如何计算多维数组中非空数组的值？

Question

[pending_work] => Array 
     (
      [0] => Array 
       (
        [tmp_name] => D:\xampp\tmp\php4B33.tmp 
        [error] => 0 
        [name] => Chrysanthemum.jpg 
        [type] => image/jpeg 
        [size] => 879394 
       ) 

      [1] => Array 
       (
        [tmp_name] => 
        [error] => 4 
        [name] => 
        [type] => 
        [size] => 0 
       ) 

      [2] => Array 
       (
        [tmp_name] => 
        [error] => 4 
        [name] => 
        [type] => 
        [size] => 0 
       ) 

      [3] => Array 
       (
        [tmp_name] => 
        [error] => 4 
        [name] => 
        [type] => 
        [size] => 0 
       ) 

     ) 

这是给出数组值的上述数组。正如你所看到的，只有一个'tmp_name'字段不是空的，而其他的是空的。我如何检查并记录至少tmp_name是否为空？我有四种用于上传图片的输入类型，我想检查是否应该上传至少一张图片。

Answer 1

使用array_column和array_filter

if(count(array_filter(array_column($array['pending_work'],'tmp_name')))>0){ 

} 

Answer 2

最好的方法，提供了最大的灵活性，是一个过滤的策略：

<?php 
$pending_work = [ 
    [ 
     'tmp_name' => 'D:\\xampp\\tmp\\php4B33.tmp', 
     'error' => 0, 
     'name' => 'Chrysanthemum.jpg', 
     'type' => 'image/jpeg', 
     'size' => 879394 
    ], 
    [ 
     'tmp_name' => null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ], 
    [ 
     'tmp_name]'=> null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ], 
    [ 
     'tmp_name' => null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ] 
]; 
$filtered_work = array_filter($pending_work, function($entry) { 
    return !empty($entry['tmp_name']); 
}); 
print_r($filtered_work); 

以上代码的输出显然是：

Array 
(
    [0] => Array 
     (
      [tmp_name] => D:\xampp\tmp\php4B33.tmp 
      [error] => 0 
      [name] => Chrysanthemum.jpg 
      [type] => image/jpeg 
      [size] => 879394 
     ) 

) 

你可以计算那里的条目或者使用结果，不管。

Answer 3

使用下面的代码array_filter有助于在这种情况下。

Click here for demo

$array = [ 
    [ 
     'tmp_name' => 'D:\\xampp\\tmp\\php4B33.tmp', 
     'error' => 0, 
     'name' => 'Chrysanthemum.jpg', 
     'type' => 'image/jpeg', 
     'size' => 879394 
    ], 
    [ 
     'tmp_name' => null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ], 
    [ 
     'tmp_name]'=> null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ], 
    [ 
     'tmp_name' => null, 
     'error' => 4, 
     'name' => null, 
     'type' => null, 
     'size' => 0 
    ] 
]; 
$result_arary = array_filter($array, function($arr) { 
    return !empty($arr['tmp_name']); 
}); 
echo count($result_arary); 
print_r($result_arary);