PHP array_column() Function

PHP array_column() Function

The array_column() function in PHP is used to return the values from a single column specified in the input array.

Syntax

array_column (array $input, mixed $column_key [, mixed $index_key])

Parameter

input(required)- This parameter represents a multi-dimensional array or an array of objects from which the column of values will be pulled from.

column_key(required)- This parameter signifies the column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or property name. 

index_key(optional)- It signifies the column to use as the index/keys for the returned array. The default value is null.

Return

This function returns an array of values representing a single column from the input array.

Example 1

 '15cs1029',
         'first_name' => 'Reema',
         'last_name' => 'Panda',
     ), 
     array(
         'id' => '15cs1011',
         'first_name' => 'Arnavi',
         'last_name' => 'Patra',
          )
 ); 
 // will return the value for the first name column.
 $first_names = array_column($records, 'first_name');
 echo("The First Names of the students are as follows:\n");
 print_r($first_names);
 // will return the value for the last name column.
 $last_names = array_column($records, 'last_name');
 echo("\nThe Last Names of the students are as follows:\n");
 print_r($last_names);
 ?> 

Output

The First Names of the students are as follows:
 Array
 (
     [0] => Reema
     [1] => Arnavi
 )
 The Last Names of the students are as follows:
 Array
 ( 
     [0] => Panda
     [1] => Patra
 ) 

Example 2

 '15cs1029',
         'first_name' => 'Reema',
         'last_name' => 'Panda',
     ), 
     array(
         'roll_no' => '15cs1011',
         'first_name' => 'Arnavi',
         'last_name' => 'Patra',
          )
 ); 
 //will return roll_no as keys and first_name as values
 $values = array_column($records, 'first_name', 'roll_no');
 print_r($values);
 ?> 

Output

Array
 (
     [15cs1029] => Reema
     [15cs1011] => Arnavi
 ) 

Example 3

 array(  "Nickname" => "Reem", "country" => "India","Nationality"=>"Indian" ),  
  "Varun" => array(  "Nickname" => "Garo", "country" => "India","Nationality"=>"Indian" )  );  
 $nickname = array_column($arr, 'Nickname');  
 // will return the values for column nickname
 print_r($nickname);  
 ?>   

Output

Array
 (
     [0] => Reem
     [1] => Garo
 ) 

Example 4

 array(  "Nickname" => "Reem", "country" => "India","Nationality"=>"Indian" ),  
  "Varun" => array(  "Nickname" => "Garo", "country" => "India","Nationality"=>"Indian" )  );  
 $nickname = array_column($arr, 'last_name');  
 // will return the null as the last_name column is not present in the array
 print_r($nickname);  
 ?>   

Output

Array
 (
 )