PHP Classes

PHP Shortest Path Algorithm: Compute the shortest route between two points

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graphsolver 1.0.0GNU General Publi...5Algorithms, PHP 5, Geography


This class can compute the shortest route between to points.

It can take the names of start and end location and finds the shortest path using an algorithm loosely based on Dijkstra’s algorithm.

The paths between locations and them distance and time it takes to go from one to the other are retrieved from a MySQL database.

Instead of trying to resolve each branch of the tree, it computes the nearest nodes.

If a result is found, it is memorized. Then other solutions are searched.
If a shorter one is found, it replaces the longer one and eliminates the corresponding branch. If a longer one is found, the branch is eliminated.
If an equal one through a different route is found, it is added.

The package includes a class for localizing some text messages.

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If you don't want to use the i18N_T package, you'll have to replace all the calls to i18N_T() by gettext(), intl fonctions, or by sentences in your own language. This class is reasonably fast as once it has found solutions, they are recorded in the "chemins" table. You can, of course, rename the database, the tables and the fields to fit your habits. Once you are decided, you'll have to change the default values in constantes.php This class takes three parameters as input : the start point the end point the way the calculation is effectued (distance or time). It returns a graph object containing the collection of results (in collectionOK). Temporary branches are kept in list objets with the "liste" class (class.liste.php). This class tries to get rid of bad branches very quick to make the search faster. One important point : when adding records in th "vvd" table, always add the two directions (eg : A -> B and B-> A). The class knows which one it must use in a branche so that it doesn't loop. The "graph" class (class.graph.php) could be adapted for many other uses.
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Plain text file class.graph.php Class Main class
Plain text file class.liste.php Class Sub class for the lists
Accessible without login Plain text file constantes.php Conf. Defines constantes
Accessible without login Plain text file graph.php Example A basic example
Accessible without login Plain text file graph.sql Data Database source
Accessible without login Plain text file readme Doc. readme

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Files folder imagefr_FR.UTF-8 (1 file)

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Downloadgraphsolver-2016-10-03.tar.gz 6KB
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