How to delete specified subscript elements in a two-dimensional array in php

In PHP, if we need to delete a two-dimensional array, we often encounter situations where we need to delete the specified subscript. At this time, we can use the unset function to achieve this. The specific method is as follows:

unset($array[$key]);

Among them, $array is the target array, and $key is the subscript that needs to be deleted.

But if we need to delete multiple subscripts, how should we do it?

Don’t worry, PHP provides a simple and effective method, using foreach loop combined with unset. The specific method is as follows:

foreach($keys as $key) {
    unset($array[$key]);
}

Among them, $keys consists of the subscripts that need to be deleted. array.

Below, we use a specific example to demonstrate how to use this method.

Suppose we have a two-dimensional array $students, which stores information about multiple students, including name, age, gender, place of origin, etc. Now we need to delete all student information whose native place is "Beijing". The implementation code is as follows:

$students = array(
    array('name' => '张三', 'age' => 18, 'gender' => '男', 'hometown' => '北京'),
    array('name' => '李四', 'age' => 19, 'gender' => '女', 'hometown' => '上海'),
    array('name' => '王五', 'age' => 20, 'gender' => '男', 'hometown' => '北京'),
    array('name' => '赵六', 'age' => 21, 'gender' => '女', 'hometown' => '广州'),
    array('name' => '钱七', 'age' => 22, 'gender' => '男', 'hometown' => '深圳')
);

$keys = array();    // 定义一个空数组，用于存储需要删除的下标

foreach($students as $key => $value) {
    if($value['hometown'] == '北京') {
        $keys[] = $key;    // 将需要删除的下标添加到数组中
    }
}

foreach($keys as $key) {
    unset($students[$key]);    // 删除具体下标的元素
}

Through this code, we successfully delete the student information whose native place is "Beijing" in the two-dimensional array $students.

To summarize, we can use the unset function combined with the foreach loop to delete the elements with the specified subscript in the two-dimensional array, which can greatly improve our programming efficiency.

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