W3Schools.com

PHP count_chars() Function

PHP String Reference Complete PHP String Reference

Definition and Usage

The count_chars() function returns how many times an ASCII character occurs within a string and returns the information.

Syntax

count_chars(string,mode)

Parameter Description
string Required. The string to be checked
mode Optional. Specifies the return modes. 0 is default. The different return modes are:
  • 0 - an array with the ASCII value as key and number of occurrences as value
  • 1 - an array with the ASCII value as key and number of occurrences as value, only lists occurrences greater than zero
  • 2 - an array with the ASCII value as key and number of occurrences as value, only lists occurrences equal to zero are listed
  • 3 - a string with all the different characters used
  • 4 - a string with all the unused characters

Example 1

In this example we will use count_chars() with mode 1 to check the string. Mode 1 will return an array with the ASCII value as key and how
many times it occurred as value (e.g. in the example below, the ASCII value for the letter "l" is 108, and it occurs three times):

<?php
$str = "Hello World!";
print_r(count_chars($str,1));
?>

The output of the code above will be:

Array
(
[32] => 1
[33] => 1
[72] => 1
[87] => 1
[100] => 1
[101] => 1
[108] => 3
[111] => 2
[114] => 1
)

Example 2

In this example we will use the count_chars() with mode 3 to check the string. Mode 3 will return a string with all the different characters used:

<?php
$str = "Hello World!";
echo count_chars($str,3);
?>

The output of the code above will be:

!HWdelor

PHP String Reference Complete PHP String Reference
W3Schools Certification

W3Schools' Online Certification

The perfect solution for professionals who need to balance work, family, and career building.

More than 10 000 certificates already issued!

Get Your Certificate »

The HTML Certificate documents your knowledge of HTML.

The CSS Certificate documents your knowledge of advanced CSS.

The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.

The jQuery Certificate documents your knowledge of jQuery.

The XML Certificate documents your knowledge of XML, XML DOM and XSLT.

The ASP Certificate documents your knowledge of ASP, SQL, and ADO.

The PHP Certificate documents your knowledge of PHP and SQL (MySQL).

WEB HOSTING
Best Web Hosting
PHP MySQL Hosting
Best Hosting Coupons
UK Reseller Hosting
Cloud Hosting
Top Web Hosting
$7.95/mo SEO Hosting
Premium Website Design
WEB BUILDING
Download XML Editor
FREE Website BUILDER
Free Website Templates Free CSS Templates
Make Your Own Website
W3SCHOOLS EXAMS
Get Certified in:
HTML, CSS, JavaScript, XML, PHP, and ASP
W3SCHOOLS BOOKS
New Books:
HTML, CSS
JavaScript, and Ajax
STATISTICS
Browser Statistics
Browser OS
Browser Display
SHARE THIS PAGE