Google Maps Polyline Encoding Tool 
A simple PHP class for translating polyline into an encoded strings for Google Maps.
Install
The easist way to use this library is to clone the GitHub, build a distributed copy, and add the library into your application.
shell~> git clone git://github.com/emcconville/google-map-polyline-encoding-tool.git
shell~> make
shell~> cp dist/Polyline.php /path/to/your/application/includes/Polyline.php
Usage
Encoding
<?php
require_once 'Polyline.php';
// Points to encode
$points = array(
array(41.89084,-87.62386),
array(41.89086,-87.62279),
array(41.89028,-87.62277),
array(41.89028,-87.62385),
array(41.89084,-87.62386)
);
print Polyline::Encode($points);
?>Output:
wxt~Fd`yuOCuErBC?vEoB@
Decoding
<?php
require_once 'Polyline.php';
// String to decode
$str = "kiw~FpoavObBA?fAzEC";
$points = Polyline::Decode($str);
var_dump($points);
?>Output:
array(8) {
[0] =>
double(41.90374)
[1] =>
double(-87.66729)
[2] =>
double(41.90324)
[3] =>
double(-87.66728)
[4] =>
double(41.90324)
[5] =>
double(-87.66764)
[6] =>
double(41.90214)
[7] =>
double(-87.66762)
}
Specify precision
You can use the precision you want, just indicates it when using Encode and Decode
$points = Polyline::Decode($line, 6);
$line = Polyline::Encode($points, 6);
Singleton
The Polyline object can be initialized as a single object, and be referenced throughout an application.
<?php
require_once 'Polyline.php';
// Create singleton
$myPolyline = Polyline::Singleton();
// Create a polyline from an array of points
$myPolyline->polyline("tribune",array(41.89084,-87.62386,41.89086,-87.62279
41.89028,-87.62277,41.89028,-87.62385));
// Create a polyline from an encoded string
$myPolyline->polyline("dustygroove","kiw~FpoavObBA?fAzEC");
/* ... do work .. */
// Re-establish singleton object
$anotherPolyline = Polyline::Singleton();
var_dump( $anotherPolyline->getTribunePoints() );
var_dump( $anotherPolyline->getDustyGrooveEncoded() );
?>Output:
string(22) "wxt~Fd`yuOCuErBC?vEoB@"
array(8) {
[0] =>
double(41.90374)
[1] =>
double(-87.66729)
[2] =>
double(41.90324)
[3] =>
double(-87.66728)
[4] =>
double(41.90324)
[5] =>
double(-87.66764)
[6] =>
double(41.90214)
[7] =>
double(-87.66762)
}
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