php 多维数组筛选

1. 使用foreach循环筛选多维数组元素：

<?php
$data = [
    [
        'name' => 'Alice',
        'age' => 25,
    ],
    [
        'name' => 'Bob',
        'age' => 30,
    ],
    [
        'name' => 'Charlie',
        'age' => 35,
    ],
];

$filteredData = [];

foreach ($data as $item) {
    if ($item['age'] >= 30) {
        $filteredData[] = $item;
    }
}

print_r($filteredData);
?>

输出结果：

Array
(
    [0] => Array
        (
            [name] => Bob
            [age] => 30
        )

    [1] => Array
        (
            [name] => Charlie
            [age] => 35
        )

)

2. 使用array_filter()函数结合匿名函数筛选多维数组元素：

<?php
$data = [
    [
        'name' => 'Alice',
        'age' => 25,
    ],
    [
        'name' => 'Bob',
        'age' => 30,
    ],
    [
        'name' => 'Charlie',
        'age' => 35,
    ],
];

$filteredData = array_filter($data, function($item){
    return $item['age'] >= 30;
});

print_r($filteredData);
?>

输出结果：

Array
(
    [1] => Array
        (
            [name] => Bob
            [age] => 30
        )

    [2] => Array
        (
            [name] => Charlie
            [age] => 35
        )

)

3. 使用array_filter()函数结合array_values()函数筛选多维数组元素并重新索引：

<?php
$data = [
    [
        'name' => 'Alice',
        'age' => 25,
    ],
    [
        'name' => 'Bob',
        'age' => 30,
    ],
    [
        'name' => 'Charlie',
        'age' => 35,
    ],
];

$filteredData = array_values(array_filter($data, function($item){
    return $item['age'] >= 30;
}));

print_r($filteredData);
?>

输出结果：

Array
(
    [0] => Array
        (
            [name] => Bob
            [age] => 30
        )

    [1] => Array
        (
            [name] => Charlie
            [age] => 35
        )

)

根据实际需求，选择适合的方法来筛选多维数组元素。以上是几种常见的PHP多维数组筛选方法的完整可运行代码。