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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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count

(PHP 3, PHP 4, PHP 5)

count -- Count elements in an array, or properties in an object

Description

int count ( mixed var [, int mode] )

Returns the number of elements in var, which is typically an array, since anything else will have one element.

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

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.

Note: The optional mode parameter is available as of PHP 4.2.0.

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. The default value for mode is 0. count() does not detect infinite recursion.

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.

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

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 >= 4.2.0)

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

// recursive count
echo count($food, COUNT_RECURSIVE); // output 8

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

?>

See also is_array(), isset(), and strlen().

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Another Useful functions:


zend-macro.zend-wrong-param-count | zend-api.zend-wrong-param-count | zend-api-macro.zend-wrong-param-count-with-retval | function.udm-get-doc-count | function.tidy-warning-count | function.tidy-error-count | function.tidy-config-count | function.tidy-access-count | function.sybase-deadlock-retry-count | function.swfsoundinstance.loopcount | function.substr-count | function.str-word-count | function.phar-count | function.pdostatement-rowcount | function.pdostatement-columncount | function.ocirowcount | function.newt-listbox-item-count | function.mysqli-warning-count | function.mysqli-stmt-param-count | function.mysqli-stmt-field-count | function.mysqli-param-count | function.mysqli-field-count | function.msession-count | function.mhash-count | function.mb-substr-count | function.maxdb-warning-count | function.maxdb-stmt-param-count | function.maxdb-param-count | function.maxdb-field-count | function.ldap-count-entries | function.iterator-count | function.hwapi-object-count | function.hwapi-error-count | function.gmp-popcount | function.geoip-country-name-by-name | function.geoip-country-code3-by-name | function.geoip-country-code-by-name | function.filepro-rowcount | function.filepro-fieldcount | function.count | function.count-chars | function.ccvs-count | function.arrayobject-count | function.array-count-values |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.