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