array_column(3) [php man page]

ARRAY_COLUMN(3) 							 1							   ARRAY_COLUMN(3)

array_column - Return the values from a single column in the input array

SYNOPSIS

       array array_column (array  $array, mixed  $column_key, [mixed  $index_key = null])

DESCRIPTION

       array_column(3)	returns  the  values  from  a  single  column of the $array, identified by the $column_key. Optionally, you may provide an
       $index_key to index the values in the returned array by the values from the $index_key column in the input array.

PARAMETERS

	      o $array
		- A multi-dimensional array (record set) from which to pull a column of values.

	      o $column_key
		- The column of values to return. This value may be the integer key of the column you wish to retrieve, or it may  be  the  string
		key  name  for an associative array. It may also be NULL to return complete arrays (useful together with $index_key to reindex the
		array).

	      o $index_key
		- The column to use as the index/keys for the returned array. This value may be the integer key of the column, or it  may  be  the
		string key name.

RETURN VALUES

	Returns an array of values representing a single column from the input array.

EXAMPLES

       Example #1

	      Get column of first names from recordset

	      <?php
	      // Array representing a possible record set returned from a database
	      $records = array(
		  array(
		      'id' => 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);
	      ?>

	      The above example will output:

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

       Example #2

	       Get column of last names from recordset, indexed by the "id" column

	      <?php
	      // Using the $records array from Example #1
	      $last_names = array_column($records, 'last_name', 'id');
	      print_r($last_names);
	      ?>

	      The above example will output:

	      Array
	      (
		  [2135] => Doe
		  [3245] => Smith
		  [5342] => Jones
		  [5623] => Doe
	      )

PHP Documentation Group 													   ARRAY_COLUMN(3)

Check Out this Related Man Page

UASORT(3)								 1								 UASORT(3)

uasort - Sort an array with a user-defined comparison function and maintain index association

SYNOPSIS

       bool uasort (array  &$array, callable  $value_compare_func)

DESCRIPTION

	This  function sorts an array such that array indices maintain their correlation with the array elements they are associated with, using a
       user-defined comparison function.

	This is used mainly when sorting associative arrays where the actual element order is significant.

       Note

	       If two members compare as equal, their relative order in the sorted array is undefined.

PARAMETERS

	      o $array
		- The input array.

	      o $value_compare_func
		- See usort(3) and uksort(3) for examples of user-defined comparison functions.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Basic uasort(3) example

	      <?php
	      // Comparison function
	      function cmp($a, $b) {
		  if ($a == $b) {
		      return 0;
		  }
		  return ($a < $b) ? -1 : 1;
	      }

	      // Array to be sorted
	      $array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
	      print_r($array);

	      // Sort and print the resulting array
	      uasort($array, 'cmp');
	      print_r($array);
	      ?>

	      The above example will output:

	      Array
	      (
		  [a] => 4
		  [b] => 8
		  [c] => -1
		  [d] => -9
		  [e] => 2
		  [f] => 5
		  [g] => 3
		  [h] => -4
	      )
	      Array
	      (
		  [d] => -9
		  [h] => -4
		  [c] => -1
		  [e] => 2
		  [g] => 3
		  [a] => 4
		  [f] => 5
		  [b] => 8
	      )

SEE ALSO

       usort(3), The comparison of array sorting functions.

PHP Documentation Group 														 UASORT(3)

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array_column(3) [php man page]

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