Cracking PHP Interviews : 80+ Question and Answers

How about Quickly Revising all the Important PHP Concepts in less than 3 hours before an interview?

Preparing for PHP Interview is tricky. You would need to get a good understanding of new features and revise the concepts you used in your preparation. This course helps you Prepare for PHP Interview with hands-on code examples covering 80+ PHP Interview Question and Answer on a varied range of topics listed below. 

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******* Questions Discussed in this Interview Course *******

PHP Platform

• What is PHP?

• Is PHP case sensitive?

• Is PHP weakly typed language?

• How do we install PHP?

• What is Composer?

• What is Packagist?

• How do we execute a PHP script from the command line?

• What is virtual host?

• What are XAMPP & WAMP?

• What is Apache server?

• How to check current PHP version and other information about our system?

• What is interpreter?

• Is PHP compiled or interpreted?

• What do we mean by a Framework?

• What is MVC?

Datatypes and variables

• What is a datatype?

• How many datatypes are there?

• What are rules for naming a variable?

• How will you define a constant?

• What is the purpose of constant() function?

• What are the differences between constants and variables?

• What are the different scopes of variables?

• What is string?

• What is the difference between single quoted string and double quoted string?

• How can you convert string into array elements?

• How can you convert array into strings?

• How can you concatenate two or more strings?

• Differentiate between echo and print().

• Explain static variables.

• What are PHP magic constants?

• Why do we need trim() function?

• Can you count the number of words in a string?

• How to reverse a string?

• How can you change cases in a string?

• Can you replace a substring?

• Differentiate between str_replace() and str_ireplace().

• Differentiate between printf() and print().

• Differentiate between strstr() & strchr() functions.

• Differentiate between strstr() and stristr().

• Can you encode a string in PHP?

• Differentiate between strcmp() and strncmp().

• Is it possible to remove the HTML tags from data?

• What is the use of gettype() in PHP?

• What is heredoc and nowdoc?

Flow control and Iterations

• Explain if-else statement.

• Explain switch statement with example.

• Differentiate between switch and if-else statement.

• What are the different types of operators?

• Explain arithmetic operators.

• Explain the assignment operators.

• Explain the logical operators.

• Explain the unary operators.

• Explain the comparison operators.

• Differentiate between === and == operators in PHP.

• Explain pre and post increment with example.

• What do you mean by operator overloading?

• How many loops are available in PHP?

• Explain while loop with example.

• Explain do-while loop with example.

• Explain for loop with example.

• Explain foreach loop with example.

• How can you implement an infinite loop in PHP?

• How can you implement recursion in PHP?

• Differentiate between iteration and recursion.

• Explain break statement with example.

• Explain continue statement with example.

• Give example of declaration in php?

• What is require in PHP?

Arrays

• What is an array?

• How can you print an array in PHP?

• What do we mean by the base address of an array?

• What do we mean by keys and values?

• What are the keys & values in an indexed array?

• How can we convert array into string?

• How can we convert a string into an array elements?

• How can we concatenate arrays in PHP?

• Which function counts all the values of an array?

• How can we check if an element exists in an array?

• Which function inserts an element to the end of an array?

• What is the use of array_chunk() function?

• Why do we use extract()?

Functions

• What is a function?

• What are the different types of functions?

• Explain call by value.

• Explain call by reference.

Following questions are available with the Q&A PDF provided in the course (videos on the following questions are coming soon)

• What are the function declaration rules?

• How can we declare user defined functions?

• What do we mean by actual and formal parameters?

• Maximum how many arguments are allowed in a function in PHP?

• Explain header().

• What do we mean by return type of a function?

• What is the return type of a function that doesn’t return anything?

• Do we need to mention the return type of a function explicitly in PHP?

• What is function that can be used to build a function that accepts any number of arguments?

• Explain the return statement.

• Can we use multiple return statements in a function?

• What is the use of ini_set()?

• What is the difference between unlink and unset functions?

• How ereg() function works?

• How eregi() function works?

• What is the purpose of getdate() function?

• What is the purpose of date() function?

• How will you call member functions of a class?

Requests and responses

• How can we display the correct URL of the current webpage?

• How to get the information about the uploaded file in the receiving script?

• What do we mean by server?

• What is a client?

• What do you mean by a response?

• What is HTTP?

• What are PHP superglobals?

• How will we get information sent via GET method?

• How will you get information sent via POST method?

• What is the purpse $_REQUEST variable?

• What is the purpose of $_FILES variable?

• What is the purpose of $GLOBALS variable in PHP?

• What is the purpose of $_SERVER variable in PHP?

• What is the purpose of $_COOKIE variable in PHP?

• What do you mean by environment variable in PHP?

• What is the purpose of $_ENV variable in PHP?

• What is the purpose of $_SESSION variable in PHP?

• How will you redirect a page?

• What is the purpose $_PHP_SELF variable?

• How will you get the browser’s details using PHP?

• What do you mean by HTTP status codes?

• What are the HTTP client error codes?

• What are the informational status codes?

• What are the HTTP success codes?

• How do you get the redirection related information?

• What are the HTTP client error codes?

• What are the HTTP server error codes?

• What is API?

• What is the use of an API?

• What are types of API?

• What is REST API?

• Why do we need REST API?

• Where REST API is used?

• What is JSON?

• Why do we need JSON?

• How can you exchange data using JSON?

• Differentiate between JSON & XML.

• What are the advantages of JSON?

Sessions and Cookies

• What is Session?

• What is Cookie?

• Differentiate between Session & Cookie.

• How do we start a session?

• How can we set session variable?

• How to destroy a session?

• How to remove value from session variable?

• When do we need to set session variables?

• When do we need a session and not a cookie?

• When do we need a cookie and not a session?

• How can we set a cookie?

• How to modify a cookie value?

• How will we make a check that a cookie is set or not?

• How to retrieve all cookie values?

• How to delete a cookie?

• How can we implement ‘remember me’ using PHP?

• Classify cookies.

• How will you delete a cookie?

• How to track login and logout using PHP?

Filesystem management

• How to create a file?

• What are the other way to write in a file?

• How will you check if a file exists or not using php?

• How to delete a file?

• How to copy a file?

• How to rename file?

• How to check whether a file or directory exists?

• How to check path of the file in PHP?

• How to check size of the file in PHP?

• How to write the contents inside file?

• Explain file() method.

• How To change the file permissions?

• What are different ways to get the extension of a file?

• How to create a directory using PHP?

• How to get files(contents) from directory?

• How to open a directory?

• What is include in php?

• What is require_once in php?

• What is include_once in php?

• What is require() in PHP?

• What is difference between require and include?

Regular Expressions

• What is RegEx?

• Why do we need RegEx?

• How preg_match() function works?

• Regualar Expression Notations.

• Regualar Expression Examples.

OOPs Concepts

• What is OOPs?

• What is an object?

• How can we create object of a class?

• What is a class?

• What are the basic features of OOPs?

• Is PHP purely an object oriented language?

• Differentiate between OOPs & POPs.

• What is generalization?

• What is specialization?

• What is aggregation?

• What is composition?

• What is association?

• What is abstraction?

• What is encapsulation?

• What is inheritance?

• What is super class?

• What is a sub class?

• How can you inherit a class in PHP?

• What is a constructor?

• Explain __construct().

• Classify constructor.

• What is a destructor?

• Explain $this.

• Explain multiple inheritance.

• Does PHP support multiple inheritance?

• Explain multi-level inheritance.

• What is polymorphism?

• What is method overloading?

• Does PHP support method overloading?

• What is method overriding?

• What are interfaces in PHP?

• What does the presence of operator ‘::’ represent?

• How to define a class in PHP?

• How will you add a constructor function to a PHP class?

• How will you add a destructor function to a PHP class?

• How will you access the reference to same object within the object in PHP?

• What do you mean by access modifier?

• Explain access modifiers in PHP.

• Explain final class in PHP.

• Explain abstract class.

• What is interface?

Exception Handling

• What do you mean by an exception?

• Define Exception class Hierarchy.

• How do we handle exceptions?

• Differentiate between exception and error.

• What do we mean by error log?

• How do we see PHP errors?

• What are the exception class functions?

• What does the expression Exception::__toString means?

Security and Cryptography

• Why do we need cryptography?

• What do we mean by hash functions?

• Whart is hash function in PHP?

• Example using hash().

• What is encoding and decoding?

• What is SHA1?

• Can sha1 be decrypted?

• What is sha1_file()?

• What are the disadvantages of sha1()?

• What MD5 means?

• Why can not a MD5 hash be decrypted?

• Is md5 reversible?

• Compare sha1() and md5().

• What is enctype?

• Explain each Mcrypt function supported in PHP.

• What is cryptography authentication?

PHP and HTML

• What is HTML?

• Differentiate between PHP and HTML.

• What are the different methods or HTTP verbs of sending data to the server?

• What’s the difference between GET and POST methods.

• How can we send email?

• How file upload works?

PHP and SQL

• What is SQL?

• Why do we need SQL with PHP?

• How many types of database connections possible in PHP.

• Adavantages of PDO over MySQLi approach.

• How connect to the database using PDO?

• What is SQL injection?

Miscellaneous

• How can we get the browser’s details using PHP

• What is the use of Xdebug extension?

• What is the purpose of php.ini file?

• What is curl?

• What is PDO in PHP?

• What is autoloading classes in PHP?

• Discuss die().

• What are variable variable?

New features in PHP 7

• What are return type declarations?

• Explain the Exception Hierarchy introduced in PHP 7?

• What is use of Spaceship Operator?

• What is use of Null Coalesce Operator?

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