Question:- Explain PHP variable length argument function.
Answer:- PHP supports variable length argument function. It means you can pass 0, 1 or n number of arguments.
Question:- What is the array in PHP?
Answer:- An array is used to store multiple values in a single value. In PHP, it orders maps of pairs of keys and values. It saves the collection of the data type.
Question:- How many types of array are there in PHP?
Answer:- There are three types of array in PHP: Indexed array: an array with a numeric key. Associative array: an array where each key has its specific value. Multidimensional array: an array containing one or more arrays within itself.
Question:- Explain some of the PHP array functions?
Answer:- There are many array functions in PHP: array(), array_change_key_case(), array_chunk(), count(), sort(), array_reverse(), array_search(), array_intersect()
Question:- What is the difference between indexed and associative array?
Answer:- The indexed array holds elements in an indexed form which is represented by number starting from 0 and incremented by 1. For example: $season=array("summer","winter","spring","autumn"); The associative array holds elements with name. For example: $salary=array("Sonoo"=>"350000","John"=>"450000","Kartik"=>"200000");
Question:- How to get the length of string?
Answer:- The strlen() function is used to get the length of the string.
Question:- Explain some of the PHP string functions?
Answer:- here are many array functions in PHP: strtolower(), strtoupper(), ucfirst(), lcfirst(), ucwords(), strrev(), strlen()
Question:- What are the methods to submit form in PHP?
Answer:- There are two methods GET and POST.
Question:- How can you submit a form without a submit button?
Answer:- You can use JavaScript submit() function to submit the form without explicitly clicking any submit button.
Question:- What are the ways to include file in PHP?
Answer:- PHP allows you to include file so that page content can be reused again. There are two ways to add the file in PHP. include require
Question:- Differentiate between require and include?
Answer:- Require and include both are used to include a file, but if data is not found include sends warning whereas require sends Fatal error.
Question:- Explain setcookie() function in PHP?
Answer:- PHP setcookie() function is used to set cookie with HTTP response. Once the cookie is set, you can access it by $_COOKIE superglobal variable.
Question:- What is Syntax of setcookie() function in PHP?
Answer:- bool setcookie ( string $name [, string $value [, int $expire = 0 [, string $path [, string $domain [, bool $secure = false [, bool $httponly = false ]]]]]] )
Question:- How can you retrieve a cookie value?
Answer:- echo $_COOKIE ["user"];