Introduction to PHP session processing related functions [Part 1]

PHPHandling session functions 1, session_start

Function function: Start a session or return an existing session.

Function prototype: boolean session_start(void);

Return value: Boolean value

Function description: This function has no parameters, and the return value is true. It is best to put this function first, and there cannot be any output before it, otherwise an alarm will be issued, such as: Warning: Cannot send session cache limiter – headers already sent (output started at/ usr/local/apache/htdocs/cga/member/1.php:2) in/usr/local/apache/htdocs/cga/member/1.php on line 3

PHP Processing session functions 2, session_register

Function function: Register a new variable as a session variable

Function prototype: boolean session_register( string name);

Return value: Boolean value.

Function description: This function adds a variable to the current SESSION in the global variable. The parameter name is the name of the variable you want to add, and it will be returned if successful. Logical value true. You can use the form $_SESSION[name] or $HTTP_SESSION_VARS[name] to get or assign a value.

PHPHandling session functions 3, session_is_registered

Function functions: Checks whether the variable is registered as a session variable.

Function prototype: boobean session_is_registered(string name);

Return value: Boolean value

Function description: This function can check the current session Whether the specified variable has been registered in , the parameter name is the variable name to be checked. If successful, the logical value true is returned.

PHPHandling session functions 4, session_unregister

Function function: deleted Registered variables.

Function prototype: boolean session_session_unregister(stringname);

Return value: Boolean value

Function description: This function is in the current session Delete the global Variables within variables. The parameter name is the name of the variable to be deleted. If successful, it returns true.

PHPProcessing session functions5、session_destroy

Function functions: End the current session and clear all resources in the session.

Function prototype: boolean session destroy(void);

Return value: Boolean value.

Function description: This function ends the current session. This function has no parameters, and the return value is true.

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