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In my previous post about anonymous functions I mentioned that PHP 5.3 brought in some sweet semantic improvements. Namely, the release introduced the __invoke method and Closure class. Everytime you create a new anonymous function you are actually creating an instance of Closure, and when you…
Anonymous functions have enjoyed a long history with PHP. Well, some version of anonymous functions. PHP 4, released in the long-ago of 2000, had several functions that required the passing in of callbacks, including usort, array_map, and array_walk. To use these you could pass in a callable by name…