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[SOLVED] Arrays in for form checkbox fields - not getting information

Beauford

By Beauford
in PHP Coding Help

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Beauford Member

Beauford

Posted
Posted

I have the following line:

 

<input type='checkbox' name='d[]' value='{$r['evID']}' id='checkbox'>

 

I have checked and the values for $r['evID'] are there.

 

The problem is when I click submit and it gets to the following function, there is no data.

 

for($i = 0; $i < count($_POST['d']); $i++) {

    $db->query("DELETE FROM events WHERE evID='{$_POST['d'][$i]}'");

}

 

if I do a print_r($_POST) I get:

 

Array ( [d] => Array [read] => Array [submit] => submit [x] => 50 [y] => 14 )

 

If I do a echo $_POST['d'][$i]; within the loop I get the letter 'A' and nothing else.

 

This did work at one time, so I don't know what I did to screw it up. Any help is appreciated. I also tried a foreach and get the same thing.

 

B

xtopolis Member

xtopolis

Posted
Posted

Take a look at this simple example, it may help you understand PHP and checkboxes more easily.

(Copy / paste and run / test it!)

 

<html>
<head>
</head>
<?php
$evID = array(5,2,31,6,87);
//-------

if(isset($_POST['submit'])){
  foreach($_POST['d'] as $d){
    if(in_array($d,$evID)){
      echo '$db->query("DELETE FROM events WHERE evID=\''.$d.'\'")';
      echo '<br />';
    }else{
      echo 'Unexpected $_POST value.<br />';
    }
  }
}
?>
<hr />
<form method="post">
  <?php
    foreach($evID as $e){
      echo '<input type="checkbox" name="d[]" value="'.$e.'" id="checkbox"> evID: '.$e.' <br />';
    }
  ?>
  <input type="submit" name="submit" />
</form>
</body>
</html>

Beauford Member

Beauford

Posted
  • Author
Posted

Take a look at this simple example, it may help you understand PHP and checkboxes more easily.

(Copy / paste and run / test it!)

 

<html>
<head>
</head>
<?php
$evID = array(5,2,31,6,87);
//-------

if(isset($_POST['submit'])){
  foreach($_POST['d'] as $d){
    if(in_array($d,$evID)){
      echo '$db->query("DELETE FROM events WHERE evID=\''.$d.'\'")';
      echo '<br />';
    }else{
      echo 'Unexpected $_POST value.<br />';
    }
  }
}
?>
<hr />
<form method="post">
  <?php
    foreach($evID as $e){
      echo '<input type="checkbox" name="d[]" value="'.$e.'" id="checkbox"> evID: '.$e.' <br />';
    }
  ?>
  <input type="submit" name="submit" />
</form>
</body>
</html>

 

Warning: Invalid argument supplied for foreach() in D:\Websites\events.php on line 363

 

Which is this line. foreach($_POST['d'] as $d){

 

My question is this though, why is $_POST['d'] only getting the single letter A. I have searched this up and down and my syntax appears to be correct.

 

Thx

Beauford Member

Beauford

Posted
  • Author
Posted

 

This is from viewing the source, in which you can see the numbers are in the value fields where they should be. I also tried putting quotes around the d[] like 'd[]' which made no difference, but I'm grasping.....

 

The php code looks exactly the same as below, just change the value number to the actual variable, in this case $r['evID']. There is also a while loop for the

the two inputs to get the info from the DB:

 

while($r=$db->fetch_row($q)) {

 

 

<form action='events.php?events=delsel' method='post'>
<table width='100%' cellspacing='1' style='text-align: left'>
<tr>
<td width='4%' align='right'> 
<input type='checkbox' name=d[] value='475'> 
<input type='hidden' name=read[] value='1'>	
</td>
</tr><tr>
<td width='4%' align='right'> 
<input type='checkbox' name=d[] value='476'> 
<input type='hidden' name=read[] value='1'>	
</td>
</tr><tr>
<td width='4%' align='right'> 
<input type='checkbox' name=d[] value='477'> 
<input type='hidden' name=read[] value='1'>	
</td>
</tr><tr>
<td width='4%' align='right'> 
<input type='checkbox' name=d[] value='478'> 
<input type='hidden' name=read[] value='1'>	
</td>
</tr><tr>
<td width='4%' align='right'> 
<input type='checkbox' name=d[] value='479'> 
<input type='hidden' name=read[] value='1'>	
</td>
</tr><tr>
<td>
<input type='hidden' name='submit' value='submit'>
<INPUT TYPE='image' src='images/e-deletesel.gif' width='95' height='25' ALT='Delete'>
</td>
</tr>
</table>
</form>

 

 

This is the function for the php where the above goes when submit is clicked.

 


function delete_selected() {

global $db, $userid;

for($i = 0; $i < count($_POST['d']); $i++) { 
$db->query("DELETE FROM events WHERE evID='{$_POST['d'][$i]}'");
}
header("Location: events.php");
exit();
}

 

Thanks

Beauford Member

Beauford

Posted
  • Author
Posted

How stupid of me, I found the following in one of my global include files that was causing the problem.

 

if(get_magic_quotes_gpc() == 0) {

foreach($_POST as $k => $v) {

    $_POST[$k]=addslashes($v);

  }

  foreach($_GET as $k => $v) {

    $_GET[$k]=addslashes($v);

  }

}

 

Thanks

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