logger class (very usefull for debugging)

resources/classes/logging.php

@@ -0,0 +1,53 @@
+ <?php
+ /**
+ * Logging class:
+ * - contains lfile, lwrite and lclose public methods
+ * - lfile sets path and name of log file
+ * - lwrite writes message to the log file (and implicitly opens log file)
+ * - lclose closes log file
+ * - first call of lwrite method will open log file implicitly
+ * - message is written with the following format: [d/M/Y:H:i:s] (script name) message
+ */
+class Logging {
+    // declare log file and file pointer as private properties
+    private $log_file, $fp;
+    // set log file (path and name)
+    public function lfile($path) {
+        $this->log_file = $path;
+    }
+    // write message to the log file
+    public function lwrite($message) {
+        // if file pointer doesn't exist, then open log file
+        if (!$this->fp) {
+            $this->lopen();
+        }
+        // define script name
+        $script_name = pathinfo($_SERVER['PHP_SELF'], PATHINFO_FILENAME);
+        // define current time and suppress E_WARNING if using the system TZ settings
+        // (don't forget to set the INI setting date.timezone)
+        $time = @date('[d/M/Y:H:i:s]');
+        // write current time, script name and message to the log file
+        fwrite($this->fp, "$time ($script_name) $message" . PHP_EOL);
+    }
+    // close log file (it's always a good idea to close a file when you're done with it)
+    public function lclose() {
+        fclose($this->fp);
+    }
+    // open log file (private method)
+    private function lopen() {
+        // in case of Windows set default log file
+        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
+            $log_file_default = 'c:/php/logfile.txt';
+        }
+        // set default log file for Linux and other systems
+        else {
+            $log_file_default = '/tmp/logfile.txt';
+        }
+        // define log file from lfile method or use previously set default
+        $lfile = $this->log_file ? $this->log_file : $log_file_default;
+        // open log file for writing only and place file pointer at the end of the file
+        // (if the file does not exist, try to create it)
+        $this->fp = fopen($lfile, 'a') or exit("Can't open $lfile!");
+    }
+}
+?>