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13.	Which function would you use to insert a record into a database?
	The dba_insert() function adds a record to a database.
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14.	Which function would you use to read the name of a directory item after you have opened a directory for reading?
	The readdir() function returns the name of a directory item from an opened directory.
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15.	How can you tell when you have reached the end of a file?
	The feof() function returns true when the file resource it is passed has reached the end of the file.
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16.	Which predefined variable could you use to find out about the browser that called your script?
	Browser type and version, as well as the user's operating system, are usually stored in an element called 'HTTP_USER_AGENT' in the $_SERVER array.
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