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Preventing a Infinite Loop


ueon

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Hi, i'm currently having some troubles with my for loop. For some reason, it doesn't stop after it reached its conditions

 

<?php

include 'connect.php';

// Extracting Body Data
$sql = "SELECT div_file, table_file, flash_file, image_fol
	FROM stageone
	WHERE id = '1'";
$result = mysql_query ($sql) or die (mysql_error());
list ($div_num, $table_num, $flash_num, $image_fol) = mysql_fetch_row($result); 

$int_val3 = 0;
$int_val4 = 0;
$int_val5 = 0;

for ($int_val3 = 0; $int_val3 < $div_num; $int_val3++)
{
//$div_num remains '0'
$div_top = $_POST["div_top".$int_val3];
$div_left = $_POST["div_left".$int_val3];
$div_image = $_POST["div_name".$int_val3];
echo "<div style='position:absolute; left:".$div_left."px; top:".$div_top."px; overflow:auto;'>\n";
echo "<img src='".$image_fol."/".$div_image."'>\n";
echo "</div>\n";
//$div_num becomes '1'
}

//create table variables
for ($int_val4 = 0; $int_val4 < $table_num; $int_val4++)
{
$table_width.$int_val4 = $_POST["table_width".$int_val4];
$table_height.$int_val4 = $_POST["table_height".$int_val4];
$table_top.$int_val4 = $_POST["table_top".$int_val4];
$table_left.$int_val4 = $_POST["table_left".$int_val4];
$table_border.$int_val4 = $_POST["table_border".$int_val4];
$table_con.$int_val4 = $_POST["content".$int_val4];

echo "<div style='position:absolute; left:".$table_left."px; top:".$table_top."px; overflow:auto;'>\n";
}

$sql_delete = mysql_query("DELETE * FROM stageone");

if ($sql_delete)
{
echo "Delete Success";
}


?>

 

it outputs

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
dvien</title>

<link rel='stylesheet' href='' type='text/css'>
<link rel='stylesheet' href='' type='text/css'>
<script language='JavaScript' src='' type='text/javascript'></script>
<script language='JavaScript' src='' type='text/javascript'></script>
</head>

<body>
<div style='position:absolute; left:px; top:px; overflow:auto;'>

<img src='asdfasfsfsfsafasf/'>
</div>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<img src='asdfasfsfsfsafasf/'>
</div>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>

<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>
<div style='position:absolute; left:px; top:px; overflow:auto;'>

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For some reason, it doesn't stop after it reached its conditions

 

Then it isn't reaching the exit conditions. Echo $div_num before the for loop to see what it contains. I'm thinking it's either a negative number, or null, or a non-integer.

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ueon, the error I pointed out is causing the loop to run forever.  The condition for loop termination is that $int_val4 is not less than $table_num, but you are resetting $int_val4 to null every time through the loop.

 

If you fix that and you still have problems, post your code again here.

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change to

for ($int_val4 = 0; $int_val4 < $table_num; $int_val4++)
{
$table_width = $_POST["table_width".$int_val4];
$table_height = $_POST["table_height".$int_val4];
$table_top = $_POST["table_top".$int_val4];
$table_left = $_POST["table_left".$int_val4];
$table_border = $_POST["table_border".$int_val4];
$table_con = $_POST["content".$int_val4];

echo "<div style='position:absolute; left:".$table_left."px; top:".$table_top."px; overflow:auto;'>\n";
}

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