2. Variables in PHP

We create Variable ( variable ) to store values ​​temporarily when a program is operating . Variables that we can load value , such as String, Number, Array .
Creating Variable
Creating Variable in PHP must abide by the following principles :
. Start by $
. Variable names can (az, AZ, 0-9, and _)
Note : Variable names can not begin with numbers .
Here is a method of creating Variable in PHP

<?php

  $var_name = value;

?>

Example: Declaring variables in PHP

<?php

  $txt = 'Hello World';     // String

  $str = "itkonkhmer";     // String

  $x=16;                    // Integer

  $y = 15.10;              // Double

?>

Note: Variable data in PHP is based on the value we give it.

Type Casting

- Cast to String: Convert Variable to String

<?php

  $x= 6;            // Integer

  (string) $x;          // $x is String

?>

- Cast to Integer: Convert Variable to Integer

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<?php   $str = '6';  // String  (integer) $str;  // $str now is Integer  // or (int) $str;  $x = 10.50;  // Double  (integer) $x;   //$x now is Integer ?>

- Cast to Float: Convert Variable to Double

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<?php   $x = 6;           // Integer   (float) $x;           // $x now is float ?>

- Cast to Boolean: Convert Variable to Boolean

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<?php   $x = 1;   $y = 0;         $bool1 = (bool) $x;   $bool2 = (bool) $y;   var_dump($bool1);   var_dump($bool2); ?> results 1 2 bool(true) bool(false) Settype() Settpype () Function used to Convert Variables. Syntax: ? 1 2 3 <?php    Settype($var_name,stringdatatype); ?> example ? 1 2 3 4 <?php   $x = 20.25;<br>  settype($x,"integer");   echo $x;<br>  // result : 20 ?> Gettype() Gettype () Function Return String data type Variable. ? 1 2 3 4 <?php   $x = 20.25;<br>  echo gettype($x) . "<br/>";   $str = "Hello";<br>  echo gettype($str); ?> Result ? 1 2 double string Var_dump() var_dump () Function to return the String Data type and value of the variable. <?php   $x = 20.25;<br>  $str = "Hello";   $bool = true;<br>  echo var_dump($x) . "<br/>";   echo var_dump($str) . "<br/>";   eho var_dump($bool); ?> Result float(20.25) string(5) "Hello" bool(true)