PHP - 如何將$ key => $ value添加到二維關聯數組中

Question

我試圖將一組新的鍵和值添加到二維關聯數組中。這裏是我的陣列

myArray = array(1 => array("John", 500, "2012-09-02"), 
2 => array("Mike", 105, "2012-07-01"), 
3 => array("Joe", 24, "2011-12-23"), 
4 => array("Alex", 65, "2012-08-30")); 

我希望做的是有用戶輸入比或者增加值[1]的ID和名稱由5如果輸入的數據是myArray的，但如果它不是比我會喜歡將他們的信息作爲新數據添加到數組中，所以它應該輸出/打印第5個$ key和$ values。 if語句正常工作，並將value [1]加5，但我似乎無法得到else if語句來添加新條目。

$nameExists = FALSE; 
$name = htmlspecialchars($_POST['name']); 
$id = htmlspecialchars($_POST['id']); 

foreach($myArray as $key => $value){ 
    if($key == $id && $value[0] == $name){ 
    $value[1] = $value[1] + 5; 
    $nameExists = TRUE; 
     } 
     else if ($nameExists === FALSE){ 
      $newData = array($name, 1, date("Y-m-d")); 
      $myArray[] = $newData; 
     } 
     echo "<tr><td>".$key."</td> 
        <td>".$value[0]."</td> 
        <td>".$value[1]."</td> 
        <td>".$value[2]."</td></tr>"; 
} 

任何幫助表示感謝，謝謝。

Answer 1

看起來您的邏輯流程問題與$nameExists === FALSE檢查。應該在之後測試整個foreach循環已經完成，而不是循環體內部。否則，循環測試第一個數組元素的匹配，如果沒有找到正確的，則繼續追加到數組。

取而代之，將$nameExists === FALSE移至循環之後。如果未找到匹配項，該標誌將不會被設置爲TRUE，並且數組追加應該起作用。

$nameExists = FALSE; 

// Note: use htmlspecialchars() on *output to HTML* not on input filtering! 
// If you print these values later in the page, you should enclose them 
// in htmlspecialchars() at that time. Placing it here may cause 
// your values not to match in the loop if the stored vals were unescaped. 
$name = $_POST['name']; 
$id = $_POST['id']; 

// Note the &$value is needed here to modify the array inside the loop by reference 
// If left out, you'll get through the loop and changes will be discarded. 
foreach($myArray as $key => &$value){ 
    if($key == $id && $value[0] == $name){ 
     $value[1] = $value[1] + 5; 
     $nameExists = TRUE; 
     // No need to continue looping, you can exit the loop now 
     break; 
    } 
    // Finish loop - flag was set TRUE if any match was found 
} 

// Now, if nothing was modified in the loop and the flag is still FALSE, append a new one 
if ($nameExists === FALSE){ 
    $newData = array($name, 1, date("Y-m-d")); 
    $myArray[] = $newData; 
} 


// Use a separate loop to output your complete array after modification 
foreach ($myArray as $key => $value) { 
    // use htmlspecialchars() here instead... 
    // And display output values indexed $myArray[$id] 
    echo "<tr><td>".$key."</td> 
     <td>".htmlspecialchars($value[0])."</td> 
     <td>".htmlspecialchars($value[1])."</td> 
     <td>".htmlspecialchars($value[2])."</td></tr>"; 
} 

入住the PHP foreach documentation票據有關修改環形陣列&引用。