PHP - 如何递归删除数组的空条目? [英] PHP - How to remove empty entries of an array recursively?

问题描述

我需要删除多级数组上的空条目.现在我可以删除带有空子数组的条目，但不能删除空数组......困惑，我也是......我认为代码将有助于更好地解释......

I need to remove empty entries on multilevel arrays. For now I can remove entries with empty sub-arrays, but not empty arrays... confused, so do I... I think the code will help to explain better...

<?php

/**
 * 
 * This function remove empty entries on arrays
 * @param array $array
 */
function removeEmptysFromArray($array) {

    $filtered = array_filter($array, 'removeEmptyItems');
    return $filtered;
}

/**
 * 
 * This is a Callback function to use in array_filter()
 * @param array $item
 */
function removeEmptyItems($item) {

    if (is_array($item)) {
        return array_filter($item, 'removeEmptyItems');
    }

    if (!empty($item)) {
        return true;  
    }
}


$raw = array(
    'firstname' => 'Foo',
    'lastname'  => 'Bar',
    'nickname' => '',
    'birthdate' => array( 
        'day'   => '',
        'month' => '',
        'year'  => '',
    ),
    'likes' => array(
        'cars'  => array('Subaru Impreza WRX STi', 'Mitsubishi Evo', 'Nissan GTR'),
        'bikes' => array(),
    ),
);

print_r(removeEmptysFromArray($raw));

?>

好的，此代码将删除昵称"、生日"，但不会删除具有空数组的自行车".

Ok, this code will remove "nickname", "birthdate" but is not removing "bikes" that have an empty array.

我的问题是...如何删除自行车"条目?

My question is... How to remove the "bikes" entry?

此致，

对不起我的英语...

推荐答案

试试这个代码:

<?php
function array_remove_empty($haystack)
{
    foreach ($haystack as $key => $value) {
        if (is_array($value)) {
            $haystack[$key] = array_remove_empty($haystack[$key]);
        }

        if (empty($haystack[$key])) {
            unset($haystack[$key]);
        }
    }

    return $haystack;
}

$raw = array(
    'firstname' => 'Foo',
    'lastname'  => 'Bar',
    'nickname' => '',
    'birthdate' => array(
        'day'   => '',
        'month' => '',
        'year'  => '',
    ),
    'likes' => array(
        'cars'  => array('Subaru Impreza WRX STi', 'Mitsubishi Evo', 'Nissan GTR'),
        'bikes' => array(),
    ),
);

print_r(array_remove_empty($raw));

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