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A recursive function is a function that calls itself, in order to solve a problem. This type of function is often used in situations where a problem can be broken down into smaller, similar yet smaller problems. The function keeps calling itself with modified arguments until a base case is reached, at which point the function stops calling itself and starts returning values. So, do we know all the recursive functions in PHP?
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How to Clean After Oneself in PHP : use register_shutdown_function, __destruct and try-finally to make sure the cleaning always happen
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All PHP native classes, ranked by usage frequency. Good base to make sure that one know the commonly used PHP classes.