将多维数组转换为单个数组并删除键

问题描述：

array (size=1551884)
   0 => 
      array (size=1)
         'entity_id' => string '131813' (length=6)
   1 => 
      array (size=1)
         'entity_id' => string '213808' (length=6)
   2 => 
      array (size=1)
         'entity_id' => string '712885' (length=6)

is it possible to convert it to single array without the key 'entity_id' without a loop?

I have tried this one :

call_user_func_array('array_merge', $array)

but somehow is only returning 1 element

UPDATE:

here are the benchmark results from the given answers to this question:

php version > 5.6

array_column: 0.20802903175354
foreach: 0.46231913566589
array_map: 1.021989107132

php version > 7

array_column: 0.079965829849243
foreach: 0.15323305130005
array_map: 0.28970503807068

  array（size = 1551884）
 0 =＆gt;  
 array（size = 1）
'ental_id'=＆gt; 字符串'131813'（长度= 6）
 1 =＆gt;  
 array（size = 1）
'ental_id'=＆gt; 字符串'213808'（长度= 6）
 2 =＆gt;  
 array（size = 1）
'ental_id'=＆gt; 字符串'712885'（长度= 6）
  code>  pre> 
 
 是否可以将其转换为单个数组，而不使用没有循环的键'entity_id'？ p> \  n 
 
  array 
 0 =＆gt; 
 131813 
 1 =＆gt; 
 213808 
 2 =＆gt; 
 712885 
  code>  pre> 
 \  n 我试过这个： p> 
 
 
  call_user_func_array（'array_merge'，$ array）
  code>  pre> 
 
  但不知何故只返回1个元素 p> 
 
 
更新： p> 
 
 
这里是来自这个问题的给定答案的基准测试结果： p> 
  
 
 php版本＆gt;  5.6  p> 
 
 
  array_column：0.20802903175354 
foreach：0.46231913566589 
array_map：1.021989107132 
  code>  pre> 
 
  php version＆gt;  7  p> 
 
 
  array_column：0.079965829849243 
foreach：0.15323305130005 
array_map：0.28970503807068 
  code>  pre> 
  div>

答

This is also possible with array_column.

$result = array_column($your_array, 'entity_id');

答

You can do this very easily with array_map like this:

$result = array_map(function($value) {
    return $value['entity_id'];
}, $originalArray);

Working example: https://3v4l.org/JOEMI

Of course you could also do it with a foreach loop:

$result = [];
foreach($originalArray AS $entity) {
    $result[] = $entity['entity_id'];
}

Working example: https://3v4l.org/9J5XH

I prefer the first option personally.

Update: the accepted answer is clearly the best way. Do that! Leaving this here for comparison.

将多维数组转换为单个数组并删除键

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