Dijkstra

.gitignore

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+.idea/
+vendor/

.travis.yml

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+language: php
+
+php:
+  - 5.6
+  - 5.5
+  - 5.4
+  - 5.3
+
+install:
+  - composer install --dev --no-interaction
+
+script:
+  - mkdir -p build/logs
+  - phpunit --coverage-clover build/logs/clover.xml
+
+after_script:
+  - php vendor/bin/coveralls -v
+  - CODECLIMATE_REPO_TOKEN=4a5c02026c25f24ff6314ad888d40491ad64b2347c9ea3e985b541389404d438 ./vendor/bin/test-reporter

CHANGELOG.md

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+CHANGE LOG
+==========
+
+## 1.0.0 (2015-02-15)
+ - Dijkstra.

README.md

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+[![Build Status](https://travis-ci.org/fisharebest/algorithm.svg)](https://travis-ci.org/fisharebest/algorithm)
+[![Coverage Status](https://coveralls.io/repos/fisharebest/algorithm/badge.svg?branch=master)](https://coveralls.io/r/fisharebest/algorithm?branch=master)
+[![SensioLabsInsight](https://insight.sensiolabs.com/projects/4997a2c6-fb22-433e-92c5-ae7285f1a5a0/mini.png)](https://insight.sensiolabs.com/projects/4997a2c6-fb22-433e-92c5-ae7285f1a5a0)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/fisharebest/algorithm/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/fisharebest/algorithm/?branch=master)
+[![Code Climate](https://codeclimate.com/github/fisharebest/algorithm/badges/gpa.svg)](https://codeclimate.com/github/fisharebest/algorithm)
+
+# fisharebest/algorithm
+
+General purpose algorithms in PHP
+
+## Installation
+
+Use [composer](https://getcomposer.org), and add `"fisharebest/algorithm": "*"` to the dependencies in your `composer.json`.
+
+
+## Dijkstra
+
+[Dijkstra's algorithm](https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm) finds the
+shortest path(s) between two nodes in a weighted, directed graph.
+
+Graphs are specified as an array of edges, each with a cost.  The example below is
+an undirected graph (i.e. if D→E is 9, then E→D is also 9.), because it is easy to
+understand and easy to draw.  However, the algorithm works equally well for undirected
+graphs, where links can be one-way only or have different costs in each direction.
+```
+     D---9---E
+    / \       \
+  14   2       6
+  /     \       \
+ A---9---B--11--C
+  \     /      /
+   7  10      /
+    \ /      /
+     F-----15       G
+```
+
+Sample code for the above graph.
+
+``` php
+use Fisharebest\Algorithm\Dijkstra;
+
+$graph = array(
+  'A' => array('B' => 9, 'D' => 14, 'F' => 7),
+  'B' => array('A' => 9, 'C' => 11, 'D' => 2, 'F' => 10),
+  'C' => array('B' => 11, 'E' => 6, 'F' => 15),
+  'D' => array('A' => 14, 'B' => 2, 'E' => 9),
+  'E' => array('C' => 6, 'D' => 9),
+  'F' => array('A' => 7, 'B' => 10, 'C' => 15),
+  'G' => array(),
+);
+
+$dijkstra = new Dijkstra($graph);
+
+// There can be zero, one or more shortest (i.e. same total cost) paths.
+
+// No shortest path.
+$path = $dijkstra->shortestPaths('A', 'G'); // array()
+
+// Exactly one shortest path.
+$path = $dijkstra->shortestPaths('A', 'E'); // array(array('A', 'B', 'D', 'E'))
+
+// Multiple solutions with the same shortest path.
+$path = $dijkstra->shortestPaths('E', 'F'); // array(array('E', 'D', 'B', 'F'), array('E', 'C', 'F'))
+
+// To find next-shortest paths, exclude one or intermediate nodes from the shortest path.
+$path = $dijkstra->shortestPaths('A', 'E'); // array(array('A', 'B', 'D', 'E'))
+$path = $dijkstra->shortestPaths('A', 'E', array('B')); // array(array('A', 'B', 'D', 'E'))
+$path = $dijkstra->shortestPaths('A', 'E', array('D')); // array(array('A', 'B', 'C', 'E'))
+$path = $dijkstra->shortestPaths('A', 'E', array('B', 'D')); // array(array('A', 'F', 'C', 'E'))
+
+
+```
+

composer.json

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+{
+	"name": "fisharebest/algorithm",
+	"description": "Implementation of standard algorithms in PHP.",
+	"type": "library",
+	"keywords": [
+		"algorithm", "dijkstra"
+	],
+	"homepage": "https://github.com/fisharebest/algorithm",
+	"license": "GPL-3.0+",
+	"authors": [{
+			"name": "Greg Roach",
+			"email": "greg@subaqua.co.uk",
+			"role": "Developer"
+	}],
+	"support": {
+			"issues": "https://github.com/fisharebest/algorithm/issues"
+	},
+	"require": {
+		"php": ">=5.3.0"
+	},
+	"require-dev": {
+		"phpunit/phpunit": "*",
+		"satooshi/php-coveralls": "*"
+	},
+	"autoload": {
+		"psr-4": {
+			"Fisharebest\\Algorithm\\": "src/"
+		}
+	},
+	"scripts": {
+		"post-install-cmd": [
+			"composer dump-autoload --optimize"
+		],
+		"post-update-cmd": [
+			"composer dump-autoload --optimize"
+		]
+	}
+}