PHP - Interview Series - 3
Welcome to our PHP interview question blog!
PHP is a popular server-side programming language used for web development. As a PHP developer, it is essential to have a good understanding of the language and its features. In this blog, we will cover some of the most common and important PHP interview questions that can help you prepare for your next PHP job interview.
Whether you are a beginner in PHP or an experienced developer, this blog will provide you with a comprehensive set of PHP interview questions and answers. We will cover topics such as syntax, data types, arrays, functions, object-oriented programming, and more.
Our aim is to help you prepare for your PHP interview and provide you with the knowledge and confidence to succeed. So, let's get started and dive into the world of PHP interview questions!
- What is the use of the array_keys() function in PHP?
Answer: The array_keys() function is used to return all the keys or a subset of the keys of an array.
Example code:
$data = array("name" => "John", "age" => 30); $keys = array_keys($data);
- What is the use of the array_values() function in PHP?
Answer: The array_values() function is used to return all the values of an array, without the keys.
Example code:
$data = array("name" => "John", "age" => 30); $values = array_values($data);
- What is the use of the array_unique() function in PHP?
Answer: The array_unique() function is used to remove duplicate values from an array.
Example code:
$numbers = array(1, 2, 3, 2, 4, 5); $unique_numbers = array_unique($numbers);
- What is the use of the array_search() function in PHP?
Answer: The array_search() function is used to search an array for a specific value, and return its corresponding key.
Example code:
$numbers = array(1, 2, 3, 4, 5); $key = array_search(3, $numbers);
- What is the use of the array_flip() function in PHP?
Answer: The array_flip() function is used to exchange the keys and values of an array.
Example code:
$data = array("name" => "John", "age" => 30); $flipped_data = array_flip($data);
- What is the use of the array_rand() function in PHP?
Answer: The array_rand() function is used to randomly select one or more keys from an array.
Example code:
$numbers = array(1, 2, 3, 4, 5); $random_key = array_rand($numbers);
- What is the use of the array_fill() function in PHP?
Answer: The array_fill() function is used to fill an array with a specified value, and a specified number of elements.
Example code:
$filled_array = array_fill(0, 5, "Hello");
- What is the use of the array_chunk() function in PHP?
Answer: The array_chunk() function is used to split an array into chunks of a specified size.
Example code:
$numbers = array(1, 2, 3, 4, 5); $chunks = array_chunk($numbers, 2);
- What is the use of the explode() function in PHP?
Answer: The explode() function is used to split a string into an array, using a specified delimiter.
Example code:
$string = "Hello, World!"; $words = explode(",", $string);
- What is the use of the implode() function in PHP?
Answer: The implode() function is used to join the elements of an array into a string, using a specified delimiter.
Example code:
$words = array("Hello", "World!"); $string = implode(" ", $words);
- What is the use of the preg_match() function in PHP?
Answer: The preg_match() function is used to perform a regular expression match on a string.
Example code:
$string = "The quick brown fox"; $matches = array(); preg_match("/quick/", $string, $matches);
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