PHP default file extension and comment statement

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The default file extension for PHP files is ".php".

PHP files usually contain HTML tags and some PHP script code.

Below, we provide a simple example of a PHP file that outputs the text "Hello World!" to the browser:

Each line of code in PHP must end with a semicolon. A semicolon is a delimiter that distinguishes an instruction set.

With PHP, there are two basic instructions for outputting text in a browser: echo and print.

Comments in PHP

The single-line comment is: / /

The multiline comment is: / * /

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