How does the $myvalue get populated???

tlavelle · August 17, 2007

Another noobie question. So I have this form

if(!isset($_POST['wercbench2']) and (mysql_num_rows($metric_result)) > 0){

    // yes
    // print them one after another
//echo "<form action=\"results.php\" method=\"post\" name\"wercbench2\">";
echo "<form action=\"results.php\" method=\"post\" name\"wercbench2\">";
    echo "<table cellpadding=10 border=1>";
    echo "<tr>";
        echo "<td>Metric Description</td>";
        echo "<td>Average</td>";
        echo "<td>Best Practice</td>";
	echo "<td>Enter your value here</td>";
        echo "</tr>";
    while($row = mysql_fetch_row($metric_result)) {
        echo "<tr>";
        echo "<td>".$row[0]."</td>";
        echo "<td>" . $row[1]."</td>";
        echo "<td>".$row[2]."</td>";
	echo "<td><input type=\"text\" name=\"myvalue[]\" value=\"\" /></td>";
        echo "</tr>";
    }
    echo "<tr><td colspan=\"3\"> </td><td align=\"center\"><input type=\"submit\" name=\"wercbench_next2\" value=\"Compare\"></td></tr></table>";
}

And this code that processes the form

$len = mysql_num_rows($metric_result);

for( $i = 0; $i < $len; ++$i )
{
    $row = mysql_fetch_row($metric_result);

    echo "<tr>";
      echo "<td>" . $row[0]. "</td>";
      echo "<td>" . $row[1]. "</td>";
      echo "<td>" . $row[2]. "</td>";
      echo "<td>" . $myvalue[$i] . "</td>";
    echo "</tr>";
}


}

$_SESSION['Posted_values'] = array();
foreach($_POST as $fld => $val)
   $_SESSION['Posted_values'][$fld] = $val;
   
   echo '<pre>' . print_r($_SESSION,true) . '</pre>';

My questions are:

How does the $myvalue array get populated? Where do the indexes come from? This code snippet seems to understand the $myvalue array

$_SESSION['Posted_values'] = array();
foreach($_POST as $fld => $val)
   $_SESSION['Posted_values'][$fld] = $val;
   
   echo '<pre>' . print_r($_SESSION,true) . '</pre>';

while this snippet does not

$len = mysql_num_rows($metric_result);

for( $i = 0; $i < $len; ++$i )
{
    $row = mysql_fetch_row($metric_result);

    echo "<tr>";
      echo "<td>" . $row[0]. "</td>";
      echo "<td>" . $row[1]. "</td>";
      echo "<td>" . $row[2]. "</td>";
      echo "<td>" . $myvalue[$i] . "</td>";
    echo "</tr>";
}


}

MadTechie · August 17, 2007

probably from an included file.. not in that code supplied

unless global register is on

wildteen88 · August 17, 2007

In the following code:

 <?php
$_SESSION['Posted_values'] = array();
foreach($_POST as $fld => $val)
   $_SESSION['Posted_values'][$fld] = $val;
   
   echo '<pre>' . print_r($_SESSION,true) . '</pre>';
?>

PHP is looping through the $_POST array variable which it then stores all _POST data into the Posted_values session variable.

In your second block of code where does $myvalue come from? Looks like you are pulling data out of the database then you seem to pop $myvalue into that block of code from no where.

If you want to use the myvalue from the Posted_values session you should use $_SESSION['Posted_values']['myvalue'] instead.

tlavelle · August 17, 2007

$myvalue comes from user entered data from the first form in the first file.

dbo · August 17, 2007

Can you paste the output for print_r($_SESSION, true)?

tlavelle · August 17, 2007

I'm sorry. I am just not wrapping my head around this.

This code

<?php
session_start();
?>

<html>
<head>
<basefont face="Arial">
</head>
<body>

<?php


// set server access variables
$host = "localhost";
$user = "root";
$pass = "";
$db = "wercbench";
$useryear=$_SESSION['sess_year'];



// open connection
$connection = mysql_connect($host, $user, $pass) or die ("Unable to connect!");

// select database
mysql_select_db($db) or die ("Unable to select database!");

//define Query
$metric_query = "SELECT metric_desc.met_desc, userdata.median, userdata.best_pract FROM metric_desc, userdata where metric_desc.met_key=userdata.met_key and $useryear=userdata.year";

//execute query
$metric_result = mysql_query($metric_query) or die ("Error in query: $query. ".mysql_error());




if(!isset($_POST['wercbench2']) and (mysql_num_rows($metric_result)) > 0){


echo "<form action=\"results.php\" method=\"post\" name\"wercbench2\">";
    echo "<table cellpadding=10 border=1>";
    echo "<tr>";
        echo "<td>Metric Description</td>";
        echo "<td>Average</td>";
        echo "<td>Best Practice</td>";
	echo "<td>Your Data</td>";
	echo "<td>Your Data compared to Best Practice</td>";
        echo "</tr>";


//create index for $myvalue array based on number of results returned from $metric_result query
$len = mysql_num_rows($metric_result);

for( $i = 0; $i < $len; ++$i )
{
    $row = mysql_fetch_row($metric_result);

    echo "<tr>";
      echo "<td>" . $row[0]. "</td>";
      echo "<td>" . $row[1]. "</td>";
      echo "<td>" . $row[2]. "</td>";
      echo "<td>" . $_SESSION['Posted_values']['myvalue']. "</td>";
    echo "</tr>";
}


}

$_SESSION['Posted_values'] = array();
foreach($_POST as $fld => $val)
   $_SESSION['Posted_values'][$fld] = $val;
   
   echo '<pre>' . print_r($_SESSION,true) . '</pre>';


?>


</body>
</html>

is now yielding these results

Array

(

[Posted_values] => Array

(

[myvalue] => Array

(

[0] => 6

[1] => 6

[2] => 6

[3] => 6

[4] => 6

[5] => 6

[6] =>

[7] =>

[8] =>

[9] =>

[10] =>

[11] =>

[12] =>

[13] =>

[14] =>

[15] =>

[16] =>

[17] =>

[18] =>

[19] =>

[20] =>

[21] =>

[22] =>

[23] =>

[24] =>

[25] =>

[26] =>

[27] =>

[28] =>

[29] =>

[30] =>

[31] =>

[32] =>

[33] =>

[34] =>

[35] =>

[36] =>

[37] =>

[38] =>

[39] =>

[40] =>

[41] =>

[42] =>

[43] =>

[44] =>

[45] =>

[46] =>

[47] =>

[48] =>

[49] =>

[50] =>

[51] =>

[52] =>

[53] =>

[54] =>

)

[wercbench_next2] => Compare

)

[sess_year] => 2005

[sess_ind] => All

)

Metric Description Average Best Practice Your Data Your Data compared to Best Practice

On time receipts 0.92 0.98 Array

On time shipments 0.98 0.99 Array

Fill rate-line 0.96 0.99 Array

Fill rate-order 0.96 0.99 Array

% of orders shipped complete 0.96 0.99 Array

% of overtime hours 0.1 0.04 Array

Days of raw materials on hand 20 10 Array

.

wildteen88 · August 17, 2007

Try using:

echo "<td>" . $_SESSION['Posted_values']['myvalue'][$i] . "</td>";

instead of

echo "<td>" . $_SESSION['Posted_values']['myvalue'] . "</td>";

$_SESSION['Posted_values']['myvalue'] contains an array.

dbo · August 17, 2007

Hell I've learned something. I didn't realize you could name your fields (in HTML) as myvalue[] for example and it will force the value into an array. I guess I've never really had a need to but it could be useful.

MadTechie · August 17, 2007

works a treat on forms

tlavelle · August 17, 2007

Thanks...A few questions. I just cannot wrap my mind around this

Each textbox in the form has a name of $myvalue[]

so the name of each textbox is an array variable?

Does the posting of that form create the index values for each array element? How do the name value pairs get generated?

also, what is this?

. $_SESSION['Posted_values']['myvalue'][$i] .

I understand $_SESSION['Posted_values'] is one array

I am not really sure what ['myvalue'] is. IS this an additional index for a 2 dimensional array?

And I get what $i is

What statement assigns the values of the textboxes to the $myvalue array?

tlavelle · August 17, 2007

Hell I've learned something. I didn't realize you could name your fields (in HTML) as myvalue[] for example and it will force the value into an array. I guess I've never really had a need to but it could be useful.

Yes...please expalin this moire. I don't understand hwo this works

dbo · August 17, 2007

Hrmmm. Can you do it as an associative array of sorts? I'm not sure how a list of unamed variables buys me much if I have no way to identify them.

dbo · August 17, 2007

Which I think is why tlavelle is having a problem...

tlavelle · August 17, 2007

I am sorry. I am not following those last 2 comments. What do you want as an associative array? and what list of unamed variables are you referring to?

dbo · August 17, 2007

They were directed at madtechie.

But the "unnamed" array indexes I was talking about are in your myvalue[] array. It's just a normal array indexed with numbers. If you could have myvalue['textbox1'] = "Jim"; etc it might be more useful.... this is the associative array I was talking about... or lack there of.

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How does the $myvalue get populated???

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