How to create a logfile in php

Php Problem Overview

I want to create a logfile for my system to register/log every action they do inside the system. But I have no idea how to do it.

For example, I have this php code that does the login function.

public function hasAccess($username,$password){
	$form = array();
	$form['username'] = $username;
	$form['password'] = $password;
	

	$securityDAO = $this->getDAO('SecurityDAO');
	$result = $securityDAO->hasAccess($form);
	//var_dump($form);
	//var_dump($result);
	if($result[0]['success']=='1'){
		$this->Session->add('user_id', $result[0]['id']);
		//$this->Session->add('username', $result[0]['username']);
		//$this->Session->add('roleid', $result[0]['roleid']);
		return $this->status(0,true,'auth.success',$result);
	}else{
		return $this->status(0,false,'auth.failed',$result);
	}
}

now I want to create a logfile entitled 'the date today', then when that functions is used for loging in, it will write that user has logged in, the same with other functions. But I only want a single file for every day.

Could anyone be kind enough to guide and teach me how I should do my codes?

Php Solutions

Solution 1 - Php

To write to a log file and make a new one each day, you could use date("j.n.Y") as part of the filename.

//Something to write to txt log
$log  = "User: ".$_SERVER['REMOTE_ADDR'].' - '.date("F j, Y, g:i a").PHP_EOL.
        "Attempt: ".($result[0]['success']=='1'?'Success':'Failed').PHP_EOL.
        "User: ".$username.PHP_EOL.
        "-------------------------".PHP_EOL;
//Save string to log, use FILE_APPEND to append.
file_put_contents('./log_'.date("j.n.Y").'.log', $log, FILE_APPEND);

So you would place that within your hasAccess() method.

public function hasAccess($username,$password){
	$form = array();
	$form['username'] = $username;
	$form['password'] = $password;

	$securityDAO = $this->getDAO('SecurityDAO');
	$result = $securityDAO->hasAccess($form);

	//Write action to txt log
	$log  = "User: ".$_SERVER['REMOTE_ADDR'].' - '.date("F j, Y, g:i a").PHP_EOL.
			"Attempt: ".($result[0]['success']=='1'?'Success':'Failed').PHP_EOL.
			"User: ".$username.PHP_EOL.
			"-------------------------".PHP_EOL;
    //-
	file_put_contents('./log_'.date("j.n.Y").'.txt', $log, FILE_APPEND);
	
	if($result[0]['success']=='1'){
		$this->Session->add('user_id', $result[0]['id']);
		//$this->Session->add('username', $result[0]['username']);
		//$this->Session->add('roleid', $result[0]['roleid']);
		return $this->status(0,true,'auth.success',$result);
	}else{
		return $this->status(0,false,'auth.failed',$result);
	}
}

Solution 2 - Php

create a logfile in php, to do it you need to pass data on function and it will create log file for you.

function wh_log($log_msg)
{
	$log_filename = "log";
	if (!file_exists($log_filename)) 
	{
		// create directory/folder uploads.
		mkdir($log_filename, 0777, true);
	}
	$log_file_data = $log_filename.'/log_' . date('d-M-Y') . '.log';
    // if you don't add `FILE_APPEND`, the file will be erased each time you add a log
    file_put_contents($log_file_data, $log_msg . "\n", FILE_APPEND);
} 
// call to function
wh_log("this is my log message");

Solution 3 - Php

Please check with this documentation.

http://php.net/manual/en/function.error-log.php

Example:

<?php
// Send notification through the server log if we can not
// connect to the database.
if (!Ora_Logon($username, $password)) {
    error_log("Oracle database not available!", 0);
}

// Notify administrator by email if we run out of FOO
if (!($foo = allocate_new_foo())) {
    error_log("Big trouble, we're all out of FOOs!", 1,
               "[email protected]");
}

// another way to call error_log():
error_log("You messed up!", 3, "/var/tmp/my-errors.log");
?>

Solution 4 - Php

Agree with the @jon answer. Just added modified the path to create the log directory inside the root

 function wh_log($log_msg) {
    $log_filename = $_SERVER['DOCUMENT_ROOT']."/log";
    if (!file_exists($log_filename))
    {
        // create directory/folder uploads.
        mkdir($log_filename, 0777, true);
    }
    $log_file_data = $log_filename.'/log_' . date('d-M-Y') . '.log';
    file_put_contents($log_file_data, $log_msg . "\n", FILE_APPEND);
}

wh_log('log to file');

just added $_SERVER['DOCUMENT_ROOT']

Solution 5 - Php

Please check this code, it works fine for me.

$data = array('shopid'=>3,'version'=> 1,'value=>1');  //here $data is dummy varaible

error_log(print_r($data,true), 3, $_SERVER['DOCUMENT_ROOT']."/your-file-name.log");

//In $data we can mention the error messege and create the log

Solution 6 - Php

You could use built-in function trigger_error() to trigger user errors/warnings/notices and set_error_handler() to handle them. Inside your error handler you might want to use error_log() or file_put_contents() to store all records on files. To have a single file for every day just use something like sprintf('%s.log', date('Y-m-d')) as filename. And now you should know where to start... :)

Solution 7 - Php

This is my working code. Thanks to Paulo for the links. You create a custom error handler and call the trigger_error function with the correct $errno exception, even if it's not an error. Make sure you can write to the log file directory without administrator access.

<?php
	$logfile_dir = "C:\workspace\logs\\";   // or "/var/log/" for Linux
	$logfile = $logfile_dir . "php_" . date("y-m-d") . ".log";
	$logfile_delete_days = 30;

    function error_handler($errno, $errstr, $errfile, $errline)
    {
        global $logfile_dir, $logfile, $logfile_delete_days;

        if (!(error_reporting() & $errno)) {
            // This error code is not included in error_reporting, so let it fall
            // through to the standard PHP error handler
            return false;
        }

        $filename = basename($errfile);

        switch ($errno) {
            case E_USER_ERROR:
                file_put_contents($logfile, date("y-m-d H:i:s.").gettimeofday()["usec"] . " $filename ($errline): " . "ERROR >> message = [$errno] $errstr\n", FILE_APPEND | LOCK_EX);
                exit(1);
                break;

            case E_USER_WARNING:
                file_put_contents($logfile, date("y-m-d H:i:s.").gettimeofday()["usec"] . " $filename ($errline): " . "WARNING >> message = $errstr\n", FILE_APPEND | LOCK_EX);
                break;

            case E_USER_NOTICE:
                file_put_contents($logfile, date("y-m-d H:i:s.").gettimeofday()["usec"] . " $filename ($errline): " . "NOTICE >> message = $errstr\n", FILE_APPEND | LOCK_EX);
                break;

            default:
                file_put_contents($logfile, date("y-m-d H:i:s.").gettimeofday()["usec"] . " $filename ($errline): " . "UNKNOWN >> message = $errstr\n", FILE_APPEND | LOCK_EX);
                break;
        }

        // delete any files older than 30 days
        $files = glob($logfile_dir . "*");
        $now   = time();

        foreach ($files as $file)
            if (is_file($file))
                if ($now - filemtime($file) >= 60 * 60 * 24 * $logfile_delete_days)
                    unlink($file);

        return true;    // Don't execute PHP internal error handler
    }

	set_error_handler("error_handler");

	trigger_error("testing 1,2,3", E_USER_NOTICE);
?>

Solution 8 - Php

Use below function

// Enable error reporting
ini_set('display_errors', 1);
//Report runtime errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);
//error_reporting(E_ALL & ~E_NOTICE);
// Tell php where your custom php error log is
ini_set('error_log', 'php_error.log');

$dateTime=date("Y-m-d H:i:s");
$ip= $_SERVER['REMOTE_ADDR'];
$errorString="Error occured on time $dateTime by ip $ip";
$php_error_msg.=$errorString;
// Append the error message to the php-error log
//error_log($php_error_msg);
error_log("A custom error has been triggered",1,"email_address","From: email_address");

Above function will create a log in file php_error with proper description and email will be sent.

Solution 9 - Php

For printing log use this function, this will create log file in log folder. Create log folder if its not exists .

logger("Your msg in log ", "Filename you want ", "Data to be log string or array or object");


function logger($logMsg="logger", $filename="logger", $logData=""){		
			$log  = date("j.n.Y h:i:s")." || $logMsg : ".print_r($logData,1).PHP_EOL .     				
			"-------------------------".PHP_EOL;
			file_put_contents('./log/'.$filename.date("j.n.Y").'.log', $log, FILE_APPEND);						
	}

Solution 10 - Php

A custom log function (for php server):

Features:

logs will be hidden (invisible) to public (without doing setting on server)

easy to read logs data

function log_it($info)
{
$filename = $_SERVER['DOCUMENT_ROOT'] . '/' . '1LOGS.php';
$dieCode = "<?php die();?>";
$fileStart = @file_get_contents($filename, false, null, 0, 14);
if ($fileStart) {
    if ($fileStart !== $dieCode)
        file_put_contents($filename, $dieCode . file_get_contents($filename));
} else file_put_contents($filename, $dieCode);

if (is_string($info) || is_int($info) || is_float($info)) $txt = '    ' . $info;
elseif (is_array($info) || is_object($info)) $txt = PHP_EOL . '    ' . print_r($info, true);
else $txt = '    ' . 'Data Type: ' . gettype($info);
file_put_contents(
    $filename,
    PHP_EOL . '>>> ( Date:' . date("Y:m:d H:i:s") . ' )' . $txt,
    FILE_APPEND
);
}

inform if it has room for improvement

Content Type	Original Author	Original Content on Stackoverflow
Question	maecy m	View Question on Stackoverflow
Solution 1 - Php	Lawrence Cherone	View Answer on Stackoverflow
Solution 2 - Php	JON	View Answer on Stackoverflow
Solution 3 - Php	Surabhil Sergy	View Answer on Stackoverflow
Solution 4 - Php	Manish	View Answer on Stackoverflow
Solution 5 - Php	Pasupathi Thangavel	View Answer on Stackoverflow
Solution 6 - Php	user222758	View Answer on Stackoverflow
Solution 7 - Php	xinthose	View Answer on Stackoverflow
Solution 8 - Php	vritika	View Answer on Stackoverflow
Solution 9 - Php	Ashwani Panwar	View Answer on Stackoverflow
Solution 10 - Php	proseosoc	View Answer on Stackoverflow