PHP variable

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What is a PHP variable?
Variables are "containers" for storing data, like string of text, numbers, etc

What to know about variables:
In PHP, a variable does not need to be declared before adding a value.
After declaring a variable, it can be reused in full code.
Always start with "$" without quotes, followed by the variable name, then an "equal sign" (=), and followed the text included in quotation marks with ("), followed by ( ;) as a command end.

If we assign numbers to the variable, we do not have to add quotes

Syntax:

In PHP variable can be declared as: $myvar_name = value;

<?php

  // Declaring variables as text

  $txt1 = "Hi, this is my variable!";

  $txt2 = "Hi, this is another text variable!";
// Declaring variables as numbers

  $number1 = 7;

  $number2 = 19;

  $number3 = 247;


// Displaying variables value

  echo $txt1;   echo "<br />";  // Output: Hi, this is my variable! 

  echo $txt2;  echo "<br />";  // Output: Hi, this is another text variable! 
echo $number1;  echo "<br />"; // Output: 7

  echo $number2;  echo "<br />"; // Output: 19 

  echo $number3;  echo "<br />"; // Output: 247 

  ?>
        

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Tags: php variable: in string, type, variables, scope, naming conventios, number of parameters, in javascript, declaration, inside string,
What is a PHP variable?
How do you declare a PHP variable?
What is PHP and $$ variables?
How do you call a variable in PHP?

A method to interpolate a PHP variable with string literal by assigning the string literal to a variable.

 <?php
$txt1 = "sweet";

  echo "{$txt1}ened";
echo "<br /> ---------------------------- <br />";
$prefix1 = "Comfort";

  $suffix1 = "able";

  echo "{$prefix1}{$suffix1}";
echo "<br /> ---------------------------- <br />";
$my_number = '56789';
// This works:

  echo "qer{$my_number}rty <br />"; // qer56789rty, using braces

  echo "qer" . $my_number . "rty"; // qwe12345rty, concatenation used
echo "<br /> ++++++++++++++++++++++++++++++++++++ <br />";
// Does not work:

  echo 'qwe{$my_number}rty <br />'; // qwe{$a}rty, single quotes are not parsed

  echo "qwe$my_numberrty"; // qwe, because $a became $arty, which is undefined
?>
      

In the next example Variable($my_car) hold value="Ford Mondeo". Now we concatenate variable with string. pass this variable($my_car) inside echo statement. To concatenate this with a string("is riding") use dot(.) between variable name and string. The output will be displayed : Ford Mondeois riding

<?php
 $my_Car = "Ford Mondeo";
 echo $my_Car." is riding";
?>