General Knowledge Quiz - Question & Answers Set - 16

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Home Practice Tests General Knowledge Practice Tests General Knowledge Quiz - Question & Answers Set - 16

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General Knowledge Quiz - Question & Answers Set - 16

Question 1 :
What is the special meaning of __sleep and __wakeup
A__sleep returns the array of all the variables than need to be saved, while __wakeup retrieves them.

Question 2 :
How can we extract string 'abc.com ' from a string http://info@abc.com using regular expression of php
AWe can use the preg_match() function with "/.*@(.*)$/" as the regular expression pattern. For example: preg_match("/.*@(.*)$/","http://info@abc.com",$data); echo $data[1];

Question 3 :
What is the difference between the functions unlink and unset
Aunlink() is a function for file system handling. It will simply delete the file in context. unset() is a function for variable management. It will make a variable undefined.

Question 4 :
How can we create a database using PHP and mysql
AWe can create MySQL database with the use of mysql_create_db($databaseName) to create a database.

Question 6 :
What is the use of function ucwords
Aucwords() makes every first letter of every word capital, but it does not lower-case anything else. To avoid this, and get a properly formatted string, itÔÇÖs worth using strtolower() first.

Question 7 :
What is the difference between htmlentities() and htmlspecialchars()
Ahtmlspecialchars only takes care of <, >, single quote ÔÇÿ, double quote " and ampersand. htmlentities translates all occurrences of character sequences that have different meaning in HTML.

Question 8 :
Which are the hashing functions in PHP
Amd5() crc32() sha1()

Question 9 :
How can we destroy the session, how can we unset the variable of a session
Asession_unregister() - Unregister a global variable from the current session session_unset() - Free all session variables

Question 10 :
What are the different functions in sorting an array
AArray sorting functions in PHP: asort() arsort() ksort() krsort() uksort() sort() natsort() rsort()

Question 11 :
How can we know the count/number of elements of an array
A There are two ways a) sizeof($array) - This function is an alias of count() b) count($array) - This function returns the number of elements in an array.

Question 12 :
What is the difference between md5(), crc32() and sha1() crypto on PHP
AThe major difference is the length of the hash generated. CRC32 is, evidently, 32 bits, while sha1() returns a 128 bit value, and md5() returns a 160 bit value. This is important when avoiding collisions.

Question 13 :
Will comparison of string "10" and integer 11 work in PHP
AYes, internally PHP will cast everything to the integer type, so numbers 10 and 11 will be compared.

Question 14 :
What is meant by MIME
AMIME is Multipurpose Internet Mail Extensions is an Internet standard for the format of e-mail. However browsers also uses MIME standard to transmit files. MIME has a header which is added to a beginning of the data. When browser sees such header it shows

Question 15 :
What is meant by nl2br()?
Anl2br() converts all new line characters to HTML tag

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