Variables
Download as PPTX, PDF0 likes349 views
This document discusses variables in PHP. It defines variables as containers that store information, with PHP variables starting with $ followed by a name. Rules for variable names in PHP are provided, which must start with a letter or underscore, cannot start with a number, and can only include alphanumeric characters and underscores. The document also discusses global vs local variables and how the static keyword can be used to prevent local variables from being deleted after a function is executed. It notes that all global variables are also accessible via the $GLOBALS array from within functions.
![$GLOBALS[INDEX]
PHP also stores all global variables in an array
called $GLOBALS[index].The index holds the
name of the variable.This array is also accessible
from within functions and can be used to update
global variables directly.](https://image.slidesharecdn.com/variables-150402121436-conversion-gate01/85/Variables-10-320.jpg)
Variables
- 1. VARIABLES IN PHP Presenter: Suraj Motee
- 2. WHAT AREVARIABLES? Variables are "containers" for storing information. In PHP, a variable starts with the $ sign, followed by the name of the variable.
- 3. QUESTION: $x=3; $y=4; $x=$y; What is the final value of $x? How to output the value of $x?
- 4. RULES FOR PHPVARIABLES A variable starts with the $ sign, followed by the name of the variable A variable name must start with a letter or the underscore character A variable name cannot start with a number A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive ($age and $AGE are two different variables)
- 7. QUESTION: How to output the value of $x inside the function which has a global scope?
- 8. THE STATIC KEYWORD Normally, when a function is completed/executed, all of its variables are deleted. However, sometimes we want a local variable NOT to be deleted.We need it for a further job. To do this, use the static keyword when you first declare the variable
- 9. QUESTIONS? DOES STATIC MEANS LOCAL & GLOBAL? Verify the concept using local/global concepts.
- 10. $GLOBALS[INDEX] PHP also stores all global variables in an array called $GLOBALS[index].The index holds the name of the variable.This array is also accessible from within functions and can be used to update global variables directly.