Question

我正在向这样的二维数组添加内容：

 $_SESSION['vehicles'][] = array ('model' => $_REQUEST['blah1'], 'price' => $_REQUEST['blah2'], 'year' => $_REQUEST['blah3']);

如何从会话中删除所有具有'model'=到我选择的变量的数组？（注意：在具有相同模型的会话中将始终存在许多数组。）

我已经尝试了以下但它似乎没有从我的会话数组中删除任何东西：

$model = "toyota";
foreach ($_SESSION['vehicles'] as $vehicle) 
{
    unset($vehicle[$model]);
}

谢谢！

Answer 1

$ vehicle通过副本传递，因此，unset $ vehicle什么都不做

$model = "toyota";
foreach ($_SESSION['vehicles'] as $idx => $vehicle){
    if($vehicle['model'] == $model){
        unset($_SESSION['vehicles'][$idx]);
    }
}

Answer 2

$model = 'toyota';

// PHP <= 5.2
$_SESSION['vehicles'] = array_filter($_SESSION['vehicles'],
              create_function('$v', "return \$v['model'] != '$model';"));

// PHP 5.3+
$_SESSION['vehicles'] = array_filter($_SESSION['vehicles'],
              function ($v) use ($model) { return $v['model'] != $model; });

或者，你的方法：

foreach ($_SESSION['vehicles'] as $key => $vehicle) {
    if ($vehicle['model'] == $model) {
        unset($_SESSION['vehicles'][$key]);
    }
}

Answer 3

你必须：

遍布你的车辆
对于每辆车，测试其型号是否是您正在寻找的型号
如果是，请删除它：

这可以通过像这样的代码的一部分来翻译：

$model = "toyota";
foreach ($_SESSION['vehicles'] as $key => $vehicle) 
{
    if ($vehicle['model'] == $model) {
        // The current vehicle's model is what you are searching for
        // => delete if from $_SESSION
        unset($_SESSION['vehicles'][$key]);
    }
}

Answer 4

foreach($_SESSION['vehicles'] as $key => $vehicle) {
    if($vehicle['model'] == "toyota") {
        unset($_SESSION['vehicles'][$key]);
    }
}

应该这样做。

我需要更快地写下答案。

Answer 5

您要删除的内容是$vehicle['toyota']，这在数组中不存在

试试这个......

$model = "toyota";
foreach ($_SESSION['vehicles'] as $key=>$vehicle) 
{
    if($model == $vehicle['model']) {
         unset($_SESSION['vehicles'][$key]);
    }    
}

Answer 6

首先请注意$ _SESSION ['vehicles']是一个带编号的数组，因此$ vehicle [$ model]无法正常工作。接下来修改foreach循环中的项目：

从PHP 5开始，您可以轻松修改数组前面的$ value元素与＆amp ;.这将指定参考而不是复制价值。

$model = "toyota";
foreach ($_SESSION['vehicles'] as &$vehicle) 
{
    if ($vehicle['model'] == $model)
         unset($vehicle);
}

从2d会话数组的php unset数组

6 个答案: