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PHP : Returning a Variable Inside a $_POST variable

Posted on 2010-09-21
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Last Modified: 2012-05-10
Hi Experts:

A logical problem here - I need to place a string returned from a database in to a POST var to match up with POST variables from a form in order to access the data therein.

Can you please explain how this can be done?

Example :

      $_POST[''.$my_value["name"].'']

Will this work?
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Question by:wilson1000
8 Comments
 
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Accepted Solution

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hernst42 earned 500 total points
Comment Utility
Yes will work for the time of the execution of the php -script. It will not modify the form/HTML form where data was submitted.

$_POST is no read only superglobal. It's just like any other array.
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Expert Comment

by:Progressed
Comment Utility
why do you want to do this? post more of the script because i dont see WHY you want to use it as a POST... you already have the variable!
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Expert Comment

by:shinuq
Comment Utility
Same thing but prevents error

$var=$my_value["name"];

if(isset($_POST[$var]) && $_POST[$var]!='')
  $postedVar=$_POST[$var];


Hope this helps
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Expert Comment

by:vpx
Comment Utility
Example:
Your form:
 
<form action="valider.php" method="post">
<select name="object">
...
<input name="gender" type="text" />

The valider.php file:
<?php
$object = $_POST['object '];
$gender = $_POST['gender'];
?>

In this example, the php file is receiving two variables from a list and a text box but you can change those inputs.

Hope it helped.
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Expert Comment

by:Loganathan Natarajan
Comment Utility
Make sure you read the variable value from the form. otherwise, you cannot get the value straight from the variable. Just check the form name variable with array variable. It should work.

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Expert Comment

by:shobinsun
Comment Utility
Hi,

you need this??:

 print_r($_POST);
 echo " <br>";
 $_POST['var_name']=$my_value["name"];
 print_r($_POST);
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Expert Comment

by:Ray Paseur
Comment Utility
Install this and run it to see the moving parts.  HTH, ~Ray
<?php // RAY_post_example.php

error_reporting(E_ALL);

echo "<pre>\n"; // MAKE IT EASY TO READ







// THIS ILLUSTRATES THE RELATIONSHIP BETWEEN THE 'ACTION' AND THE 'FORM' WHEN COMBINED INTO A SINGLE PHP SCRIPT FILE







// SET A DEFAULT VALUES FOR A VARIABLE TO PREPOPULATE THE FORM - THIS COULD COME FROM A DATA BASE, OR MIGHT BE EMPTY

$my_INPUT_Field = 'ORIGINAL DATA';



// IF THE FORM WAS FILLED IN, COPY THE INPUT INTO OUR VARIABLE

if (!empty($_POST["my_INPUT_Field"]))

{

    $my_INPUT_Field = $_POST["my_INPUT_Field"];

}





// HAS ANYTHING BEEN POSTED - IF SO, $_POST IS SET AND CONTAINS THE DATA

if (!empty($_POST))

{

    // SHOW THE POST ARRAY

    var_dump($_POST);

}

// THIS IS THE END OF THE ACTION SCRIPT









// THIS IS THE FORM SCRIPT - FOR CONVENIENCE WE DROP OUT OF PHP INTO HTML

?>

<form method="post">

TYPE SOMETHING HERE:

<input type="text"   name="my_INPUT_Field"   value="<?php echo $my_INPUT_Field; ?>" />

<input type="submit" name="my_SUBMIT_Button" value="go" />

</form>

Open in new window

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Author Closing Comment

by:wilson1000
Comment Utility
Thank you! Just what I needed
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