[PHP] Add rudimentary example

Author: lierdakil

examples/polish-notation-calc/php/.gitignore

@@ -1,2 +1,3 @@
-lexer.*
-parser.*
+Lexer.*
+Parser.*
+*.txt

examples/polish-notation-calc/php/main.php

@@ -0,0 +1,12 @@
+<?php
+namespace Alpaca;
+
+require './Lexer.php';
+
+$debug = $argv[1] == '-d';
+while($f = fgets(STDIN)){
+    $lexer = new Lexer(rtrim($f), $debug);
+    while(($token = $lexer->getNextToken())[0] !== Lexer::TOKEN_TYPE_EOF) {
+      echo(Lexer::tokenToString($token[0]) . ", " . $token[1] . "\n");
+    }
+}

examples/polish-notation-calc/php/test.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+${alpaca:-alpaca} -l php $args syntax.xy &&\
+  php main.php "$@" <<< "$input"