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kev1952
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Joined: 08 Sep 2005
Posts: 105
Location: Townsville Australia
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 Posted: Wed Feb 08, 2006 11:30 am Post subject: Functions |
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I am having a great deal of trouble getting my head around "functions" in PHP. It's not that I don't understand the use of a function but the logic is puzzling me. I found a simple function (for test purposes) on the net and when I try it I get this error:
Fatal error: Cannot re-assign $this in E:\Website\htdocs\func.php on line 4
The code is:
| Code: | <?php
function test_scope()
{
$this = 'that';
return $this;
}
// Call the function
$this = test_scope();
// Echo $this
echo $this;
?> |
To me it looks okay but when I try it it returns the above error. I feel like I'm falling down a very big hole with functions and have yet to see the way out. I'm sure it's very simple once you know how to do it but I just can't seem to find the correct way.
Perhaps someone here can either explain it to me or point me to a resource that will explain it. I'm tearing my hair out with it! :(
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Cheers.... Kev
Kev's Place - http://www.kevsplace.com
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MonkeyNation
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Joined: 05 Feb 2005
Posts: 921
Location: Cardiff
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| Posted: Wed Feb 08, 2006 11:34 am Post subject: |
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Well, without using global, when you make a function, all variables from outside it (With the exception of superglobals($_GET, etc)) are erased. However, when a function is executed, the variabled created inside it are kept. (Might be a way around it, never had to find out.)
If you do:
| Code: | | $that = test_scope(); |
- I believe it will work. (Or just echo test_scope();)
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kev1952
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Joined: 08 Sep 2005
Posts: 105
Location: Townsville Australia
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| Posted: Wed Feb 08, 2006 11:45 am Post subject: |
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Thanks, MN, but neither way worked. Still go the same error. I actually had tried that before but re-ran it only to get the same result.
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Cheers.... Kev
Kev's Place - http://www.kevsplace.com
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MonkeyNation
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Joined: 05 Feb 2005
Posts: 921
Location: Cardiff
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| Posted: Wed Feb 08, 2006 11:58 am Post subject: |
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Don't use $this in that manner, basically; it's a documented bug in PHP.
| Code: | function is_even_number($number) {
if ($number < 2)
return false;
if (strstr((string)($number/2), ".")) //The (string) just makes it a string, so we can check for a decimal point.
return false;
return true;
}
//Usage:
if (is_even_number(7))
echo "Nice going!";
else
echo "Unlucky."; |
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kev1952
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Joined: 08 Sep 2005
Posts: 105
Location: Townsville Australia
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| Posted: Wed Feb 08, 2006 12:43 pm Post subject: |
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Now it's starting to make some sense. I see how you passed the variables between the usage and the function - and the original code worked when I changed the name of the variable.
I can expand on that now. Thanks!
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Cheers.... Kev
Kev's Place - http://www.kevsplace.com
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