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array_column()

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<?php
$array 
array_column (
    
// array $array
    
// mixed $column_key
    
  // [mixed $index_key = null]
);
?>
Result
$array = [
  
=> 'John',
  
=> 'Sally',
  
=> 'Jane',
  
=> 'Peter',
]
Examples
#1 array_column  ([=> ["id" => 2135"first_name" => "John""last_name" => "Doe"], => ["id" => 3245"first_name" => "Sally""last_name" => "Smith"], => ["id" => 5342"first_name" => "Jane""last_name" => "Jones"], => ["id" => 5623"first_name" => "Peter""last_name" => "Doe"]],
 
"first_name")
#2 array_column  ([=> ["id" => 2135"first_name" => "John""last_name" => "Doe"], => ["id" => 3245"first_name" => "Sally""last_name" => "Smith"], => ["id" => 5342"first_name" => "Jane""last_name" => "Jones"], => ["id" => 5623"first_name" => "Peter""last_name" => "Doe"]],
 
"first_name",
 
"id")