Sr. PHP Programmer Interview Question:

What are the rules for determine the "truth" of any value not already of the Boolean type?

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Here are the rules for determine the "truth" of any value not already of the Boolean type −

☛ If the value is a number, it is false if exactly equal to zero and true otherwise.
☛ If the value is a string, it is false if the string is empty (has zero characters) or is the string "0", and is true otherwise.
☛ Values of type NULL are always false.
☛ If the value is an array, it is false if it contains no other values, and it is true otherwise. For an object, containing a value means having a member variable that has been assigned a value.
☛ Valid resources are true (although some functions that return resources when they are successful will return FALSE when unsuccessful).
☛ Don't use double as Booleans.
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