Add logging functions

php/logging.php

@@ -0,0 +1,29 @@
+<?php
+//define("DEBUG", null);
+define("LOG_FILE", __DIR__ . "/../php.log");
+define("PREFIX_ERROR", "Error: ");
+
+function log_print($string)
+{
+	if(defined("DEBUG") && !defined("NO_ECHO")) {
+		echo $string . "<br>";
+		return;
+	}
+
+	$handle = fopen(LOG_FILE, "a");
+	if (!$handle) { 
+		echo "Unable to open file.<br>";
+		return;
+	}
+	
+	if (!fwrite($handle, $string . "\n")) {
+		echo "Unable to write to file.<br>";
+	}
+	fclose($handle);
+}
+
+function log_error($string)
+{
+	log_print(PREFIX_ERROR . $string);
+}
+?>