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Formerly rhumsaa/uuid. A PHP 5.4+ library for generating RFC 4122 version 1, 3, 4, and 5 universally unique identifiers (UUID).
Checking how undefined string and number variables handles truthiness
A simple utility to find out falsy values from an object or arrays.
Use hasNil to traverse chained object properties and check for null or undefined values.
Difference between null and undefined