What is the difference between $argv and $argc? Give example?

Correct Answer: $_SERVER and $_ENV arrays contain different information The information depends on the server and operating system being used Most of the information can be seen of an array for a particular server and operating system The syntax is as follows: foreach($_SERVER as $key =>$value) { echo ?Key=$key, Value=$value\n?; }

Correct Answer: Super global arrays are the built in arrays that can be used anywhere They are also called as auto-global as they can be used inside a function as well The arrays with the longs names such as $HTTP_SERVER_VARS, must be made global before they can be used in an array This $HTTP_SERVER_VARS check your phpini setting for long arrays

Correct Answer: By the use of void set_time_limit(int seconds) Set the number of seconds a script is allowed to run If this is reached, the script returns a fatal error The default limit is 30 seconds or, if it exists, the max_execution_time value defined in the phpini If seconds is set to zero, no time limit is imposed When called, set_time_limit() restarts the timeout counter from zero In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out

Correct Answer: The difference lies with the execution of the languages PHP is server side scripting language, which means that it can?t interact directly with the user Whereas, JavaScript is client side scripting language, that is used to interact directly with the user

Correct Answer: PHP is rapidly gaining the popularity and many companies are switching their current language for this language PHP is a server side scripting language PHP executes the instructions on the server itself Server is a computer where the web site is located PHP is used to create dynamic pages and provides faster execution of the instructions

Correct Answer: Permissions in PHP are very similar to UNIX Each file has three types of permissions ? Read, write and execute Permissions can be changed using the change mode or CHMOD command CHMOD is followed by 3 digit number specifying the permission type CHMOD 777 is for Read, Write and execute Unnecessary permissions can be stripped off using UNMASK command Unmask (777);

Correct Answer: To access the global data which is originating externally, the super globals are used The superglobals are available as arrays These superglobals represents the data from URLs, HTML forms, cookies, sessions and also the web server For this purpose, $HTTP_GET_VARS, $HTTP_POST_VARS are used The super globals are pretty good enough to be used in functions The following are the list of super globals $_GET, $_POST, $_COOKIE;$_REQUEST, $_SERVER, $_SESSION, $_ENV, $_FILE Another PHP Superglobal, called $GLOBALS; is available for persisting every variable with global scope

Correct Answer: The mail() function of PHP is quite robust for sending bulk emails A SMTP server can also be directly used from the script PHPmailer class can be used for sending emails

Correct Answer: A HTML form should be build before uploading the file The following HTML code is used for selecting the file that is to be uploaded The type attribute of input must be ?file?

Choose a file to upload:

At the time of executing uploaderphp, the uploaded file will be stored in a temporary storage are on the webserver An associative array $_FILES['uploadedfile']['name'] is used for uploading The ?name? is the original file that is to be uploaded Another associative array $_FILES['uploadedfile']['tmp_name'] is used for placing the uploaded file in a temporary location on the server and the file should be empty and should exist with the tmp_name The following code snippet is used for uploading the file $target_path = "uploads/"; // the target location of the file $target_path = $target_path basename( $_FILES['uploadedfile']['name']); if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) { echo "The file " basename( $_FILES['uploadedfile']['name']) " has been uploaded"; } else { echo ?There was an error while uploading the file?; } The function move_uploaded_file()is used to place the source file into the destination folder, which resides on the server If the uploading is successful, the message ?The file filename has been uploaded Otherwise the error message ?There was an error while uploading the file? would be displayed

Correct Answer: Generating random passwords in PHP can be done in multiple ways depending on how much security the application demands:- Md5 function can be passed one parameter as uniqid() function which in turn generates a random number Passing the parameter as TRUE in uniqid() adds additional uniqueness