PHP: Interview Questions PART-8
What does $_SERVER mean?
$_SERVER is an array including information created by the web server such as paths, headers, and script locations.
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What does $_FILES means?
$_FILES is an associative array composed of items sent to the current script via the HTTP POST method.
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What is the difference between $_FILES['userfile']['name'] and $_FILES['userfile']['tmp_name']?
$_FILES['userfile']['name'] represents the original name of the file on the client machine,
$_FILES['userfile']['tmp_name'] represents the temporary filename of the file stored on the server.
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How can we get the error when there is a problem to upload a file?
$_FILES['userfile']['error'] contains the error code associated with the uploaded file.
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How can we change the maximum size of the files to be uploaded?
We can change the maximum size of files to be uploaded by changing upload_max_filesize in php.ini.
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What does $_ENV mean?
$_ENV is an associative array of variables sent to the current PHP script via the environment method.
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What does $_COOKIE mean?
$_COOKIE is an associative array of variables sent to the current PHP script using the HTTP Cookies.
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What does the scope of variables mean?
The scope of a variable is the context within which it is defined. For the most part, all PHP variables only have a single scope. This single scope spans included and required files as well.
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what the difference between the 'BITWISE AND' operator and the 'LOGICAL AND' operator?
$a and $b: TRUE if both $a and $b are TRUE.
$a & $b: Bits that are set in both $a and $b are set.
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What are the two main string operators?
The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments. The second is ('.='), which appends the argument on the right to the argument on the left.
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