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hkBattousai

[PHP] Usage of $_GET(), getting a query string

10 posts in this topic

	if (!isset($_GET['storevisitor']))
		echo('No parameter.\n<br />');
	else if (is_null($_GET['storevisitor']))
		echo('storevisitor is null.');
	else if ($_GET['storevisitor']) == '1')	// GIVES ERROR HERE (LINE #6)
		echo('Storing IP.\n<br />');
	else
		echo('IP won\'t be stored.');


I try to access the PHP page with this query string:
http://localhost/?storevisitor=1
And this is the error message given:
Parse error: syntax error, unexpected T_IS_EQUAL in C:\Development\Server\DocumentRoot\index.php on line 6
What do you think the problem is? [Edited by - ApochPiQ on July 26, 2009 12:56:32 PM]
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hi,

the parenthesis is the error i think

should be


else if (($_GET['storevisitor']) == '1') // GIVES ERROR HERE (LINE #6)
echo('Storing IP.\n<br />');



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Opps, ok, I feel stupid...

I want to ask one more question which would make more sense:
Why doesn't my code ever print "storevisitor is null." message?

When I send a query string like
http://localhost/?storevisitor
it displays the message "IP won't be stored." instead of "storevisitor is null.".

How can I detect when a query string variable is sent without a value assigned to it?
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maybe your should try



if (!isset($_GET['storevisitor']))
echo('No parameter.\n<br />');
else if (empty($_GET['storevisitor']))
echo('storevisitor is null.');
else if ($_GET['storevisitor']) == '1') // GIVES ERROR HERE (LINE #6)
echo('Storing IP.\n<br />');
else
echo('IP won\'t be stored.');


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I tried empty() but this time
http://localhost/?storevisitor
and
http://localhost/?storevisitor=0
are assumed to be same by my code.

But they are different obviously.
How can I detect this difference.
I'm just curious, I won't use it in my code but I want to learn it anyway.

Thanks in advance.
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Quote:
Original post by Konfusius
Test for $_GET['storevisitor'] === ''.

I didn't work.
Your syntax looks like to be incorrect?

Thank you anyway.
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theres discussion of this problem if you look at the comments in this page

http://us3.php.net/manual/en/function.empty.php

or you could do


if (!isset($_GET['storevisitor']))
echo('No parameter.\n<br />');
else if (empty($_GET['storevisitor']) && $_GET['storevisitor']!=0)
echo('storevisitor is null.');
else if ($_GET['storevisitor']) == '1')
echo('Storing IP.\n<br />');
else
echo('IP won\'t be stored.');

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Final form of my code, and it works:
	if (!isset($_GET['storevisitor']))
echo('No parameter.\n<br />');
else if (strlen($_GET['storevisitor']) == 0)
echo('storevisitor is empty.\n<br />');
else if ($_GET['storevisitor'] == '0')
echo('IP won\'t be stored.\n<br />');
else
echo('Storing IP.\n<br />');



It works now but, I don't think that using strlen() is a professional approach to the problem.
Is there any alternative you guys can suggest?


EDIT: Thank you biggy, your last code is also a good alternative.
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Quote:
Original post by Battousai
Quote:
Original post by Konfusius
Test for $_GET['storevisitor'] === ''.

I didn't work.
Your syntax looks like to be incorrect?

Thank you anyway.
This is a bug in the GDNet forum software; two quote charactes ('') are displayed as one. His code should have read $_GET['storevisitor'] === '' (hit "Edit" on his post to see). [smile]
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