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Syntax Of PHP



Escaping to PHP

The PHP parsing engine needs a way to differentiate PHP code from other elements in the page. The mechanism for doing so is known as 'escaping to PHP'. There are four ways to do this −

Canonical PHP tags

The most universally effective PHP tag style is −
<?php...?>
If you use this style, you can be positive that your tags will always be correctly interpreted.

HTML script tags

HTML script tags look like this −
<script language = "PHP">...</script>

PHP is whitespace insensitive



Whitespace is the stuff you type that is typically invisible on the screen, including spaces, tabs, and carriage returns (end-of-line characters).



PHP whitespace insensitive means that it almost never matters how many whitespace characters you have in a row.one whitespace character is the same as many such characters.



For example, each of the following PHP statements that assigns the sum of 2 + 2 to the variable $four is equivalent −


$four = 2 + 2; // single spaces
$four <tab>=<tab2<tab>+<tab>2 ; // spaces and tabs
$four =
2+
2; // multiple lines



PHP is case sensitive






<html>
   <body>
      
      <?php
         $capital = 67;
         print("Variable capital is $capital<br>");
         print("Variable CaPiTaL is $CaPiTaL<br>");
      ?>
      
   </body>
</html>



This will produce the following result −


Variable capital is 67
Variable CaPiTaL is

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