Array passing in $Post method . Error

[bobbychla]

i created an array like this

 

while{

$ir = 0;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['id_sub']; $ir++;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['seminar_topic']; $ir++;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['seminar_mark']; $ir++;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['attendance']; $ir++;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['internal_mark']; $ir++;

$stud[$row_mrk['id_sub']][$ir]=$row_mrk['external_mark']; $ir++;

}

 

echo "<input type='hidden' name='ar_std' id='ar_std' value='$stud' /> </table>" ;

 

and it is able to print in the same page using

 

foreach ($stud as $v1) {

echo "$v1\n<br>";

foreach ($v1 as $v2) {

echo "$v2\n<br>";

}

}

 

and in the next page

 

$ar_stud[]=$_POST["ar_std"];

 

I'm getting an error

PHP Warning:  Invalid argument supplied for foreach() in save.php on line 25

PHP Stack trace:

[bobbychla]

Can we pass array in $_POST method ?

 

if yes plz give me the tips.

[voip03]

http://www.tanzilo.com/2008/11/09/php-pass-all-post-and-get-variables-in-array-in-function-parameter/

[btherl]

An array can't be passed directly like that, but you can serialize it:

 

<?php
$stud_serialized = serialize($stud);

echo "<input type='hidden' name='ar_std' id='ar_std' value='$stud_serialized' /> </table>" ; 

// And in your receiving script

$ar_stud = unserialize($_POST["ar_std"]);
?>

 

But you are probably better off storing it in $_SESSION

[xyph]

If you pass it using a session, be sure to have a unique token attached to that request, and pass it in a hidden field.

 

$_SESSION['formData'][$token] = whatever array of data you want

 

That way, someone submitting another form in a different tab that uses sessions to hold the information won't corrupt values in the original tab. This behavior will annoy a multitasking user and be very hard to debug.

 

This is a BAD use of session though, IMO. A better way to do this would be to pass the parameters you used in your query over to the next page, and retrieve the data again. Most engines will still have the results in memory and it will be lightning fast - at LEAST as fast as retrieving the values from a flat file using sessions.

 

This is all speculative though, as I don't know how your script works in it's entirety.

[pein87]

You can if your trying to do multi deletes using html. Set you checkbox input tag's name attribute to myName[] or as an example

 

<form action="del.php" method="post">
<input type="checkbox" name="ids[]" value="1" />
<input type="checkbox" name="ids[]" value="2" />
</form>

$ids = $_POST['ids'];

foreach($ids as  $id)
{

echo $id . "<br />";

}

 

There are other methods though and you may google for a function that allows you to do that or write your own.

[KevinM1]

ANY group of form fields whose name is written in array notation (e.g., "textbox[]") will be handled as an array, not just checkboxes.