PHP save Class in other File and call it from another class - php

Question

Im just tryed to work in PHP how in java, and I got a Problem with save Objects in other php File.
In java will looks like this:
package xxxx
public class Data {
public static Writer writer = null;
}
To save class there?
Data.writer = new Writer(file);
To get it from other Class or use it?
Data.writer.setLine("blablabla");
But when I tryed do the same in PHP there comes Problem then the objects will be not saved in the other file.
My Codes:
ClassErrorLogWriter.php
class ErrorLog {
private $logfile = null;
private $writer = null;
public function __construct($file){
if(file_exists($file)){
$this->logfile = $file;
}else{
$this->logfile = $file;
$this->writer = fopen($this->logfile, "a") or die("Unable to open file! ".$this->logfile);
fwrite($this->writer, "New file was createt\n");
fclose($this->writer);
}
$this->loadWriter();
}
private function loadWriter(){
$this->writer = fopen($this->logfile, "a");
}
public function write($text){
$date = $this->getDataFormat();
fwrite($this->writer, $date.": ".$text."\n");
}
public function writeError($text){
$date = $this->getDataFormat();
fwrite($this->writer, $date.": ERROR: ".$text."\n");
}
private function getDataFormat(){
$date = "".date("d-m-Y_H:i:s A")."";
return $date;
}
public function close(){
fclose($this->writer);
}
}
data.php
$AuctualyPath = null;
$CurrentSqlConnection = null;
$CurrentLogWriter = null;
$DefaultPageFile = "defaultPage/defaultPage.php";
staticFunctions.php
function createFile($file){
$writer = fopen($file, "w");
fclose($writer);
}
function checkFiles(){
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt"); <- Error Here, $CurrentLogWriter is NULL
}
}
Application File (Start) must be called a specific function startSite()
function startSite(){
include "datas/php/ClassErrorLogWriter.php";
include "datas/php/data.php";
include "staticFunctions.php";
echo $DefaultPageFile;
$CurrentLogWriter = new ErrorLog(__DIR__."/logs/logFile.log");
$CurrentLogWriter->writer("test");
checkFiles();
}
After I Included Files I checked first if Data.php Variables are valid with printing $DefaultPageFile, then I defined new Logwriter in the Variable $CurrentLogWriter from Data File tryed to write it (it works). After I called Function from other php Class checkFiles() from staticFunctions.php. in the function checkFiles() by writing the Log It returns me Error then $CurrentLogWriter is NULL.
When I define Data.php as static Class so I must always define this Class and saving from date will not work. Can you help me by this Problem?

Answer 1

The w3school documentation for PHP Variables clearly states:
A variable declared outside a function has a GLOBAL SCOPE and can only be accessed outside a function
When using the include statement, your included file is simply copied as-is into the current file. Therefore, your startfile() is the same as
function startSite(){
include "datas/php/ClassErrorLogWriter.php";
$AuctualyPath = null;
$CurrentSqlConnection = null;
$CurrentLogWriter = null;
$DefaultPageFile = "defaultPage/defaultPage.php";
function createFile($file){
$writer = fopen($file, "w");
fclose($writer);
}
function checkFiles(){
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt"); // <- Error
// Here, $CurrentLogWriter is NULL
}
}
echo $DefaultPageFile;
$CurrentLogWriter = new ErrorLog(__DIR__."/logs/logFile.log");
$CurrentLogWriter->writer("test");
checkFiles();
}
Notice that your $CurrentLogWriter was initialized outside checkFiles() and can only be used within startSite() which is relatively global to checkFile().
A quick solution to this will be to pass $CurrentLogWriter as a parameter to checkFile() like this:
function checkFiles($CurrentLogWriter){
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt"); <- Error
// Here, $CurrentLogWriter is NULL
}
}
OR
You can optionally passed $CurrentLogWriter as a reference parameter, so that you can reuse it:
function checkFiles(&$CurrentLogWriter){
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt"); <- Error
// Here, $CurrentLogWriter is NULL
}
}
Then, call checkFile() as you did, but this time with the parameter
checkFiles($CurrentLogWriter);

Answer 2

How about a simple file_put_contents ?
file_put_contents manual
it looks also you get messed up with fopen and fclose.
i would just collect all lines for such a class file and pump it out in a whole.
It is simple fast and error prune. If file_put_contens not work i would have a look also at the file write permissions.

Answer 3

i think you were confused in File Management (fopen and fclose).

Answer 4

in the checkFiles() function the $CurrentLogWriter variable is a local variable that is not defined anywhere,
you either have to pass that variable as an argument like
function checkFiles($CurrentLogWriter){
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt");
}
}
or define it as a global like so
function checkFiles(){
global $CurrentLogWriter;
if(!file_exists("config.cfg")){
createFile("config.cfg");
$CurrentLogWriter->write("New File config.cfg was createt");
}
}
and of course also define the global in the function where the vairable is created
function startSite(){
global $CurrentLogWriter;
...
$CurrentLogWriter = new ErrorLog(__DIR__."/logs/logFile.log");
...
}