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PHP: count() function

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PHP: Count all elements in an array

The count() function is used to count the elements of an array or the properties of an object.

Note: 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.

Version

(PHP 4 and above)

Syntax

count(array_name, mode) 

Parameters

Name Description Required /
Optional
Type
array_name Specifies the array or object to count. Required Array
mode Sets the mode of the function.
Possible values :
COUNT_RECURSIVE (or 1) : here the count() function counts the array recursively. This is useful for counting all the elements of a multidimensional array.
The default value is 0.
Optional Integer

Return value

The number of elements in array_name.

Value Type : Array.

Note : The count() function may return 0 for a variable which is not set, but it may also return 0 for a variable that has been initialized with an empty array. The isset() function should be used to test whether a variable is set or not.

Pictorial Presentation :

php array count() function

Example :

<?php
$a[0] = 'Language';
$a[1] = 'English';
$a[2] = 'Math';
$a[3] = 'Science';
$result = count($a);
echo $result;
?>

Output :

4

View the example in the browser

Practice here online :


See also

PHP Function Reference



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