How to convert a PHP two-dimensional array to one-dimensional array

Two-dimensional array: {code...} is converted to {code...}. Please try not to use foreach. Try to use a two-dimensional array of php built-in functions:

Array ([0] => Array ([cnname] => Burberry) [1] => Array ([cnname] => Baobao ))

The conversion result is

Array ('burberry ', 'baobao ');

Please try not to use foreach, and try to use php built-in functions

Reply content:

Two-dimensional array:

Array ([0] => Array ([cnname] => Burberry) [1] => Array ([cnname] => Baobao ))

The conversion result is

Array ('burberry ', 'baobao ');

Please try not to use foreach, and try to use php built-in functions

$ Old = array ("cnname" => "Burberry"), array ("cnname" => "Baobao"); var_dump (array_column ($ old, 'cnname '));

Json_decode (str_replace (array ('"cnname":', "{", "}"), array ('','',''), json_encode ($ arr); efficiency cannot be guaranteed.

   2135,        'first_name' => 'John',        'last_name' => 'Doe',    ),    array(        'id' => 3245,        'first_name' => 'Sally',        'last_name' => 'Smith',    ),    array(        'id' => 5342,        'first_name' => 'Jane',        'last_name' => 'Jones',    ),    array(        'id' => 5623,        'first_name' => 'Peter',        'last_name' => 'Doe',    )); $first_names = array_column($records, 'first_name');print_r($first_names);?>

Result

Array(    [0] => John    [1] => Sally    [2] => Jane    [3] => Peter)

Http://php.net/manual/ja/function.array-column.php

$ Old = array ("cnname" => "Burberry"), array ("cnname" => "Baobao"); $ new = array (); for ($ I = 0; $ I <count ($ old); $ I ++) {$ new [] = $ old [$ I] ["cnname"];} var_dump ($ new );

Array_column ($ array, 'key') returns a specified column in the array, which can be used to extract a column of a two-dimensional array and make a one-dimensional array (more than 5.5 can be used)
Who knows, my own notes ~ Encountered in the project ..

array_map(function($a){return $a['cnname']},$arr)