Which function allows you to specify a start position of a string and length arguments to retrieve part of a string?

What's the output?

Which one displays the browser properties using PHP?

When using the POST method, variables are displayed in the URL:

What is the official website of PHP

mysqli_num_rows() function is used to:

To sort an associative array by key, use the ____ function.

The ____ function is used to create a constant.

The ____ function converts all of the letters in a string to capital letters.

The class ________ starts with the word class followed by the name of the class.

You use the ____ function to find the total number of elements in an array.