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PHP is a server-side, cross-platform, HTML embedded scripting language  that was developed in C and is designed for working with  relational database  systems. If you are completely new to PHP and want to get some idea of  how it works, have a look at the Introductory  Tutorial at www.php.net. Once you get beyond that have a look at the  example archive sites and some of the other resources available in their Projects section.

A PHP program is embedded directly in the HTML document. It must  have  a .phtml or .php3 or .php extension in order for the server to look for  PHP code in the document. Here is an example of how you embed the PHP:



insert PHP code here



Here is a sample PHP program shown accessing a MySQL  database.

Note, you MUST have the <? at the begining and ?> at the end.  PHP coding will not be displayed when someone views the source code  of  your file through their browser if done correctly.


mysql_connect ("localhost" , "username" , "password");
$query =  mysql_db_query("michael", "SELECT first_name from children");
$result = mysql_fetch_row($query);
$i = 0;
$check = 0;
while ($i  if ($first == $result[0]){
$check = 1;
if ($check == 1) {
$i = mysql_num_rows ($query) + 1;
echo "You've already made a guess!!";
$result = mysql_fetch_row($query);
if ($check == 0) {
mysql_db_query("michael","INSERT INTO children
(last_name, first_name, kids, sex)
('$last', '$first', '$numb', '$gender')");


 To merely display the information  in your database:

<P>These are the products I sell:</P>


mysql_connect(localhost, username, password);
$result = mysql(mydatabase, "select * from products");
$num = mysql_numrows($result);
$i = 0;

while($i < $num) {
echo "<TR>n";
echo "<TD>n";
echo mysql_result($result,$i,"prodid");
echo "</TD>n<TD>";
echo mysql_result($result,$i,"name");
echo "</TD>n<TD>";
echo mysql_result($result,$i,"price");
echo "</TD>n";
echo "</TR>n";

Thus having the loop in the php program create a table with the  products listed. NOTE your username and password for the  database are not  written in the file when it's displayed on the Internet so users viewing  the source of your webpage will not see your password.

When using a CGI script to pull information  from a form which  has been submitted by a browser you must have the first line of the script  have this command on it (Much like perl scripts):


For detailed  information regarding PHP, you can go to their online  manual: http://www.php.net/manual. PHP.net  has many links to examples and scripts. There is also a mailing list  to interact with other PHP users where you can ask questions and find useful  scripts and bits of code. You will also find books  available for  learning PHP.

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