How about Quickly Revising all the Important PHP Concepts in less than 2 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 50 PHP Interview Questions and Answers 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?
- Has 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 a virtual host?
- What are XAMPP & WAMP?
- What is the Apache server?
- How to check the current PHP version and other information about our system?
- What is an 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 data types are there?
- What are the rules for naming a variable?
- How will you define a constant?
- What is the purpose of the constant() function?
- What are the differences between constants and variables?
- What are the different scopes of variables?
- What is the string?
- What is the difference between the single-quoted string and double-quoted string?
- How can you convert a string into array elements?
- How can you convert the 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 the 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 the data?
- What is the use of gettype() in PHP?
- What are heredoc and now doc?
Flow control and Iterations
- Explain the if-else statement.
- Explain switch statements with examples.
- Differentiate between a switch and an 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 the do-while loop with example.
- Explain for loop with example.
- Explain for each 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 the brake statements with examples.
- Explain continue statements with examples.
- Give an example of a declaration in PHP?
- What is required in PHP?
Following questions are available with the Q&A PDF provided in the course (videos on the following questions are coming soon)
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 an array into a string?
- How can we convert a string into 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 the array_chunk() function?
- Why do we use extract()?
Functions
- What is a function?
- What are the different types of functions?
- Classify function based on parameters.
- Differentiate between parameterized and not parameterized functions.
- Does PHP support both calls by value and call by reference?
- Explain call by value.
- Explain the call by reference.
- 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 the header().
- What do we mean by the 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 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 the date() function?
- How will you call the 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 the 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 the GET method?
- How will you get information sent via the POST method?
- What is the purpose $_REQUEST variable?
- What is the purpose of the $_FILES variable?
- What is the purpose of the $GLOBALS variable in PHP?
- What is the purpose of the $_SERVER variable in PHP?
- What is the purpose of the $_COOKIE variable in PHP?
- What do you mean by the environment variable in PHP?
- What is the purpose of the $_ENV variable in PHP?
- What is the purpose of a $_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 the types of API?
- What is the 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 the session variable?
- How to destroy a session?
- How to remove value from the 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 is 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 the file?
- How to check whether a file or directory exists?
- How to check the path of the file in PHP?
- How to check the size of the file in PHP?
- How to write the contents inside the file?
- Explain file() method.
- How To change the file permissions?
- What are the different ways to get the extension of a file?
- How to create a directory using PHP?
- How to get files(contents) from the directory?
- How to open a directory?
- What is included in PHP?
- What is require_once in PHP?
- What is include_once in PHP?
- What is require() in PHP?
- What is the difference between require and include?
Regular Expressions
- What is RegEx?
- Why do we need RegEx?
- How preg_match() function works?
- Regular Expression Notations.
- Regular Expression Examples.
OOPs Concepts
- What is OOPs?
- What is an object?
- How can we create an 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 an association?
- What is abstraction?
- What is encapsulation?
- What is inheritance?
- What is the superclass?
- What is a subclass?
- How can you inherit a class in PHP?
- What is a constructor?
- Explain __construct().
- Classify constructor.
- What is a destructor?
- Explain $this.
- Explain multiple inheritances.
- Does PHP support multiple inheritances?
- Explain multi-level inheritance.
- What is polymorphism?
- What is method overloading?
- Does PHP support method overload?
- What is method overriding?
- What are the interfaces in PHP?
- What does the presence of the 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 the same object within the object in PHP?
- What do you mean by access modifier?
- Explain access modifiers in PHP.
- Explain the final class in PHP.
- Explain the abstract class.
- What is the 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?
- What is the 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 mean?
- Why can not an 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 getting and POST methods.
- How can we send the 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.
- Advantages of PDO over MySQLi approach.
- How to 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 the Xdebug extension?
- What is the purpose of the php.ini file?
- What is a curl?
- What is PDO in PHP?
- What is autoloading classes in PHP?
- Discuss die().
- What is the variable?
New features in PHP 7
- What are the return type declarations?
- Explain the Exception Hierarchy introduced in PHP 7?
- What is the use of the Spaceship Operator?
- What is the use of the Null Coalesce Operator?
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