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Display posted variables

Posted on 2004-10-17
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Last Modified: 2012-06-21
If field values are posted to another page, is there a php command to list all available variable values at the top of the page?  
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Question by:ncw
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4 Comments
 
LVL 12

Assisted Solution

by:minichicken
minichicken earned 200 total points
ID: 12331612
print_r ($_POST); //list all POST vars in an array
print_r ($_GET); //list all GET vars in an array
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Assisted Solution

by:Diablo84
Diablo84 earned 200 total points
ID: 12331692
If this is for debugging purposes then what minichicken has said will be fine, though you might want to add pre tags so it displays in a more friendly form, eg:

echo "<pre>";
print_r ($_POST);
echo "</pre>";

however if its actually as part of your system and will be displayed to users you might want to output it in a more user friendly form, for example:

$escape = array("submit","etc"); //names of fields you dont want to display such as your submit button
foreach ($_POST as $key => $var) {
 if (!in_array($key,$escape)) echo "$var<br>\n";
}

or if you want to display the input names as well, replace:

 if (!in_array($key,$escape)) echo "$var<br>\n";

with:

 if (!in_array($key,$escape)) echo "$key: $var<br>\n";
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LVL 1

Accepted Solution

by:
milkmon123 earned 200 total points
ID: 12332769
print "<table>";
while (list ($key, $val) = each ($HTTP_POST_VARS)) {
      if ($key != "Submit"){
            print "<tr><td>$key</td><td>&nbsp;=&nbsp;</td><td>$val (len = ".strlen($val).")</td></tr>";
      }
}
print "</table>";

This code displays all variables passed, plus their length (in some cases, if you are processing information for use in a third party website, you may mistakenly think a string is shorter than it really is, as html will not output the spaces visibly - so the above routine tells you the length of each posted variable aswell - so you can ensure your output is correct.

Hope this helps.

Matt
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LVL 1

Author Comment

by:ncw
ID: 12334609
Thanks everyone for commenting, I used milkmon123's example.
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