What is the difference between using copy() and move() function in php file uploading?

Correct Answer: Opendir():- It opens the directory This function returns a directory stream on success and FALSE and an error on failure Syntax: Opendir(directory, context) Context is a set of options that can modify the behavior of a stream Example: opens sample directory $dir = opendir("directory"); Readdir(): It returns an entry from a directory handle opened by opendir() Syntax: Readdir(dir_stream) Example: $file = readdir($dir); closedir(): It closes a directory handle opened by opendir() Syntax: closedir(dir_stream) Example: $file = close($dir);

Correct Answer: Chmod() is used for changing permissions on a file Syntax: Chmod(file, mode) Mode here specifies the permissions as follows: The first number is always zero The second number specifies permissions for the owner The third number specifies permissions for the owner's user group The fourth number specifies permissions for everybody else Possible values (to set multiple permissions, add up the following numbers) 1 = execute permissions 2 = write permissions 4 = read permissions Example: // everything for owner, read for owner's group chmod("testtxt",0740);

Correct Answer: User names and passwords in PHP can be encrypted using md5 function MD5 function calculates the md5 hash of a string It is basically used for encryption It is also used for digital signature applications, where a large file must be "compressed" in a secure manner Example: Md5($str); Crypt() function can also be used to encrypt a string, It used MD5, DES or blow fish algorithms for encryption Syntax: Crypt(str, salt) Salt is an optional parameter used to increase the number of characters encoded, to make the encoding more secure

Correct Answer: A PHP Session persist the user information to be used later For example, user name, password, shopping item details The session is temporary and will be removed soon after the user has left the web site The session can be persisted for long term usage on databases like MySQL Each session is identified by a unique Id number for every visitor The first step to use PHP session is to start the session The starting session must precede the operations like HTML or the other The statement session_start() starts the PHP session and registers the user?s information on the server

Correct Answer: The function setcookie() is used to define a cookie that is to be sent along with HTTP headers The cookie must be sent prior to any output from the script as is the protocol restriction After setting the cookies, they can be used when the next page is loaded by using $_COOKIE or $HTTP_COOKIE_VARS arrays

Correct Answer: There is a decent page in the php manual on the subject, in short mysql_pconnect() makes a persevering association with the database which implies a SQL join that don't close when the execution of your script closes mysql_connect()provides just for the database new association while utilizing mysql_pconnect , the capacity would first attempt to locate a (relentless) connection that is as of now open with the same host, username and password On the off chance that one is found, an identifier for it will be returned as opposed to opening another connection the connection with the SQL server won't be terminated when the execution of the script ends Rather, the link will stay open for future use

Correct Answer: - When two processes are waiting to update the rows of a table which are locked by another process, the situation is called a deadlock - The reasons for it to happen are: * lack of proper row lock commands * Poor design of front-end application - It reduces the performance of the server severely - These locks get automatically released automatically when a commit/rollback operation is performed or any process is killed externally

Correct Answer: Control File is used for: - Database recovery - Whenever an instance of an ORACLE database begins, its control file is used to identify the database and redo log files that must be opened for database operation to go ahead

Correct Answer: - TABLES - VIEWS - INDEXES - SYNONYMS - SEQUENCES - TABLESPACES

Correct Answer: - Rename : It is a permanent name provided to a table or column - Alias : It is a temporary name provided to a table or column which gets over after the execution of SQL statement