A function is a sequence of program instructions that perform a specific task. It is packaged as a unit that can be used wherever the according task should be performed.
Definition
A function is a sequence of program instructions that perform a specific task. It is packaged as a unit that can be used wherever the according task should be performed.
PHP Example
The following PHP function, for instance located in the file functions.php, prints the blog name with a certain formatting (in this case: bold and red) anywhere we call it:
function styled_blog_name() {
echo '<b style="color:red;">' . bloginfo('name') . '</b>';
}
Usage:
<p>Welcome to <?php styled_blog_name(); ?>!</p>
JavaScript Example
The following JavaScript function, for instance located in an included JS file, performs a redirect to WordPress Answers:
function WPSE() {
window.location = "http://wordpress.stackexchange.com";
}
Usage:
<a href="#" onclick="WPSE();">Visit WordPress Answers</a>
