How can you delete a file using a php function?

What function in PHP allows you to find the position of the first occurrence of a substring?

Which array function checks if the specified key exists in the array?

Which of the following is not related to file

What is the name of the function to check that the variable type is an object?

The ______ keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.

What will be the output? $example = true; example_y(); if ($example){ function example_x() { echo 'PHP\n'; } } if ($example)example_x(); function example_y() { echo 'Example\n'; } ?>

In the following PHP 7.1 code snippet, commenting or removing which code line will result in the successful compilation of the code? 1. 2. namespace X\Y\Z; 3. class Exception extends \Exception {} 4. $x = new Exception() 5. $y = new \Exception('hi'); 6. $z = new ArrayObject; 7. ?>

Which is NOT correct about PHP 7.1 variables?

Which can be used as a default value for parameters that are declared as iterable?

Output will be? $o = (object) array( var_dump(isset($o-> {'5'})); var_dump(key($o)); ?>