Introduction to php array_column() function (example)

Function introduction:

array_column() Returns an array whose value is the value of a single column in the input array.

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Syntax:

array_column(array,column_key,index_key);

Parameters:

• array Required. Specifies the multidimensional array (record set) to use.

• column_key Required. The column whose value needs to be returned.

• index_key Optional. The column that is the index/key of the returned array.

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Example:

Take out the last_name column from the record set and use the corresponding "id" column as key value:

<?php
// 可能从数据库中返回数组
$a = array(
  array(
    &#39;id&#39; => 5698,
    &#39;first_name&#39; => &#39;Peter&#39;,
    &#39;last_name&#39; => &#39;Griffin&#39;,
  ),
  array(
    &#39;id&#39; => 4767,
    &#39;first_name&#39; => &#39;Ben&#39;,
    &#39;last_name&#39; => &#39;Smith&#39;,
  ),
  array(
    &#39;id&#39; => 3809,
    &#39;first_name&#39; => &#39;Joe&#39;,
    &#39;last_name&#39; => &#39;Doe&#39;,
  )
);

$last_names = array_column($a, &#39;last_name&#39;, &#39;id&#39;);
print_r($last_names);
?>

Output result:

Array
(
  [5698] => Griffin
  [4767] => Smith
  [3809] => Doe
)

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