PHP4 User Manual: function-count

Source: Internet
Author: User
Tags manual
TABLE border = 0 cellPadding = 0 cellSpacing = 0 height = "100%" width = "100%">
 
(PHP 3, PHP 4> = 4.0.0)
Count -- calculates the number of elements in a variable.
Description
 
Int count (mixed var)
 
Returns the number of var elements of a variable. The most representative is an array (other types only have one element ).
If the var variable is not an array, 1 (except: count (NULL) is equivalent to 0) is returned ).
 
Warning
Count () may return 0 for an unspecified variable, but it can also return 0 for an initialized empty array. If you want to check whether a variable is set, use the isset () function.
 
For array implementation and use of PHP in arrays, see the array section in the manual.
Example 1. count ()
$ A [0] = 1;
$ A [1] = 3;
$ A [2] = 5;
$ Result = count ($ );
// $ Result = 3
$ B [0] = 7;
$ B [5] = 9;
$ B [10] = 11;
$ Result = count ($ B );
// $ Result = 3;
 
Note: The sizeof () function is an alias of count ().
See sizeof (), isset (), and is_array ().
 

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.