Interface defines the methods and their parameters. Class can then implement the interface (or multiple interfaces) and needs to define such methods. So interface defines outline and class-specific behaviour.
Tell me in PHP, objects are they passed by value or by reference?
Tell me how do I check if a given variable is empty?
Tell me what is the main difference between PHP 4 and PHP 5?
Do you know how to delete a file from the system?
How to create a mysql connection in PHP?
Tell us how to set cookies in PHP?
Explain what is the difference between mysql_fetch_array() and mysql_fetch_assoc()?
Tell me what are the functions to be used to get the image’s properties (size, width and height)?
Explain which cryptographic extension provide generation and verification of digital signatures?
Suppose the variable $var1 is set to 10 and the $var2 is set to the character var1, what’s the value of $$var2?
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