CODEWITHSUNDEEP
phphtml
android
android

Reputation: 91

The effect of additional $_POST[] variables in server performance

Please see the following simple code.

<?php
$a = $_POST['a'];
$b = $_POST['b'];
$c = $_POST['c'];
$d = $_POST['d'];
$e = $_POST['e'];
......  ?>

And in html file we have only the following fields:

<form action="file.php" method="POST">
<p>A</p> <input type="text" name="a">
<p>B</p> <input type="text" name="b">
</form>

the above html code we have only two fields but in the php file we have several $_POST[] variables and the global variables are more than the fields in html code. Now I want to know the additional $_POST[] variables values.

Is the value as the "" (empty string)? Does the web server crash? Perhaps my question is simple but it is for me ambiguous.

Upvotes: 1

Views: 94

Answers (4)

Ormoz
Ormoz

Reputation: 3013

The $_POST['c'],... are not set so you get a NOTICE. (Their value are null)

it is better to change your code to something like:

if(isset($_POST['c'])) $c=$_POST['c']; else $c='';

or

$c=isset($_POST['c'])?$_POST['c']:'';

Upvotes: 0

Bender
Bender

Reputation: 715

The first thing you need to check : var_dump($_POST)

are

    $_POST['c'];
    $_POST['d'];
    $_POST['e'];

empty? or may be c,d,e are hidden variable sent from that form.

if your form is not sending c,d,e you'll most probabely going to get Notice: Undefined index: in

if not , remove those variables

Upvotes: 1

Meenesh Jain
Meenesh Jain

Reputation: 2528

See $_POST is a global variable but its a array.

when you submit your form via POST method then you get post variable with a limited time period as the page changes all your previous post variable are gone.

If you are posting a form

see all post data using 

  print_r($_POST);

or 

 var_dump($_POST);

it gives a human readable array of post data. which will tell you what is in $_POST

Upvotes: 0

Al Amin Chayan
Al Amin Chayan

Reputation: 2500

To know any variable status try var_dump:

var_dump($_POST['d']);

will output what you need.

Upvotes: 1

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