num_rows > 0) { 
       while($w_row = $world_result->fetch_assoc()) { 

        $player_coord_x = $w_row['player_coord_x']; 
        $player_coord_y = $w_row['player_coord_y']; 
        $id = $w_row['id']; 

       } 
      } 

      if ($player_coord_x == $i and $player_coord_y == $j){ 

       echo "<div class='map-grid-cell high'>"; 
       echo "XXX"; 
       echo "</div>"; 
      }else{ 

       echo "<div class='map-grid-cell high'>"; 
       echo "<span class=\"map-small\">(x-$i y-$j)</span>"; 
       echo "</div>"; 
      } 

     } 
     echo "</div>"; 
    } 
    ?> 

</div> 

Answer 1

$sqlw = "SELECT id, player_coord_x, player_coord_y FROM player_game WHERE world_id='$world'"; 
$world_result = $player_stat->query($sqlw); 

if($world_result->num_rows > 0){ 
    while($w_row = $world_result->fetch_assoc()){ 
    //first type of array 
    $player[] = array(
     'x'  => $w_row['player_coord_x'], //your player X record 
     'y'  => $w_row['player_coord_y'], //your player Y record 
     'id'  => $w_row['id'] //your player id 
    ); 

    //second type of array 
    // OR store player's X and Y as key of array 
    $player[$w_row['player_coord_x'] . '-' . $w_row['player_coord_y']] = $w_row['id']; 
    // This are only if the player record will never repeat 
    } 
} 

?> 

<div class="map-grid"> 
    <?php 
    $size = 16; 
    for($i = 1; $i <= $size; $i++){ 
     echo '<div class="map-grid-row">'; 
     for($j = 1; $j <= $size; $j++){ 
     //with first type of array 
     $exists = false; 
     foreach($player as $play){ 
      if($play['x'] == $i && $play['y'] == $j){ 
      $exists = true; 
      break; // break the loop once you got the result. 
      } 
     } 
     if($exists){ //Player exists? if no detect in foreach loop above, default exists would return false. 
      echo '<div class="map-grid-cell high">'; 
      echo 'XXX'; 
      echo '</div>'; 
     } else { 
      echo '<div class="map-grid-cell high">'; 
      echo '<span class="map-small">(x-' . $i . ' y-' . $j . ')</span>'; 
      echo '</div>'; 
     } 



     //second type of array 
     //Check if the key exists and if it's empty. 
     if(isset($player[$i.'-'.$j]) && !empty($player[$i.'-'.$j])){ 
      echo '<div class="map-grid-cell high">'; 
      echo 'XXX'; 
      echo '</div>'; 
     } else { 
      echo '<div class="map-grid-cell high">'; 
      echo '<span class="map-small">(x-' . $i . ' y-' . $j . ')</span>'; 
      echo '</div>'; 
     } 
     } 
    } 
    ?> 
</div>