PHP online test

What is the use of explode function in PHP?

What will be the output of the code snippet?

 $a = '90';
 $b = &$a;
 $b = "2$b";
 echo $b;

Which function is used to remove duplicate values from an array in PHP?

Which one will print true?

 var_dump(0123 == 123);
 var_dump('0123' == 123);
 var_dump('0123' === 123);

Which one is true related with Header()?

Interface helps in the following?

What will be the output of the code snippet?

<?php
 $A = 5;
 echo $A+++$A++;

Interfaces can have private access modifier for abstract method?

What is the use of implode function in PHP?

Which of the following statement is wrong related to abstract class?