{"id":51,"date":"2021-03-07T16:11:22","date_gmt":"2021-03-07T16:11:22","guid":{"rendered":"https:\/\/phptutorial.net\/?page_id=51"},"modified":"2025-04-05T13:59:45","modified_gmt":"2025-04-05T13:59:45","slug":"php-syntax","status":"publish","type":"page","link":"https:\/\/www.phptutorial.net\/php-tutorial\/php-syntax\/","title":{"rendered":"PHP Syntax"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn basic PHP syntax, including case sensitivity, statements, and whitespaces.<\/p>\n\n\n\n

As a programming language, PHP has a set of rules that govern how you write programs.<\/p>\n\n\n\n

PHP code #<\/a><\/h2>\n\n\n\n

Like HTML, you need to have the opening tag to start PHP code:<\/p>\n\n\n

<?php<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
If you mix PHP code with HTML, you need to have the enclosing tag:<\/p>\n\n\n
?><\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
For example:<\/p>\n\n\n
<!DOCTYPE html>\n<html lang=\"en\"<\/span>>\n<head>\n    <meta charset=\"UTF-8\"<\/span>>\n    <title>PHP Syntax<\/title>\n<\/head>\n<body>\n        <h1><?php<\/span> echo<\/span> 'PHP Syntax'<\/span>; ?><\/span><\/h1>\n<\/body>\n<\/html><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
However, if a file contains only PHP code, the enclosing tag is optional:<\/p>\n\n\n
<?php<\/span>\n\techo<\/span> 'PHP Syntax'<\/span>;<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Case sensitivity #<\/a><\/h2>\n\n\n\n
PHP is partially<\/strong> case-sensitive. Knowing what is case-sensitive and what is not is very important to avoid syntax errors.<\/p>\n\n\n\n
If you have a function such as count<\/code>, you can use it as COUNT<\/code>. It would work properly.<\/p>\n\n\n\n
The following are case-insensitive in PHP:<\/p>\n\n\n\n
Try it<\/a><\/p>\n\n\n\n