PHP：删除多维数组中的空数组字符串[duplicate]

This question already has an answer here:

这个问题在这里已有答案：

How to remove empty values from multidimensional array in PHP? 8 answers
如何从PHP中的多维数组中删除空值？ 8个答案

I have this array:

我有这个数组：

$aryMain = array(array('hello','bye'), array('',''),array('',''));

It is formed by reading a csv file and the array('','') are the empty rows at the end of the file.

它是通过读取csv文件而形成的，数组（''，''）是文件末尾的空行。

How can I remove them?

我该如何删除它们？

I've tried:

我试过了：

$aryMain = array_filter($aryMain);

But it is not working :(

但它不起作用:(

Thanks a lot!

非常感谢！

3 个解决方案

#1

To add to Rikesh's answer:

要添加到Rikesh的答案：

<?php
$aryMain = array(array('hello','bye'), array('',''),array('','')); 
$aryMain = array_filter(array_map('array_filter', $aryMain));
print_r($aryMain);

?>

Sticking his code into another array_filter will get rid of the entire arrays themselves.

将他的代码粘贴到另一个array_filter中将自己摆脱整个数组。

Array
(
    [0] => Array
        (
            [0] => hello
            [1] => bye
        )

)

Compared to:

相比：

$aryMain = array_map('array_filter', $aryMain);

Array
(
    [0] => Array
        (
            [0] => hello
            [1] => bye
        )

    [1] => Array
        (
        )

    [2] => Array
        (
        )

)

#2

Use array_map along with array_filter,

将array_map与array_filter一起使用，

$array = array_filter(array_map('array_filter', $array));

Or just create a array_filter_recursive function

或者只是创建一个array_filter_recursive函数

function array_filter_recursive($input) 
{ 
   foreach ($input as &$value) 
    { 
      if (is_array($value)) 
      { 
         $value = array_filter_recursive($value); 
      } 
   }     
   return array_filter($input); 
}

DEMO.

DEMO。

Note: that this will remove items comprising '0' (i.e. string with a numeral zero). Just pass 'strlen' as a second parameter to keep 0

注意：这将删除包含'0'的项目（即带有数字零的字符串）。只需将'strlen'作为第二个参数传递即可保持0

#3

Apply array_filter() on the main array and then once more on the inner elements:

在主数组上应用array_filter（），然后在内部元素上再次应用：

$aryMain = array_filter($aryMain, function($item) {
    return array_filter($item, 'strlen');
});

The inner array_filter() specifically uses strlen() to determine whether the element is empty; otherwise it would remove '0' as well.

内部array_filter（）专门使用strlen（）来确定元素是否为空;否则它也会删除'0'。

To determine the emptiness of an array you could also use array_reduce():

要确定数组的空虚，您还可以使用array_reduce（）：

array_filter($aryMain, function($item) {
    return array_reduce($item, function(&$res, $item) {
        return $res + strlen($item);
    }, 0);
});

Whether that's more efficient is arguable, but it should save some memory :)

是否更高效是有争议的，但它应该节省一些内存:)

#1