What are the differences between using var_dump and print_r functions for debugging in PHP, and when should each be used?

When debugging in PHP, var_dump() function is used to display the data type and value of a variable along with its length. On the other hand, print_r() function is used to display the structured information (array, object) in a more readable format. If you need detailed information about the variable including its data type and length, use var_dump(). If you want a more human-readable output for arrays and objects, use print_r().

// Using var_dump() for debugging
$variable = "Hello, World!";
var_dump($variable);

// Using print_r() for debugging
$array = array("apple", "banana", "cherry");
print_r($array);