Dynamic Variables

[TheFilmGod]

$name_ac{$i} = $_POST['name_ac{$i}'];

 

So I have $i already set = 2,

 

I want the php code to read now as: $name_ac2 = $_POST['name_ac2];

 

Will it parse correctly?

[DarkWater]

No.  Make it an array, that's the whole point of them.  It won't parse like that.  You can't dynamically assign the variable name in that manner.

[Fadion]

No.  Make it an array, that's the whole point of them.  It won't parse like that.  You can't dynamically assign the variable name in that manner.

 

Actually he is using an array and yes it will parse like that. For arrays, instead of square brackets, u can also use curly braces. Try it:

 

<?php
$arr = array('php', 'sql');
echo $arr{0}; //it will echo 'php'
echo $arr[1]; //and normally it will echo 'sql'
$id = 2;
$arr{$id} = 'html'; //add 'html' as a third value
echo $arr{$id}; //it will echo 'html'
?>

[DarkWater]

I don't think it'll work for assigning a variable.  I could be wrong though.

[Fadion]

I don't think it'll work for assigning a variable.  I could be wrong though.

 

I said it, he's using an array, not a variable.

 

This code:

$name_ac{$i} = $_POST['name_ac{$i}'];

 

is the same as:

$name_ac = array();
$name_ac[$i] = $_POST['name_ac{$i}'];

[DarkWater]

Hmm...Alright.  That's weird, I never knew you could use {} for assigning an array element, but I knew you could use it for referencing an array element.

 

P.S: Is your birthday really February 5th?

[Fadion]

P.S: Is your birthday really February 5th?

 

[OFFTOPIC] lol yep it is. Im guessing it is yours too?!

[DarkWater]

Yeah, mine is too.  What a coincidence. 

[kenrbnsn]

Getting back to the original question. What the OP wants are variable variables.

 

This works:

<?php
$i = 2;
${'name_ac'.$i} = $_POST['name_ac' . $i];
?>

 

Ken

[Riparian]

I may be completely off track here but this is code I found a number of years ago that I have found invaluable with dynamic varaibles. Everyone told me it could not be done and maybe there are better ways to do it but this is how I remember from DBase1V days.

 

Obviously you need to pull out the bits you need

 

<?php

//This loops through all the records that have been displayed on the page.

for ($index = 0; $index <= $counter; $index++) {

    
    /*
    This part sets a variable with the names we created in the first section.  
    We start with 0 and go until the number saved in the $index_count variable.
    */ 
    
    $varSubmissionID = 'SubmissionID'.$index;
    $varPostedBy = 'PostedBy'.$index;
    $varLink = 'Link'.$index;
    $varDescription = 'Description'.$index;
    $varApproved = 'Approved'.$index;

    
    /*
    This is the variable variable section.  We take the value that was assigned 
    to each name variable.  For example the first time through the loop we are 
    at the record assigned with SubmissionID0.  The value given to SubmissionID0 
    is set from the first section.  We access this value by taking the variable 
    variable of what SubmissionID0 is.
    */

    $SubmissionIDvalue = $$varSubmissionID;
    $PostedByvalue = $$varPostedBy;
    $Linkvalue = $$varLink;
    $Descriptionvalue = $$varDescription;
    $Approvedvalue = $$varApproved;


    //Update the database

    $sql = "UPDATE submissions SET PostedBy='$PostedByvalue',Link='$Linkvalue',".
        "Description='$Descriptionvalue' WHERE SubmissionID=$SubmissionIDvalue'";
//   $result = mysql_query($sql);


    //If the link was marked approved set the value of the Approved field

    if ($Approvedvalue == '-1') {
        $sql = "UPDATE submissions SET Approved='-1' WHERE SubmissionID=$SubmissionIDvalue";
//        $result = mysql_query($sql);
    }

}

?>


<?php

//Initialize counter variables

$index = 0;
$index_count = 0;
?>
<form method=post action=$PHP_SELF>\n";
<table>\n";
<tr>
<td><b>Posted By</b></td><td><b>Link</b></td>
   <td><b>Description</b></td><td><b>Approved</b>
   </td>
</tr>
<?php

/*
Assuming we already have retrieved the records from the database into an array setting 
$myrow = mysql_fetch_array().  The do...while loop assigns a value to the $xstr variable 
by taking the name and concatenating the value of $index to the end starting with 0.  So 
the first time through the loop $SubmissionIDStr would have a value of SubmissionID0 the 
next time through it would be SubmissionID1 and so forth.
*/

do {

$SubmissionIDStr = SubmissionID.$index;
$PostedByStr = PostedBy.$index;
    $LinkStr = Link.$index;
    $DescriptionStr = Description.$index;
    $ApprovedStr = Aprroved.$index;

?>
//This section would print the values onto the screen one record per row

<tr>
<td><input type=hidden name=%s value=%s>
<input type=text name=%s value=%s></td>
<td><input type=text name=%s value=%s></td>
<td><input type=text name=%s value=%s></td>
<td><input type=radio name=%s value=-1>Yes
<input type=radio name=%s value=0 checked>No</td>
</tr>
<?php
sprintf($SubmissionIDStr, 
$myrow["SubmissionID"], 
$PostedByStr, 
$myrow["PostedBy"], 
$LinkStr, 
$myrow["Link"], 
$DescriptionStr, 
$myrow["Description"], 
$ApprovedStr, 
$ApprovedStr);


//Increase counter values by 1 for each loop

$index++;
$index_count++;

} while ($myrow = mysql_fetch_array($result));

// I also had to create an index count to keep track of the total number of rows.

echo "<INPUT TYPE=hidden NAME=counter VALUE=$index_count>\n";

echo "<INPUT TYPE=submit></form>\n";

?>

 

(edited by kenrbnsn to add the

tags)