Singleton PHP Library by John Smart (@thesmart)

A simple Singleton pattern, with optional support for named instances.

Example:

MyClass::setInstance(new MyClass());
$myClass = Singleton::getInstance();
$has = SingletonMock::hasInstance();

Named instances:

SingletonMock::setInstance($myClass, 'foobar');
$myClass = Singleton::getInstance('foobar');
$has = SingletonMock::hasInstance('foobar');

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Check out my others. @thesmart