User Defined Function in PHP
A user defined function declaration starts with the word “function”:
Syntax
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function functionName() { code to be executed; } |
Note: A function name can start with a letter or underscore (not a number).
Tip: Give the function a name that reflects what the function does!
Function names are NOT case-sensitive.
In the example below, we create a function named “writeMsg()”. The opening curly brace ( { ) indicates the beginning of the function code and the closing curly brace ( } ) indicates the end of the function. The function outputs “Hello world!”. To call the function, just write its name:
Example
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<?php function writeMsg() { echo "Hello world!"; } writeMsg(); // call the function ?> |