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PHP

Count all elements in an array, or something in an object


count

(PHP 4, PHP 5)

countCount all elements in an array, or something in an object

Description

int count ( mixed $var [, int $mode = COUNT_NORMAL ] )

Counts all elements in an array, or something in an object.

For objects, if you have SPL installed, you can hook into count() by implementing interface Countable. The interface has exactly one method, Countable::count(), which returns the return value for the count() function.

Please see the Array section of the manual for a detailed explanation of how arrays are implemented and used in PHP.

Parameters

var

The array or the object.

mode

If the optional mode parameter is set to COUNT_RECURSIVE (or 1), count() will recursively count the array. This is particularly useful for counting all the elements of a multidimensional array. count() does not detect infinite recursion.

Return Values

Returns the number of elements in var. If var is not an array or an object with implemented Countable interface, 1 will be returned. There is one exception, if var is NULL, 0 will be returned.

Caution

count() may return 0 for a variable that isn't set, but it may also return 0 for a variable that has been initialized with an empty array. Use isset() to test if a variable is set.

Changelog

Version Description
4.2.0 The optional mode parameter was added.

Examples

Example #1 count() example

<?php
$a
[0] = 1;
$a[1] = 3;
$a[2] = 5;
$result count($a);
// $result == 3

$b[0]  = 7;
$b[5]  = 9;
$b[10] = 11;
$result count($b);
// $result == 3

$result count(null);
// $result == 0

$result count(false);
// $result == 1
?>

Example #2 Recursive count() example

<?php
$food 
= array('fruits' => array('orange''banana''apple'),
              
'veggie' => array('carrot''collard''pea'));

// recursive count
echo count($foodCOUNT_RECURSIVE); // output 8

// normal count
echo count($food); // output 2

?>

See Also

  • is_array() - Finds whether a variable is an array
  • isset() - Determine if a variable is set and is not NULL
  • strlen() - Get string length



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