| 1: |
Which server variable might give you the URL of the referring page?
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| 2: |
Why can you not rely on the $_SERVER['REMOTE_ADDR'] variable to track an individual user across multiple visits to your script?
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| 3: |
What does HTTP stand for?
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| 4: |
Which client header line tells the server about the browser that is making the request?
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| 5: |
What does the server response code 404 mean?
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| 6: |
Without making your own network connection, which function might you use to access a Web page on a remote server?
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| 7: |
Given an IP address, which function could you use to get a hostname?
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| 8: |
Which function would you use to make a network connection?
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| 9: |
Which PHP function would you use to send an email?
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| |
| A1:
| You can often find the URL of the referring page in the $_SERVER['HTTP_REFERER'] variable. |
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| A2:
| Many service providers allocate a different IP address to their users every time they log on, so you cannot assume a user will return with the same address. |
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| A3:
| HTTP stands for Hypertext Transfer Protocol. |
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| A4:
| A client might send a User-Agent header, which tells the server about the client version and operating system that are running. |
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| A5:
| The server response 404 means that the requested page or resource cannot be found on the server. |
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| A6:
| The fopen() function can be used for Web pages on remote machines as well as files on your file system. |
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| A7:
| The gethostbyaddr() function accepts an IP address and returns a resolved hostname. |
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| A8:
| The fsockopen() function establishes a connection with a remote server. |
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| A9:
| You can send email with the mail() function. |
