Full Stack Web Development

15.5    Functions and Error Handling

Almost every programming language contains functions, and PHP is no exception, to generate recurring parts of code.

15.5.1    Defining Functions

A function must be introduced via the function keyword, followed by the parentheses, in which the parameters can be entered. After that, the statements to be executed are inside the curly brackets. Listing 15.28 shows an example. Embedded within the function is the while example from Section 15.4.2. The function is called with its function name followed by two parentheses.

<?phpfunction printNumbersFrom1To10() {   $i = 1;   while ( $i <= 10 ) {      echo $i ++;   }}printNumbersFrom1To10(); 

Listing 15.28     Defining and Executing a Function

15.5.2    Function Parameters