How to create a logfile in php - php

Question

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 code?

Answer 1

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);
}
}

Answer 2

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");

Answer 3

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']

Answer 4

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

Answer 5

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

Answer 6

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... :)

Answer 7

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);
?>

Answer 8

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.

Answer 9

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);
}

Answer 10

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

Answer 11

Here's my PHP log function:
If you want to edit the log rows $maxLogs=5,
or the order to write your logs $logOrder='top'
<?php
##### Start Script
lg('Script start','start');
#Code......
lg('Script end','end');
function lg($str,$mod='Your Log Category'){
$ts = microtime(true);
if(!defined('logTimer')){
define('logTimer',microtime(true));
}
$diff=abs(round(($ts-logTimer)*1000,2));
$maxLogs=5;
$logOrder='top';#new Logs at top
$filename = './log.txt';
$log=[];
if(!file_exists($filename)){
if(!file_put_contents($filename,json_encode($log,128))){
echo "Can’t open to write '$filename' Check Permissions";
return;
}
}else{
$c=file_get_contents($filename);
if(trim($c)==''){$c='[]';}
$log =#json_decode($c,true);
if(!is_Array($log)){$log=[];}
}
$new=['mod'=>$mod,'date'=> date('Y-m-d H:i:s')." Scripttime: ".$diff."ms",'log'=>$str];
if($logOrder=='top'){
array_unshift($log , $new);
$log=array_slice($log,0,$maxLogs);
}else{
$log[]=$new;
$log=array_slice($log,0-$maxLogs,$maxLogs);
}
$logs=json_encode($log,128);
if(!file_put_contents($filename,$logs) ){echo ("Can’t open to write '$filename' Check Permissions") ;return;}
return $str;
}
?>
The Output looks like:
[
{
"mod": "delete",
"date": "2022-08-04 13:48:02 0.33ms",
"log": "test 2"
},
{
"mod": "start",
"date": "2022-08-04 13:48:29 0ms",
"log": "test"
},
{
"mod": "delete",
"date": "2022-08-04 13:48:29 0.27ms",
"log": "test 2"
}
]