Undefined index and variable

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November 30th, 2003, 07:55 AM

aqua

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Join Date: Nov 2003

Posts: 2

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Undefined index and variable

Hi all,

When I first load the file, an error msg of undefined index: guess pop up. After the first guess, the error msg is gone.

Another problem, the num_tries won't increment.

Can anybody help me to solve these problem?

<?php
$num_to_guess = 42;
Static $num_tries = 0;
$num_tries = (isset($_POST["num_tries"])) ? $num_tries+=1 : 0;
$message = "";
if (!isset($_POST["guess"])) {
$message = "Welcome to the guessing machine!";
} elseif ($_POST["guess"] > $num_to_guess ) {
$message = "$_POST[guess] is too big! Try a smaller number";
} elseif ($_POST["guess"] < $num_to_guess ) {
$message = "$_POST[guess] is too small! Try a larger number";
} else { // must be equivalent
$message = "Well done!";
}
$guess = (int) $_POST["guess"];
?>
<html>
<body>
<h1>
<?php print $message ?>
</h1>
Guess number: <?php print $num_tries?>
<form action="<?php print $_SERVER["PHP_SELF"] ?>" method="POST">
Type your guess here:
<input type="text" name="guess" value="<?php print $guess?>">
<input type="hidden" name="num_tries" value="<?php print $num_tries?>">
</form>
</body>

Thx a lot!
aqua

November 30th, 2003, 11:16 AM

Bruski

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Join Date: Jul 2003

Location: Toronto, Canada

Posts: 192

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i would do it in a loop much more efficent

November 30th, 2003, 11:03 PM

MadCowDzz

I'm Internet Famous

Dev Articles Frequenter (2500 - 2999 posts)

Join Date: Jan 2003

Location: Toronto, Canada

Posts: 2,890

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The message you're getting is only a warning. Most production servers have these types of warnings turned off...

However, an easy way to fix this would be to put the entire bulk of the program into an if statement...

I would re-write your code like this:

PHP Code:


		
			
<?php 

Static $num_tries = 0; 

$num_to_guess = 42; 

$guess = (int) $_POST["guess"]; 

$message = ""; 



if (isset($_POST['guess'])) { 

    $num_tries = (isset($_POST["num_tries"])) ? $num_tries+=1 : 0; 

    if (!isset($_POST["guess"])) { 

    $message = "Welcome to the guessing machine!"; 

    } elseif ($_POST["guess"] > $num_to_guess ) { 

    $message = "$_POST[guess] is too big! Try a smaller number"; 

    } elseif ($_POST["guess"] < $num_to_guess ) { 

    $message = "$_POST[guess] is too small! Try a larger number"; 

    } else { // must be equivalent 

    $message = "Well done!"; 

    } 

} 



?> 

<html> 

<body> 

<h1> 

<?php print $message ?> 

</h1> 

Guess number: <?php print $num_tries?> 

<form action="<?php print $_SERVER["PHP_SELF"] ?>" method="POST"> 

Type your guess here: 

<input type="text" name="guess" value="<?php print $guess?>"> 

<input type="hidden" name="num_tries" value="<?php print $num_tries?>"> 

</form> 

</body> 

</html>

December 5th, 2003, 07:59 AM

aqua

Junior Member

Join Date: Nov 2003

Posts: 2

Time spent in forums: < 1 sec
Reputation Power: 0

Increment problem!

The problem on incrementing num_tries. Anybody knows how to solve it?

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