如何删除空的关联数组条目 [英] How to remove empty associative array entries

问题描述

我有一个关联数组:$csv_arr

Array
(
    [0] => Array
        (
            [Enfalac] => alpha linolenic acid 300 mg
            [Enfapro] => alpha linolenic acid 200 mg
        )

    [1] => Array
        (
            [Enfalac] => arachidonic acid 170 mg
            [Enfapro] => 
        )

    [2] => Array
        (
            [Enfalac] => 
            [Enfapro] => 
        )

    [3] => Array
        (
            [Enfalac] => calcium 410 mg
            [Enfapro] => calcium 550 mg
        )
)

如何删除所有完全空白的条目(例如$csv_arr[2])，但保留部分条目(例如$csv_arr[1]

How can I remove all completely empty entries such as $csv_arr[2] but preserve partial entries such as $csv_arr[1]

我已经尝试过$csv_arr = array_filter(array_map('array_filter', $csv_arr));，但这会删除空元素:$csv_arr[1]['Enfapro']

I've tried $csv_arr = array_filter(array_map('array_filter', $csv_arr)); but this removes the empty element: $csv_arr[1]['Enfapro']

Thx

推荐答案

尝试一下，有点奇怪，但是:

Try this, a little weird, but :

array_filter($csv_arr, function($v){return array_filter($v) == array();});

完全未经测试，我不记得这是否是正确的语法，但它可以正常工作.

Completely untested and I don't remember if this is the proper syntax or not for closures, but it could work.

编辑(经过测试并且可以正常工作):

Edit (tested and working):

<?php
$csv_arr = array(
    0 => array(
            'Enfalac' => 'alpha linolenic acid 300 mg',
            'Enfapro' => 'alpha linolenic acid 200 mg'
        ),

    1 =>  array(
            'Enfalac' => 'arachidonic acid 170 mg',
            'Enfapro' => ''
        ),

    2 =>  array(
            'Enfalac' => '',
            'Enfapro' => ''
        ),

    3 =>  array(

            'Enfalac' => 'calcium 410 mg',
            'Enfapro' => 'calcium 550 mg'
        )
);
$c = function($v){
    return array_filter($v) != array();
};
var_dump(array_filter($csv_arr, $c));
?>

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