PHP Variables

PHP Programming

PHP variables must have $ code before the variable. Example:

<?php
$myString = "Hello world!";
$myInt = 5;
$myFloat = 10.5;
?>

A variables above is myString for Hello World! as String, myInt for 5 as integer and myFloat for 0.5 as float.

Note :
A variable must same with variable's string that's created, because if not same with variable string that's created first although that's type is same but has different of the format of variable like uppercase, etc., the variable can't be used. Example :

<!DOCTYPE html>
<html>
        <head>
        <meta charset="UTF-8">
        <title>DEV</title>
    </head>
    <body>
        <?php
        $color = "black";
        echo "My phone is . $color<br>";
        echo "My phone is . $Color<br>";
        echo "My phone is . $cOLOR<br>";
        ?>
    </body>
</html>

This example can't run because the variable of color has a three different variables.

PHP Global and Scope

The variable in outside the function has a global scope and can be accessed outside the function. Example :

        <?php
        $a = 10;
        function myfunction() {
            echo "The value of variable a is $a";
        }
        myfunction();
        echo "The value of variable a is $a";
        ?>

The variable in inside the function has a local scope and can only accessed within the function. Example :

        <?php
        function myfunction() {
            $a = 10;
            echo "The value of variable a is $a";
        }
        myfunction();
        echo "The value of variable a is $a";
        ?>

PHP The Global Keyword

The global keyword is used to access the variable within the function. Example:

        <?php 
        $a=10;
        $b=15;
        function myfunction(){
            global $a,$b;
            $b=$a+$b;
        }
        myfunction();
        echo $b;
        ?>

PHP also stores all global variable in array with $GLOBALS['index']. the $GLOBALS['index'] is saves a variable for access the function. Example :

        <?php
        $a = 10;
        $b = 15;
        function myfunction() {
            $GLOBALS['b'] = $GLOBALS['a'] + $GLOBALS['b'];
        }
        myfunction();
        echo $b;
        ?>

PHP Static Keyword

If the function is executed, the variable is deleted. To do this, you must use the static keyword when you first declare the variable. Example :

        <?php
        function myfunction() {
            $a = 0;
            echo $a;
            $a++;
        }
        myfunction();
        myfunction();
        myfunction();
        myfunction();
        ?>

PHP Variables

By Solve Program

PHP Variables

PHP variables must have $ code before the variable. Example:

PHP Global and Scope

PHP The Global Keyword

PHP Static Keyword

Programming Language

Data Structure

PHP Variables

By Solve Program

PHP Variables

PHP variables must have $ code before the variable. Example:

PHP Global and Scope

PHP The Global Keyword

PHP Static Keyword

Related Solving and Tutorial:

Programming Language

Data Structure