Kill Your Tech Interview
Top 82 PHP Interview Questions
Entry Junior Mid Senior Expert
Theoretical Questions
Q1:
What is the use of ini_set()?
ini_set()? Entry
Q2:
What is the return type of a function that doesn't return anything?
Entry
Q3:
What does $GLOBALS mean?
$GLOBALS mean? Entry
Q4:
How can you pass a variable by reference?
Entry
Q5:
What is the purpose of php.ini file?
php.ini file? Entry
Q6:
What are the keys & values in an indexed array?
Entry
Q7:
What is the difference between == and ===?
== and ===? Entry
Q8:
What are the differences between die() and exit() functions in PHP?
die() and exit() functions in PHP? Junior
Q9:
Is multiple inheritance supported in PHP?
Junior
Q10:
Explain what the different PHP errors are
Junior
Q11:
Explain usage of enumerations in PHP
Junior
Q12:
Explain how we handle exceptions in PHP?
Junior
Q13:
What are the main differences between const vs define
Junior
Q14:
What's the difference between isset() and array_key_exists()?
isset() and array_key_exists()? Junior
Q15:
Can you extend a Final defined class?
Junior
Q16:
What are PSRs? Choose 1 and briefly describe it.
Junior
Q17:
How can you enable error reporting in PHP?
Junior
Q18:
When should I use require vs include?
require vs include? Junior
Q19:
What are the different scopes of variables?
Junior
Q20:
What is the difference between var_dump() and print_r()?
var_dump() and print_r()? Junior
Q21:
What is the difference between single-quoted and double-quoted strings in PHP?
Junior
Q22:
How is it possible to set an infinite execution time for PHP script?
Junior
Q23:
Give me some real life examples when you had to use __destruct in your classes
__destruct in your classes Junior
Q24:
In PHP, objects are they passed by value or by reference?
Junior
Q25:
What is the differences between $a != $b and $a !== $b?
$a != $b and $a !== $b? Junior
Q26:
Differentiate between echo and print()
print() Junior
Q27:
What is stdClass in PHP?
stdClass in PHP? Junior
Q28:
What does the 'var' keyword mean in PHP?
Junior
Q29:
Is there a difference between isset and !empty?
!empty? Junior
Q30:
What do we mean by keys and values?
Junior
Q31:
What is PDO in PHP?
Junior
Q32:
What is the difference between MySQL, MySQLi and PDO?
Mid Q33:
Is there a function to make a copy of a PHP array to another?
Mid Q34:
Does PHP support method overloading?
Mid Q35:
What is use of Null Coalesce Operator?
Mid Q36:
What is the difference between using self and $this?
self and $this? Mid Q37:
Explain function call by reference
Mid Q38:
Why do we use extract()?
extract()? Mid Q39:
What is autoloading classes in PHP?
Mid Q40:
Differentiate between parameterised and non parameterised functions
Mid Q41:
What are some of the big changes PHP has gone through in the past few years?
Mid Q42:
Explain the difference between exec() vs system() vs passthru()?
exec() vs system() vs passthru()? Mid Q43:
Is there any reason to use strcmp() for strings comparison?
strcmp() for strings comparison? Mid Q44:
Explain the difference between shell_exec() and exec()
shell_exec() and exec() Mid Q45:
What is the difference between a PHP interpreter and a PHP handler?
Mid Q46:
What is the difference between PDO's query() vs execute()?
query() vs execute()? Mid Q47:
Maximum how many arguments are allowed in a function in PHP?
Mid Q48:
Are Parent constructors called implicitly inside a class constructor?
Mid Q49:
When should I use require_once vs require?
require_once vs require? Mid Q50:
Differentiate between exception and error
Mid Q51:
What exactly is the the difference between array_map, array_walk and array_filter?
array_map, array_walk and array_filter? Mid Q52:
What are the exception class functions?
Mid Q53:
What is the crucial difference between using traits versus interfaces?
Senior Q54:
What's better at freeing memory with PHP: unset() or $var = null?
unset() or $var = null? Senior Q55:
Does PHP have threading?
Senior Q56:
What does yield mean in PHP?
yield mean in PHP? Senior Q57:
Compare MySQLi or PDO - what are the pros and cons?
Senior Q58:
What are the disadvantages of using persistent connection in PDO?
Senior Q59:
What does $$ mean?
$$ mean? Senior Q60:
How to turn errors into exceptions in PHP?
Senior Q61:
Is PHP single or multi threaded?
Senior Q62:
Store an array as JSON or as a PHP serialized array?
Senior Q63:
What exactly are late static bindings in PHP?
Senior Q64:
What is the best method to merge two PHP objects?
Senior Q65:
What is use of Spaceship Operator?
Senior Q66:
explain what is a closure in PHP and why does it use the “use” identifier?
Senior Q67:
Explain the Exception Hierarchy introduced in PHP7
Senior Q68:
What does a $$$ mean in PHP?
$$$ mean in PHP? Expert Q69:
Explain the Order of Precedence for Traits in PHP
Expert Q70:
Are PDO prepared statements sufficient to prevent SQL injection?
Expert Code Challenges
Q1:
PHP array delete by value (not key)
Junior Q2:
Declare some function with default parameter
Junior Q3:
What will be returned by this code?
Mid Q4:
What does the following code output?
Mid Q5:
How do I pass variables and data from PHP to JavaScript?
Mid Q6:
What will be returned by this code? Explain the result.
Mid Q7:
Check if PHP array is associative
Mid Q8:
Let's create Enumerations for PHP. Prove some code examples.
Mid Q9:
How would you create a Singleton class using PHP?
Mid Q10:
How to measure execution times of PHP scripts?
Senior Q11:
How could we implement method overloading in PHP?
Expert Q12:
Provide some ways to mimic multiple constructors in PHP
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