PHP’s syntax are similar to most of the other programming languages (C, Java, Perl) with the addition that all PHP code is contained within a tag. PHP code can be easily embed into your HTML code.
Four different ways to escaping to PHP:
<?php...?> //Canonical PHP tags
<?...?> //Short-open (SGML-style) tags
<%...%> //ASP-style tags
<script language="PHP">...</script> //HTML script tags
Note:- You can set the escaping option in your php.ini file.
Commenting in PHP Code:
# This is a single line comment
// This is a single comment too.
This is a comment with multiline
Test multiline commenting.
PHP Statement termination:
Every statement in PHP must be followed by a semicolon (;). Block of valid PHP statements that is enclosed by the PHP tags is a valid PHP program.
PHP Case sensitivity:
In PHP the user defined functions, classes, core language keywords (for example if, else, while, echo etc.) are case-insensitive. PHP variables are case-sensitive