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Why would $_FILES be empty when uploading files to PHP?

I have WampServer 2 installed on my Windows 7 computer. I'm using Apache 2.2.11 and PHP 5.2.11. When I attempt to upload any file from a form, it seems to upload, but in PHP, the $_FILES array is empty. There is no file in the c:\wamp\tmp folder. I have configured php.ini to allow file uploads...
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What does the PHP error message “Notice: Use of undefined constant” mean?

... 220 You should quote your array keys: $department = mysql_real_escape_string($_POST['department']...
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Keep-alive header clarification

...rCodeCaster 126k1818 gold badges180180 silver badges228228 bronze badges ...
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Case insensitive string as HashMap key

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Export/import jobs in Jenkins

... KhezKhez 9,35622 gold badges2626 silver badges5050 bronze badges ...
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delete a.x vs a.x = undefined

... | edited Oct 11 '17 at 1:29 answered Feb 19 '13 at 21:15 J...
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What does it mean that Javascript is a prototype based language?

.... Any thoughts? – Prisoner ZERO Jun 22 '12 at 12:54 3 ...
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How to parse JSON using Node.js? [closed]

...d answer. – Mark Kahn Nov 28 '14 at 22:25 8 ...
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What are the differences between JSON and JavaScript object? [duplicate]

...her place? – Pheap Oct 20 '10 at 19:22 1 ...
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Uncaught SyntaxError: Unexpected token :

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