Return a string with all the different characters used in "Hello World!" (mode 3):
The count_chars() function returns information about characters used in a string (for example, how many times an ASCII character occurs in a string, or which characters that have been used or not been used in a string).
| Parameter | Description |
|---|---|
| string | Required. The string to be checked |
| mode | Optional. Specifies the return modes.
0 is default. The different return modes are:
|
| Return Value: | Depending on the specified mode parameter |
|---|---|
| PHP Version: | 4+ |
Return a string with all the unused characters in "Hello World!" (mode 4):
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:
Another example of counting how many times an ASCII character occurs in a string:
Complete PHP String Reference
The perfect solution for professionals who need to balance work, family, and career building.
More than 10 000 certificates already issued!
The HTML Certificate documents your knowledge of HTML.
The HTML5 Certificate documents your knowledge of advanced HTML5.
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).
Your message has been sent to W3Schools.