Update README.md

Author: Francis Sunday

README.md

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+# php-exam
+>A PHP exam with questions from beginner to expert level curated by [@codehakase](https://twitter.com/iamfrankcute)
+
+* What is PHP?
+* What does the initials of PHP stand for?
+* Which programming language does PHP resemble to?
+* What does PEAR stands for?
+* What is the current PHP version?
+* What is a variable?
+* How do you define a variable in PHP?
+* How do you execute a PHP script from the command line?
+* How to run the interactive PHP shell from the command line interface?
+* What are the correct and the most two common way to start and finish a PHP block of code?
+* How can i display the output directly to the browser?
+* What is the main difference between PHP 5 and PHP 7?
+* Is multiple inheritance supported in PHP?
+* What is the meaning of a final class and a final method?
+* How is comparison of objects done in PHP7?
+* How can PHP and HTML interact?
+* What type of operation is needed when passing values through a form or an URL?
+* How can PHP and Javascript interact?
+* What is needed to be able to use image function?
+* What is the use of the function ‘imagetypes()’?
+* What are the functions to be used to get the image’s properties (size, width and height)?
+* How failures in execution are handled with include() and require() functions?
+* What is the main difference between require() and require_once()?
+* How can I display text with a PHP script?
+* How can i display information of a variable and readable by human with PHP?
+* How is it possible to set an infinite execution time for PHP script?
+* What does the PHP error ‘Parse error in PHP – unexpected T_variable at line x’ means?
+* What should i do to be able to export data into an Excel file?
+* What is the function file_get_contents() usefull for?
+* How can i connect to a MySQL database from a PHP script?
+* How the result set of MySQL be handled in PHP (PDO or mysqli)?
+* How is it possible to know the number of rows returned in result set?
+* Which function gives us the number of affected entries by a query?
+* In PDO, What is the difference between $pdo->fetch(PDO::FETCH_ASSOC) and $pdo->fetchAll()?
+* How can i access the data sent through the URL with the GET method?
+* How can i access the data sent through the URL with the POST method?
+* How can i check the value of a given variable is a number?
+* How can i check the value of a given variable is alphanumeric?
+* How do I check if a given variable is empty?
+* What does the unlink() function means?
+* What does the unset() function means?
+* How do I escape data before storing it into the database?
+* How is it possible to remove escape characters from a string?
+* How can i automatically escape incoming data?
+* What does the function get_magic_quotes_gpc() means?
+* Is it possible to remove the HTML tags from data?
+* What is the static variable in function useful for?
+* How can i define a variable accessible in functions of a PHP script?
+* How is it possible to return a value from a function?
+* What is the most convenient hashing method to be used to hash passwords?
+* Which cryptographic extension provide generation and verification of digital signatures?
+* How can i define a Constant in a PHP script?
+* How can you pass a variable by reference?
+* Will a comparison of an integer 12 and a string “13” work in PHP?
+* How is it possible to cast types in PHP?
+* When is a conditional statement ended with an endif?
+* How is the ternary conditional operator used in PHP?
+* What is the function func_num_args() used for?
+* If the variable $var1 is set to 10 and the $var2 is set to the character var1, what’s the value of $$var2?
+* What does accessing a class via :: means?
+* In PHP, objects are they passed by value or by reference?
+* Are Parent constructors called implicitly inside a class constructor?
+* What’s the difference between __sleep and __wakeup?
+* What is a session?
+* How do i initiate a session in PHP?
+* How is it possible to propagate a session id?
+* What is the meaning of a Persistent Cookie?
+* What is the difference between session_unregister() and session_unset()?
+* What does $GLOBALS means?
+* What does $_SERVER means?
+* What does $_FILES means?
+* What is the difference between $_FILES[‘userfile’][‘name’] and $_FILES[‘userfile’][‘tmp_name’]?
+* How can i get the error when there is a problem to upload a file?
+* What does $_ENV means?
+* What does $_COOKIE means?
+* What does the scope of variables means?
+* What the difference between the ‘BITWISE AND’ operator and the ‘LOGICAL AND’ operator?
+* What are the two main string operators?
+* What does the array operator ‘===’ means?
+* What is the differences between $a != $b and $a !== $b?
+* How can i determine whether a PHP variable is an instantiated object of a certain class?
+* What is the goto statement useful for?
+* What is the difference between  Exception::getMessage and Exception::getLine ?
+* What does the expression Exception::__toString means?
+* How is it possible to parse a configuration file?
+* How can i determine whether a variable is set?
+* What is the difference between the functions strstr() and stristr()?
+* What is the difference between for and foreach?
+
+
+## Credits
+
+- [CareerGuru99](http://career.guru99.com/top-100-php-interview-questions-answers/)
+- [Francis Sunday](https://twitter.com/iamfrankcute)
+
+
+
+## Contributing
+Please feel free to fork this package and contribute by submitting a pull request to add to the list of questions or to make some corrections to them.
+
+
+## Feel like thanking me?
+
+Why not star the github repo? I'd love the attention! Why not share the link for this repository on Twitter or Facebook? Spread the word!
+
+and also, [follow me on twitter](https://twitter.com/iamfrankcute)!
+
+Thanks!
+Francis Sunday.
+
+
+## License
+The source code is open-sourced software licensed under the [MIT license](LICENSE.md)