PHP 7 interview questions

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  • Explain Scalar type declarations in PHP7.
    Php 7

    Posted By: Francis

    Scalar type declarations is a new feature of PHP that is introduced in PHP 7. There are two options of Scalar type declaration are available.

    • Strict
    • Coercive

  • What are anonymous classes in PHP7.
    Php 7

    Posted By: Annie

    Anonymous Class in PHP is new way of creating object without the need to name them. Anonymous classes are created and initiated at same time.

    Example of an Anonymous Class in PHP

    $object =new class('argument'){
    public $property;
    public function __construct($argument){

  • What is Coercive mode in PHP?
    Php 7

    Posted By: Gene

    Coercive mode in PHP is the default mode of Scalar type declarations (Feature introduced in PHP 7).

  • What is Strict mode in PHP?
    Php 7

    Posted By: Prashant

    Strict mode is new feature in PHP in which variable declaration is required before using it.

  • What are Array constants?
    Php 7

    Posted By: Dana

    In PHP 5.6 or we can define constants as a scalar expression. We can define an array constant using the define keyword.

    Array Constant Example in PHP

     define('fruits', [
     print(fruits[2]); // outputs banana

  • Explain Spaceship Operator?
    Php 7

    Posted By: Marcel

    Spaceship operator also is known as (combined comparison operator) is a new operator introduced in PHP 7. This operator is denoted by "<=>". This single operator can perform greater than, less than, and equal comparison between two operands. Its behavior is similar like strcmp() or version_compare() functions and can be used with integers, floats, strings, arrays, objects, etc.

  • What is use of random_bytes() in PHP?
    Php 7

    Posted By: EvgeniaAnd

    random_bytes() function in PHP is used to generate cryptographically secure pseudo-random bytes.


    String random_bytes ( int $length )


    $length = random_bytes('4'); 
    //Print the reult and convert by binaryhexa 

  • List some features of PHP that are deprecated in PHP 7?
    Php 7

    Posted By: Manjiri Kulkarni

    PHP Features that are deprecated in PHP 7 are.

    • PHP 4 style constructors
    • Static calls to non-static methods
    • password_hash() salt option
    • capture_session_meta SSL context option

  • What is use of set_exception_handler() in PHP?
    Php 7

    Posted By: Anonymous

    set_exception_handler() is a library function in PHP. It is used to set the default exception handler if an exception is not caught within a try/catch block in PHP.exception_handler stop the execution of script.

  • List some extensions have been removed from PHP 7?
    Php 7

    Posted By: Sol

    Following extensions are removed from PHP and are no longer in use

    • ereg
    • mssql
    • mysql
    • sybase_ct

    Read More from

  • What's new in PHP7?
    Php 7

    Posted By: Sim

    New features of PHP 7 are  - 

    1. Scalar type declaration
    2. Return type declarations
    3. Null coalescing operator
    4. Spaceship operator
    5. Constant arrays using define
    6. Anonymous classes
    7. Unicode codepoint escape syntax
    8. Closure::call
    9. Filtered unserialize
    10. IntlChar
    11. Expectations
    12. Group use declarations
    13. Generator Return Expressions
    14. Generator delegation
    15. Integer division with intdiv
    16. Session options
    17. preg_replace_callback_array
    18. CSPRNG Functions

  • How to upgrade the version of PHP 5 to PHP 7?
    Php 7

    Posted By: General

  • What is Null Coalesce Operator?
    Php 7

    Posted By: Rubin

    Null Coalesce Operator (??) is introduced in PHP 7. This operator is used as a replacement of isset() along with the ternary operator (?:). The Null Coalesce operator (??) returns the result of its first operand if it exists and is not NULL, or else it will return its second operand.