A PHP exam with questions from beginner to expert level curated by @codehakase
- 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?
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.
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The source code is open-sourced software licensed under the MIT license