如何在PHP中替换基于数组值的数组项？

<?php
$array = [
    ['id' => 1, 'name' => 'Alice', 'age' => 25],
    ['id' => 2, 'name' => 'Bob', 'age' => 30],
    ['id' => 3, 'name' => 'Charlie', 'age' => 35]
];

// 假设我们想把所有年龄大于30岁的人的名字替换为'Old'
$newArray = array_map(function($item) {
    if ($item['age'] > 30) {
        $item['name'] = 'Old';
    }
    return $item;
}, $array);

print_r($newArray);
?>

<?php
$array = [
    ['id' => 1, 'name' => 'Alice', 'age' => 25],
    ['id' => 2, 'name' => 'Bob', 'age' => 30],
    ['id' => 3, 'name' => 'Charlie', 'age' => 35]
];

// 假设我们想把所有年龄大于30岁的人的名字替换为'Old'
foreach ($array as &$item) {
    if ($item['age'] > 30) {
        $item['name'] = 'Old';
    }
}

unset($item); // 释放引用

print_r($array);
?>

<?php
$array = [
    ['id' => 1, 'name' => 'Alice', 'age' => 25],
    ['id' => 2, 'name' => 'Bob', 'age' => 30],
    ['id' => 3, 'name' => 'Charlie', 'age' => 35]
];

// 假设我们想把所有年龄大于30岁的人的名字替换为'Old'
array_walk($array, function(&$item) {
    if ($item['age'] > 30) {
        $item['name'] = 'Old';
    }
});

print_r($array);
?>