Library tutorials & articles
An Introduction to PHP
Getting Started
PHP scripts have the extension .php. The PHP script is placed between the <?php and ?> delimiters. The script that is placed between these delimiters is
interpreted on the server into HMTL, before being sent to the client. The client
will receive a pure HTML page.
Comments
You can comment your code using C++ type comments. The following shows the syntax for inline comments (a comment on a single line), and block comments (comments placed over several lines).
// This is an inline comment
/*
This is a block comment
placed over two or more
lines
*/
Output
There are two basic statements to output text with PHP, either using echo, or print.
Output Using echo
The text to be outputed follows the echo statement.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Starting PHP</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<p>
<?php echo "Hello World<br>"; ?>
</p>
</body>
</html>
Output using print
The text to be outputed follows the print statement.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Starting PHP</title>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
</head>
<body>
<p>
<?php print "Hello World<br>"; ?>
</p>
</body>
</html>
PHP also offers a shothand way of outputting information, using the <?= and ?> delimiters. The following example prints the variable $name (passed from a form) to greet a user.
Hello <?=$name?>
PHP Information
The phpinfo function is useful for trouble shooting, providing the version of PHP, and how it is configured.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>PHP Information</title>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
</head>
<body>
<p>
<?php phpinfo();?>
</p>
</body>
</html>
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but i need to send values in one folder to another
Yes, I think you're correct, although you could easily have a line like this:
to get around that problem. Which I think is what's missing from this tutorial
In the PHP file should it be "$_POST["num"]" ?
instead of just $num?
I have in php a header which brings a save as box , but when file is down loaded it contains the 6 blank spaces at the start of of document .
I have to avoid storing these blank spaces.Please help me to solve this problem.
You can also do string concatenation like
$h = "Hello";
$w = "World";
$message = "$h $w";
This thread is for discussions of An Introduction to PHP.