March 2009 Sina php face questions and Answers (b)

1. Please write out the PHP5 permission control modifier.

Answer: Private protected public.

2. What are the methods you use to solve traffic problems for large-volume websites?

Answer: First, verify that the server hardware is sufficient to support the current traffic.

Second, optimize database access.

Third, prohibit the external hotlinking.

Four, control the download of large files.

Five, using different host to divert the main flow of the six, the use of traffic analysis statistics software.

3. In HTTP 1.0, the meaning of status code 401 is: If you return the prompt "file not found", the header function is available, and its statement is?

Answer: 401 of the meaning is not authorized.

Header ("http/1.0 404 Not Found"); ——— File not found

Header ("http/1.1 403 Forbidden"); ——— do not allow access

4. Install PHP in the Apache module, how to load the PHP module dynamically in the file http.conf, and then use any of the statements so that Apache will all files with PHP extension as php script processing.

Answer: Dynamic loading PHP Module: LoadModule php5_module "C:/php/php5apache2.dll"

All files with PHP extension are processed as PHP scripts: AddType application/x-httpd-php-source. Phps addtype application/x-httpd-php. php. php5. PhP4 . php3. phtml

5. The properties of the class can be serialized and saved to the session so that the entire class can be restored later, which function is used?

Answer: Serialize ()/unserialize ().

6. A parameter of a function cannot be a reference to a variable, unless the module is set to ON in PHP.ini.

Answer: Allow_call_time_pass_reference.

March 2009 Sina php face questions and Answers (b)