Add benchmark script to tests directory for easy benchmarking.

tests/benchmark.php

@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Benchmark Altorouter
+ *
+ * Usage: php ./tests/benchmark.php <iterations>
+ *
+ * Options:
+ *
+ * <iterations>:
+ * The number of routes to map & match. Defaults to 1000.
+ */
+
+require __DIR__ . '/../vendor/autoload.php';
+
+global $argv;
+$n = isset( $argv[1] ) ? intval( $argv[1] ) : 1000;
+
+// generates a random request url
+function random_request_url( $length = 20 ) {
+    $characters = '0123456789abcdefghijklmnopqrstuvwxyz/';
+    $charactersLength = strlen($characters);
+    $randomString = '/';
+    for ($i = 0; $i < $length; $i++) {
+        $randomString .= $characters[rand(0, $charactersLength - 1)];
+    }
+    return $randomString;
+}
+
+// generate a random request method
+function random_request_method() {
+    static $methods = array( 'GET', 'GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'GET|POST', 'PUT|POST' );
+    $random_key = array_rand( $methods );
+    return $methods[ $random_key ];
+}
+
+
+$router = new AltoRouter();
+
+// map 1000 random routes
+for( $i=0; $i < $n; $i++ ) {
+    $router->map( random_request_method(), random_request_url(), function() {} );
+}
+
+// match 1000 random routes
+$start = microtime(true);
+for( $i=0; $i < $n; $i++ ) {
+    $router->match( random_request_url(), random_request_method() );
+}
+$end = microtime( true );
+
+// print execution time
+echo "Time: " . number_format(( $end - $start ), 4 ). ' seconds' . PHP_EOL;
+echo "Peak memory usage: " . ( memory_get_peak_usage( true ) / 1024 / 1024 ) . 'MB';