What is the difference between _construct() and _destruct() methods in php?

Correct Answer: The function unlink() is to remove a file, where as unset() is used for destroying a variable that was declared earlier

Correct Answer: Following are the steps to create a simple AD rotator script without using database in PHP: - All the ad?s can be collected in one place and be displayed randomlyrand() function can be used for this purpose - In order to NOT use any database, a flat file can be used to store the ad?s - In order to store the Ad?s information (HTML code), a flat file say ?adtxt? can be created - The random number can be stored in a variable $result_random=rand(1, 100); - Conditions can be checked to display the ad?s if($result_random<=70) { echo "Display ad1"; }

Correct Answer: HTTP headers can be used in PHP by redirection which is written as: The headers can be added to HTTP response in PHP using the header() The response headers are sent before any actual response being sent The HTTP headers have to be sent before taking the output of any data The statement above gets included at the top of the script

Correct Answer: we can always fetch from one database and rewrite to another Here is a nice solution of it$db1 = mysql_connect("host","user","pwd") mysql_select_db("db1", $db1); $res1 = mysql_query("query",$db1);$db2 = mysql_connect("host","user","pwd") mysql_select_db("db2", $db2); $res2 = mysql_query("query",$db2);At this point you can only fetch records from you previous ResultSet, ie $res1 â?? But you cannot execute new query in $db1, even if you supply the link as because the link was overwritten by the new dbso at this point the following script will fail $res3 = mysql_query("query",$db1); //this will failSo how to solve that? take a look below $db1 = mysql_connect("host","user","pwd") mysql_select_db("db1", $db1); $res1 = mysql_query("query",$db1); $db2 = mysql_connect("host","user","pwd", true) mysql_select_db("db2", $db2); $res2 = mysql_query("query",$db2); So mysql_connect has another optional boolean parameter which indicates whether a link will be created or not, as we connect to the $db2 with this optional parameter set to 'true', so both link will remain live Now the following query will execute successfully $res3 = mysql_query("query",$db1);

Correct Answer: Yes, internally PHP will cast everything to the integer type, so numbers 10 and 11 will be compared

Correct Answer: We can send 1024 bytes utilizing GET() yet POST() can exchange extensive measure of information and POST is the protected strategy than GET technique

Correct Answer: The PHP default variable $_PHP_SELF is utilized for the PHP script name and when you click "submit" catch then same PHP script will be called

Correct Answer: The principle distinction amongst sessions and cookies is that sessions are put away on the server, and cookies are put away on the client's PCs in the content record position Cookies can not hold various variables,But Session can hold numerous variablesWe can set expiry for a cookie,The session just stays dynamic the length of the program is openUsers don't have admittance to the information you put away in Session,Since it is put away in the server Session is mostly utilized for login/logout reason while cookies utilizing for client movement following

Correct Answer: $filename = "/home/user/guest/newfiletxt"; $file = fopen( $filename, "w" ); if( $file == false ) { echo ( "Error in opening new file" ); exit(); } fwrite( $file, "This is a simple test\n" ); fclose( $file );

Correct Answer: ANALYZE command is used to perform various functions on index, table, or cluster, as listed below: - It helps in dentifying migrated and chained rows of the table or cluster - It helps in validating the structure of the object - It helps in collecting the statistics about object used by the optimizer They are then stored in the data dictionary - It helps in deleting statistics used by object from the data dictionary