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---
title: PHP Syntax
---
# Basic PHP Syntax
### Start
All PHP files are saved by the extension ` .php ` . PHP scripts can be added anywhere in the document. A PHP script starts with ` <?php ` and ends with ` ?> ` .
` <?php //PHP code goes here ?> `
### Print
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To print any statement in PHP we use `echo` command.
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#### Code sample
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```php
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<!DOCTYPE html>
< html >
< body >
< h1 > My first PHP page< / h1 >
< ?php
echo "Hello World!";
?>
< / body >
< / html >
```
##### NOTE: PHP statements ends with semicolon `;`
### Declaring Variables
We declare variables in PHP by adding dollar `$` sign before them.
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```php
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< ?php
$x = 5;
echo $x;
?>
```
### Comments in PHP
To write a single line comment in PHP we put hashtag `#` or by putting `//` before the comment.
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```php
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< ?php
# This is a single line comment
// This is also a single line comment
?>
```
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To write a multiple line comment we start the comment with `/*` and end with `*/` .
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```php
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< ?php
/* This is a
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Multiple line comment. */
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?>
```
We can also comment out some parts of the code line.
#### Code Sample
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```php
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<!DOCTYPE html>
< html >
< body >
< ?php
// You can also use comments to leave out parts of a code line
$x = 5 /* + 15 */ + 5;
echo $x;
?>
< / body >
< / html >
```
You can see more about this on [PHP Manual ](http://php.net/manual/en/ )
