Why we use array_flip

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Correct Answer: htmlspecialchars only takes care of , single quote ?, double quote " and ampersand htmlentities translates all occurrences of character sequences that have different meaning in HTML

Correct Answer: - echo is the most primitive of them, and just outputs the contents following the construct to the screen print is also a construct (so parentheses are optional when calling it), but it returns TRUE on successful output and FALSE if it was unable to print out the string However, you can pass multiple parameters to echo, like: and it will output the string "Welcome to TechInterviews!" print does not take multiple parameters It is also generally argued that echo is faster, but usually the speed advantage is negligible, and might not be there for future versions of PHP printf is a function, not a construct, and allows such advantages as formatted output, but it?s the slowest way to print out data out of echo, print and printf

Correct Answer: Since the data inside the single-quoted string is not parsed for variable substitution, it?s always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution

Correct Answer: parent::constructor($value)

Correct Answer: htaccess is a configuration file running on Apache serverThese htaccess file used to change the functionality and features of apache web server eg htaccess file used for url rewrite htaccess file used to make the site password protected htaccess file can restrict some ip addresses ,so that on restricted ip adresses site will not open

Correct Answer: Yes we can use include("xyzphp") more than one time in any page but it create a prob when xyzphp file contain some funtions declaration then error will come for already declared function in this file else not a prob like if you want to show same content two time in page then must incude it two time not a prob

Correct Answer: By using $_SERVER['HTTP_USER_AGENT'] variable

Correct Answer: By default the maximum size is 2MB and we can change the following setup at phpiniupload_max_filesize = 2M

Correct Answer: $result = mysql_query($sql, $db_link); $num_rows = mysql_num_rows($result); echo "$num_rows rows found";