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vendor/webit/eval-math/README.md

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+Composer/Packagist version of EvalMath by Miles Kaufman
+Copyright (C) 2005 Miles Kaufmann <http://www.twmagic.com/>
+NAME
+----
+    EvalMath - safely evaluate math expressions
+  
+DESCRIPTION
+-----------
+    Use the EvalMath class when you want to evaluate mathematical expressions 
+    from untrusted sources.  You can define your own variables and functions,
+    which are stored in the object.  Try it, it's fun!
+        
+SYNOPSIS
+--------
+    `$m = new EvalMath;`
+    
+    `// basic evaluation:`
+    `$result = $m->evaluate('2+2');`
+    
+    `// supports: order of operation; parentheses; negation; built-in functions`
+    `$result = $m->evaluate('-8(5/2)^2*(1-sqrt(4))-8');`
+    
+    `// create your own variables`
+    `$m->evaluate('a = e^(ln(pi))');`
+    
+    `// or functions`
+    `$m->evaluate('f(x,y) = x^2 + y^2 - 2x*y + 1');`
+    
+    `// and then use them`
+    `$result = $m->evaluate('3*f(42,a)');`
+
+METHODS
+-------
+    `$m->evaluate($expr)`
+        Evaluates the expression and returns the result.  If an error occurs,
+        prints a warning and returns false.  If $expr is a function assignment,
+        returns true on success.
+    
+    `$m->e($expr)`
+        A synonym for $m->evaluate().
+    
+    `$m->vars()`
+        Returns an associative array of all user-defined variables and values.
+        
+    `$m->funcs()`
+        Returns an array of all user-defined functions.
+
+PARAMETERS
+----------
+    `$m->suppress_errors`
+        Set to true to turn off warnings when evaluating expressions
+
+    `$m->last_error`
+        If the last evaluation failed, contains a string describing the error.
+        (Useful when suppress_errors is on).