PHP Variables | Variables in PHP language - PHP Tutorial 18

ChidresTechTutorials منتشر شده در تاریخ 1398/05/25

2.4 هزار بار بازدید - 5 سال پیش - Notes for You:: PHP Variables.-

Notes for You:: PHP Variables.
- Variable is a named memory location, whose value may change during the execution of a program.

- While building any web application (ex. banking, game etc.) we come across variety of data and data values.
- According to the requirement of the application we should be able to store and process them.
- To store and process data and data values we should be able to grab computer memory locations and access them within a script.

- To grab a chunk of memory and access it within the script, we need to declare a variable or a constant.

Declaring a variable or a constant:
- means allocating a memory location for some data

Initializing a variable or a constant:
- means putting an initial data value within that allocated memory location

- In order to change the value in a variable or constant, we need to assign a new value to it.

Assigning a variable or a constant:
- means putting a new data value within that allocated memory location

Syntax:
// declaration and initialization of a variable
$nameOfVariable=initial value;

// assigning new value to a variable
$nameOfVariable = new value;

Note:
- Variables must be initialized, before using them.
- Like in other langauges; No comma separated variable or constants allowed.
- While accessing a variable directly within a string, it’s recommended to enclose a variable within {}

Example Code:

<?php

$playerName = "Manjunath";
echo $playerName," ";

$playerScore = 0;
echo $playerScore," ";
$playerScore=20;
echo $playerScore," ";
echo " ";

echo "Player name= ",$playerName," ";
echo "Player score= ",$playerScore," ";

$isGameOver; // you can declare
$isGameOver = true; // but must initialize
echo $isGameOver," "; // to use it
echo " ";

$a,$b; // error

echo "Player name= $playerName"," ";
echo "Player name= {$playerName}"," ";

?>

Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.

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Follow the link for next video:
PHP Tutorial 19 - Constants in PHP language | PHP Constants Tutorial
PHP Constants | Constants in PHP lang...

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PHP Tutorial 17 - PHP Identifiers | PHP Naming Conventions
PHP Identifiers | Identifiers in PHP ...

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5 سال پیش در تاریخ 1398/05/25 منتشر شده است.

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