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POPHP - Implement logging mechanism to file in several classes
 

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    <p>I would like to implement logging mechanism to file in PHP:</p> <ol> <li>log file path will be in config file config.php</li> <li>in several classes I would like to log some events into the log file</li> </ol> <p>For example:</p> <pre><code> Class A { public function f_A { log_to_file($message); } } Class B { public function f_B { log_to_file($message); } } </code></pre> <p>I will be very grateful for any tips. I would like to implement some easy and elegant solution.</p> <p>I was thinking about it (thank you for your answers) and I think I will do it this way (maybe, there are some errors, I was writing it from scratch):</p> <pre><code>interface Logger { public function log_message($message); } class LoggerFile implements Logger { private $log_file; public function __construct($log_file) { $this-&gt;log_file = $log_file; } public function log_message($message) { if (is_string($message)) { file_put_contents($this-&gt;log_file, date("Y-m-d H:i:s")." ".$message."\n", FILE_APPEND); } } } //maybe in the future logging into database class LoggerDb implements Logger { private $db; public function __construct($db) { //some code } public function log_message($message) { //some code } } Class A { private $logger; public function __construct(Logger $l) { $this-&gt;logger = $l; } public function f_A { $this-&gt;logger-&gt;log_message($message); } } Class B { private $logger; public function __construct(Logger $l) { $this-&gt;logger = $l; } public function f_B { $this-&gt;logger-&gt;log_message($message); } } //usage: //in config.php: define("CONFIG_LOG_FILE", "log/app_log.log"); //in the index.php or some other files $logger = new LoggerFile(CONFIG_LOG_FILE); $instance_a = new A($logger); $instance_b = new B($logger); </code></pre>
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