PHP Functions

Function A function is a special piece of code that you can call to do something complicated. A function has a name, it is passed one or more parameters and it returns a result.
Making a Function Before you can call a function, you must make it, like this: 
function make_bold($s) {
    return "<b>" . $s . "</b>";     // return passed the result back
}
Calling a Function Once the function is made, you can call it: 
$bold_string = make_bold($string);
echo make_bold($string);
Built-in Functions There are many built-in functions for manipulating strings and arrays, dates and time, math, and many other things. Here are a few examples: 
$array = array(1,2,3);
if (count($a) > 0) echo "array is not empty";
if (strcmp($answer, "yes") == 0) echo "answer was yes";
$random = rand(0,10);

Home