Things to know about PHP

Here are quick note and little attention that you should know before writing project code in  PHP.

Basic PHP sysntax:


A PHP script starts with <?php and ends with ?>:
<?php
// Your PHP code goes here
?>
The default file extension for PHP files is ".php".

Note:  All statements must end in a semicolon ( ; )! Otherwise, errors will be
generated. If the error doesn't make sense, you probably are missing a
semicolon somewhere!

Comments in PHP

A comment in PHP code is a line that is not read/executed as part of the program. Its only purpose is to be read by someone who is looking at the code.

Example on PHP comments:

<!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 in your project
*/

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

</body>
</html>

The output of the above code will be 30. (x = 15+15)

PHP case sensitive

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 below are legal (and equal):

<!DOCTYPE html>
<html>
<body>

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

</body>
</html>


Formatting Characters in PHP

\n– New line
\r– Carriage return
\t– Tab
\b– Backspace


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