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Randell Dawson 0a1eeea424 fix(guide) Replace invalid prism code block names (#35961 )

* fix: replace sh with shell

fix replace terminal with shell

fix replace node with js

fix replace output with shell

fix replace cs with csharp

fix replace c++ with cpp

fix replace c# with csharp

fix replace javasctipt with js

fix replace syntax  with js

fix replace unix with shell

fix replace linux with shell

fix replace java 8 with java

fix replace swift4 with swift

fix replace react.js with jsx

fix replace javascriot with js

fix replace javacsript with js

fix replace c++ -  with cpp

fix: corrected various typos

fix: replace Algorithm with nothing

fix: replace xaml with xml

fix: replace solidity with nothing

fix: replace c++ with cpp

fix: replace txt with shell

fix: replace code with json and css

fix: replace console with shell

2019-05-15 19:08:19 +02:00

1.7 KiB

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Basic Syntax

Basic Syntax

A PHP script can be placed anywhere in the document.

A PHP script starts with <?php and ends with ?>

Below, we have an example of a simple PHP file, with a PHP script that uses a built-in PHP function "echo" to output the text "Hello World!" on a web page

<!DOCTYPE html>
<html>
<body>

<h1>My first PHP page</h1>

<?php echo "Hello World!"; ?>

</body>
</html>

The output of that would be :

My first PHP page

Hello World!

Note: PHP statements end with a semicolon (;).

Comments in PHP

PHP supports several ways of commenting:

<!DOCTYPE html>
<html>
<body>

<?php
// This is a single-line comment

# This is also a single-line comment

/*
This is a multiple-lines comment block
that spans over multiple
lines
*/

// You can also use comments to leave out parts of a code line
$x = 5 /* + 15 */ + 5;
echo $x;
?>

</body>
</html>

PHP Case Sensitivity

In PHP, all keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive.

In the example below, all three echo statements are legal (and equal):

<!DOCTYPE html>
<html>
<body>

<?php
ECHO "Hello World!<br>";
echo "Hello World!<br>";
EcHo "Hello World!<br>";
?>

</body>
</html>

However; all variable names are case-sensitive.

In the example below, only the first statement will display the value of the $color variable (this is because $color, $COLOR, and $coLOR are treated as three different variables):

<!DOCTYPE html>
<html>
<body>

<?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>

</body>
</html>

1.7 KiB Raw Blame History