this small code helps the beginners to understand how php interacts with the html forms
see the example at:
http://members.lycos.co.uk/nharsha/form.phpBy : harsha
<html>
<head>
<!--coded by: harsha send your comments to: nharsha@lycos.com-->
<title>php and html forms and interaction between them</title>
</head>
<body>
<?
/*
Parent if statement checking the if $HTTP_POST_VARS['submit'] is true or not and
if it is true it proceeds futher for the execution of the inner statements in it
$HTTP_POST_VARS is an php variable where the form elements are stored in it as array elements
here we have three form variables:
name field:$name -------> the value of this is stored as an array element
$HTTP_POST_VARS['name']
subject field: $subject -------> the value of this is stored as an array element
$HTTP_POST_VARS['subject']
message field: $message -------> the value of this is stored as an array element
$HTTP_POST_VARS['message']
submit button: $submit -------> the value of this is stored as an array element
$HTTP_POST_VARS['submit']
(here in the sumit the value stored is either 1 or 0)
note:instead of $HTTP_POST_VARS['SUBMIT']
we can use the following code:
say instead of using .........
if($HTTP_POST_VARS['submit']) ......
we can use .........
if(isset==$submit||$submit == "add")
*/
if($HTTP_POST_VARS['submit']){
//note that empty() is an built in function
//below if statement checks the whether name feild is empty or not
if(empty($name)){
echo "<font color=\"red\" size=\"+2\">Please enter your name!!</font><br>";
}
//below if statement checks the subject feild
if(empty($subject)){
echo "<font color=\"red\" size=\"+2\">The subject feild is empty!!</font><br>";
}
//below if statement checks the message feild
if(empty($message)){
echo "<font color=\"red\" size=\"+2\">You did not enter the message!!</font><br>";
}
//this is an important statement it uses negetive condition
/*That is IF NAME "AND" SUBJECT "AND" MESSAGE IS "NOT" EMPTY THEN PROCEED FURTHER*/
if(!empty($name)&&!empty($subject)&&!empty($message))
{
//htmlspecialchar disables the html input
$new_name=htmlspecialchars($name);
//nl2br function converts newline character to break of html
$new_message=nl2br($message);
/*note that these htmlspecialchars and nl2br are the built in functons of php language*/
echo "<font color=\"red\" size=\"+2\">Thank you very much</font><br>";
echo "<br>".$new_name."<br>".$subject."<br>".$new_message;
}
}
//end of if
echo "
<form method=post action=/php/quth.php>
<br>
<b>name:</b><br><input type=\"text\" name=\"name\"><br>
<b>subject:</b><br><input type=\"text\" name=\"subject\"><br>
<b>message:</b><br><textarea name=\"message\" cols=\"20\" row=\"50\"></textarea>
<input type=\"submit\" name=\"submit\" value=\"add\"> ";
?>
</form>
</body>
</html>
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