Equation Operating System
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This class solves equations with multiple variables.
It does not resort to the PHP eval() function to help prevent security risks of using malicious expression values for instance with a calculator that takes expressions defined by the users.
It comes with a sub-class that can produce graphic charts plotting the curve defined by the equation expression withing a given range of x and y values. The generate chart graphics can be outputted in the PNG or JPEG formats using the GD library.
It does not resort to the PHP eval() function to help prevent security risks of using malicious expression values for instance with a calculator that takes expressions defined by the users.
It comes with a sub-class that can produce graphic charts plotting the curve defined by the equation expression withing a given range of x and y values. The generate chart graphics can be outputted in the PNG or JPEG formats using the GD library.
| Classes of Jon Lawrence | > | Equation Operating System | > | Download .zip .tar.gz | > |  Support forum |
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Graphics | Colors, images, charts and picture formats | View top rated classes |
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Math | Math related classes. | View top rated classes |
| Innovation Award | ||
 January 2005 Number 2 Prize: One downloadable copy of Komodo Pro |
Solving equations can have many applications, like for instance, drawing charts that represent the curves defined by assigning values of given ranges to the variables of the equations. The PHP eval() function can be used to dynamically evaluate the expressions defined by an equation. However, it may be dangerous to evaluate an arbitrary expression provided by an user, as it may contain malicious code. This class provides an alternative solution that consists in a full expressions parser and evaluator that only supports a limited set of operations that do not represent a security risk when the operations are evaluated. Manuel Lemos |
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| Trackback links | ||
| Link | Description |
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| complex mathematical operations (Turkish) | For these complex equations there is a class... |
| Applications that use this class | ||
| Link | Description |
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| Equation Grapher | Online graphing calculator |
If you know an application of this package, send a message to the author to add a link here.| Files |
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| File | Role | Description |
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 README.md |
Doc. | Description of class functionality and use cases |
| eos.class.php |
Class | Main EOS Class |
| index.php |
Example | Example usage of graphing function |
| stack.class.php |
Class | Supporting 'stack' class |
| Download all files: eos.tar.gz eos.zip |
For more information send a message to info at phpclasses dot org.
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