Re: Apache crashes when using WHILE loop to traverse SQL query results

by Bonger O :: Rate this Message:

Hi guys,

Thanks for getting back to me on this with your comments, but sadly I've still had no luck.

I have managed to narrow the problem down to $row = mysqli_fetch_assoc($result);

For some reason this is causing the crash. Would there be any reason that this function cant be found perhaps? I really have no clue!!!

On Mon, Jul 7, 2008 at 6:39 PM, Rich Schumacher <rich.schu@...> wrote:

Bonger,

Are you using Apache with the Worker MPM? If so, that could be your problem. It is fairly well documented and highly discussed that the Worker MPM on *nix is not a good combination, as explained here: http://us2.php.net/manual/en/faq.installation.php#faq.installation.apache2. The problem is not the PHP core itself, but the third-party libraries that may not be thread-safe. According to the link above, this is of much less concern to those using Windows. But perhaps it's worth a try to switch to the Prefork MPM and see if the symtpoms disappear.

Cheers,

Rich

On Sun, Jul 6, 2008 at 9:31 AM, Bradley Giesbrecht <brad@...> wrote:

With php when you include vars in double quotes don't you want to put curly braces around them like so?

$query = "SELECT * FROM Pet WHERE petType='{$pettype}'";

That's how I do it but I've been doing it so long I don't remember why.

Anyway, I would guess this is a php issue and not an apache problem.

Turn up your php error reporting. Off the top of my head something like this at the top of your script.

error_reporting(E_ALL);

php.net is your friend:

http://php.net/while

http://php.net/error_reporting

//brad

On Jul 5, 2008, at 10:55 AM, Bonger O wrote:

Hi,

I have set up an environment on my Vista laptop comprising of Apache 2.2, MySQL Server 5.1 and Php 5.2.5.

I'm using a simple php program that I found in a PHP/SQL book. The PHP program queries a MySQL table and uses a WHILE loop to traverse the results array of the query and display on screen. However, there seems to be a problem with my environment and using a WHILE loop as every time I run the program I get the error "Apache HTTP server stopped working and was closed".

I have no problems using a FOR loop but every time I use a WHILE loop Apache seems to crash. Please see below for the code I have used.

I would be extremely for any suggestions of why this is happening and any solutions offered.

Thanks.

<?php
/* Program: petDisplay.php
* Desc: Displays all pets in selected category.
*/
?>
<html>
<head><title>Pet Catalog</title></head>
<body>
<?php

$user="root";
$host="localhost";
$password="PASSWORD";
$database = "am";
$cxn = mysqli_connect($host,$user,$password,$database)
or die ("couldn't connect to server");
$pettype = "horse"; //horse was typed in a form by user
$query = "SELECT * FROM Pet WHERE petType='$pettype'";
$result = mysqli_query($cxn,$query)
or die ("Couldn't execute query.");

/*Display results in a table */
$pettype = ucfirst($pettype)."s";

echo "<h1>$pettype</h1>";
echo "<table cellspacing='15'>";
echo "<tr><td colspan='3'><hr /></td></tr>";
while($row = mysqli_fetch_assoc($result))
{
extract($row);

$f_price = number_format($price,2);
echo "<tr>\n
<td>$petName</td>\n
<td>$petDescription</td>\n
<td style='text-align: right'>\$$f_price</td>\n
</tr>\n";
echo "<tr><td colspan='3'><hr /></td></tr>\n";
}
echo "</table>\n";
?>
</body></html>

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