Question

我试图将一组新的键和值添加到二维关联数组中。这是我的数组

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"));

我想要做的是让用户输入一个ID和一个名称，如果他们输入的数据在myArray中，则增加值[1]为5，但是如果它不是我想要添加他们的信息作为新数据进入数组，因此它应输出/打印第5个$ key和$ values。 if语句工作正常，并将值5添加到[1]，但我似乎无法使用else if语句添加新条目。

$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>";
}

任何帮助表示感谢，谢谢。

Answer 1

对$nameExists === FALSE的检查看起来有一个逻辑流问题。这应该在整个foreach循环完成之后进行测试，而不是在循环体内。否则，循环测试第一个数组元素是否匹配，如果没有找到，则继续追加到数组。

而是将$nameExists === FALSE移到循环之后。如果未找到匹配项，则该标志将不会设置为TRUE，并且数组追加应该有效。

$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>"; }

检查the PHP foreach documentation中有关使用&引用修改循环数组的注释。

PHP - 如何添加$ key =＆gt; $ value到二维关联数组

1 个答案: