PHP question

[jammer1221]

Hi I have a PHP question about using a sorta if statement...i was wondering if it was possible to write soemthing were you get a varible from another page an if that varible is for example y then write You choose y or something like that....

<?PHP
choice = $_REQUEST['choice'];
if choice != y
echo(&quot;You didnt choose y&quot;);
else
echo(&quot;You choose y&quot;)
?>

I'm not sure if this will work or if theres something like this you can do in PHP well thanks in advance
Jammer1221

 

[sleipnir214]

Typically, I use either array_key_exists() or isset() to determine whether a value has been passed to a script.

Also, use $_GET or $_POST as appropriate rather than $_REQUEST. Otherwise you can fall prey to the same variable poisoning described here:

http://www.php.net/manual/en/security.registerglobals.php

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http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!

 

[jammer1221]

OK...I'm sorry I have no idea what that means or how you would use either isset() or array_key_exist()...could you please give me an example or a place to find that...that link you sent before probably had the answer but all that stuff means nothing to me as I barely get any of it thank you
Jammer1221

 

[sleipnir214]

The ultimate source of information on PHP's functions is the PHP online manual, which is available at

http://www.php.net/manual/en

and at a large number of mirrors around the world. The manual is full of example script samples. I recommend you try there.

array_key_exists() or isset() are two methods of determining whether an array, such as $_POST or $_GET contains a value. It's a good idea to test for the presence of a value before you try to use it. If $_POST['choice'] does not exist, the line "$choice = $_POST['choice'];" will generate a warning.


Here's working code, functionally equivalent to yours but with the addition of error-checking.

<?php
if (array_key_exists ('choice', $_POST) && $_POST['choice'] == 'y')
{
   print 'You chose y';
}
else
{
   print 'You didn\'t choose y';
}
?>

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!