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Mphp by Sherif Ramadan (http://sheriframadan.com/mphp). Mphp is an operator precedence parser written in PHP and designed as an experimental API. The library currently only includes a parser class named Parser and a core class named Core that extends the parser. The parser may be used independently, but the core mainly provides a thin wrapper over the parser functions that allow for ease of use. The Parser class has three main functions: - Tokenize - Lex - Executor These functions must be called in that order to compute a result for the code supplied to the parser. The Tokenize method creates a list of tokens for the code. The Lex method performs a lexical analysis on those tokens to make sure they can be run through the executor. The Executor method then builds stack frames for each operator and its operands in the stack array and computes the result of each, storing the final result in the parser's result register. This can be accessed via the getResult method from the parser. The parser currently supports the following operators: + Addition - Subtraction - Negation * Multiplication % Modulation / Division ^ Exponentiation The parser sets the following precedence on these operators from lowest to highest precedence: Precedence Operator(s) 1 Addition, Subtraction 2 Multiplication, Division, Modulation 3 Exponentiation 4 Negation Operators with equal precedence are executed in the order they are defined. The parser also supports sub-group expressions denoted by opening and closing round braces (, ). (1 + 2) * 3 In the above example the round braces force addition to be carried out first even though multiplication has higher precedence in our precedence table. Precedence of operators is still maintained within every sub expression enclosed in opening and closing round braces. Any number value is allowed using digit characters 0 through 9 and optionally decimal values containing a single decimal place (denoted by '.') followed by any number of digit characters. Results have fixed precision based on PHP precision settings and no arbitrary precision can be guaranteed. * Usage: To use the API you can simply call the Core::evaluate() method with your supplied mathematical expression. The method returns the result directly. Example: echo Mphp\Core::evaluate("1 + 2"); To use the API as an instance of the core use the following: $Mphp = new Mphp\Core; $Mphp->compute("1 + 2"); // outputs 3 The main difference between the Core::compute() and Core::evaluate() methods is that the Core::evaluate() method instantiates a new Parser object and calls the Tokenize(), Lex(), Executor(), and getResult() methods on that Parser object directly, returning the result. This method may be called statically, but the Core::compute() method may not. The compute method requires an instance and reuses the same Parser object that it instantiates upon instantiating the Core class. To use the Parser as an instance without the core use the following: $parser = new Parser("1 + 2"); echo $parser->Tokenize()->Lex()->Executor()->getResult(); // outputs 3 This is equivalent to simply calling the compute or evaluate methods directly. However, if you instantiate the parser object on its own you must remember to recall the Tokenize(), Lex(), and Executor() methods each time you want to compute a new expression. The code maybe updated through the Parser::$code public property. $parser->code = "3 + 4"; echo $parser->Tokenize()->Lex()->Executor()->getResult(); // outputs 7 Future versions of the API may include the ability to use variable assignment and/or functions such as round, sqrt, log, ln, sin, cos, tan, and fact. Please note that the API is currently experimental and is likely to change.