如何在PHP多维数组中筛选出phone列非空的子数组？

嘿，要实现这个需求，用PHP内置的array_filter()函数就是最优解——毕竟内置函数是底层C实现的，比手动写循环高效得多，代码也更简洁。

实现代码 #

$array = [
    0 => [
        "id" => 1,
        "name" => "Sammy",
        "phone" => "2348055643322",
        "email" => "sammy@abc.com"
    ],
    1 => [
        "id" => 2,
        "name" => "Saheed",
        "phone" => "",
        "email" => "saay@aol.com"
    ],
    2 => [
        "id" => 3,
        "name" => "Edwin",
        "phone" => "2348099993322",
        "email" => "eddy@gmail.com"
    ],
    3 => [
        "id" => 3,
        "name" => "Jonadab",
        "phone" => "2348066773322",
        "email" => "jonadab@gmail.com"
    ],
    4 => [
        "id" => 3,
        "name" => "Mercy",
        "phone" => "",
        "email" => "mercy@sysnet.com"
    ]
];

// 过滤出phone非空的子数组，保留原键
$filteredArray = array_filter($array, fn($item) => !empty($item['phone']));

print_r($filteredArray);

代码说明 #

• array_filter()会自动遍历数组，只保留回调函数返回true的元素，默认会保留原数组的键名，正好匹配你想要的结果格式。
• 这里用了PHP 7.4+支持的箭头函数fn($item) => !empty($item['phone'])，如果你的PHP版本低于7.4，可以换成普通匿名函数：

  $filteredArray = array_filter($array, function($item) {
      return !empty($item['phone']);
  });
  

• !empty($item['phone'])会严格排除空字符串、null、0等“空值”，如果只是想排除空字符串，也可以直接写$item['phone'] !== ''，根据你的实际需求调整。

输出结果 #

运行后得到的结果和你期望的完全一致：

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => Sammy
            [phone] => 2348055643322
            [email] => sammy@abc.com
        )

    [2] => Array
        (
            [id] => 3
            [name] => Edwin
            [phone] => 2348099993322
            [email] => eddy@gmail.com
        )

    [3] => Array
        (
            [id] => 3
            [name] => Jonadab
            [phone] => 2348066773322
            [email] => jonadab@gmail.com
        )

)

内容的提问来源于stack exchange，提问作者SaAy