PHP - Use Callback Function In Other Class

Mon Aug 24, 2020 2:41 pm

I'm using php_serial.class.php, called once

require_once("php_serial.class.php");

and call it $serial:

$serial = new phpSerial;

The above are in a global.php file that sets up the serial com parameters.

In another file, I include global.php that contains my other code to send and read from the class

In a function, I pass the class:

Function checkInput($serial){

And one in the Function:

$read = $serial->readPort();

This throws an error: "PHP Fatal error: Uncaught Error: Call to a member function readPort() on string"

If I do the $read outside of the Function, it doesn't throw the error so I assume I'm doing something wrong passing the class to the function?

Code: [Select]
class replayer extends users {
--SNIP--
public $islive = false;
--SNIP--
     function chat($id, $nick, $chat) {
          --SNIP--
          <-----------
     }
}
There's my code, I want to take the variable $islive from the above class and use it in the chat() function.

How would I do it? I've tried making it a global inside of the chat() function.

Hi,

I am using a separate class for all the functions. And using using the following function "objectToArray" to convert the JSON decoded object to Array.

Class file:
       

               class xyz
              {
                    . 
                    .
                    .
                    .
                    .

                    function objectToArray($d) {
         if (is_object($d)) {
       $d = get_object_vars($d);
                  }
         if (is_array($d)) {
     return array_map(__FUNCTION__, $d);
         }
         else {
     return $d;
         }
          }
                    .
                    .
                    .

          }
      


Main page:

          $obj = new xyz();

          $arr = $obj->objectToArray($json_obj);



Because the function "objectToArray" is recursive, array_map(__FUNCTION__, $d) is not able to applies the callback. And throws the warning "array_map() expects parameter 1 to be a valid callback".

Need help!

Girish

can someone help me I am trying to call a class function using a varible.... example
say i go to index.php?page=contact i want to pull that class with out doing a switch statement can someone help me
Code: [Select]
<?php
$Site = page;
$Site->getPage($_GET['page']);
?>
Code: [Select]
<?php
class page extends site {

function getPage($page) {
return $this->$page;
}
function Contact() {
echo '<h2>Contact test</h2>';
echo '<form>

</form>';
}

}
?>

<?php
class CsvToArray {
/*
	global $file;
	$file = '../Datafeeds/baseball_all.csv';
*/

public function data() {
$file = '../Datafeeds/baseball_all.csv';
$fileName = fopen($file,'r+');
$all_rows = array();
$header = fgetcsv($fileName);
while ($row = fgetcsv($fileName)) {
$games[] = array_combine($header, $row);
  
}
//print_r($games);
print_r($games[64]["Home Team"]);
}
}

$game = new CsvToArray();
$game->data();
?>

csv: https://anonymousfiles.io/vSubWgPY/

How can I get specific array values outside a class or function? About to try "File put contents" I think. That should work right? So I thought the last couple times. Or what would you suggest?. Overwritten previous attempts to share =[

 

Next up is seeing if I can change $file to $var to change it from other locations. Should be easy I reckon.

Edited April 19 by Minzer

Hi I'm setting up my own framework for a project. I was coming to the point of completion and thought up of a new idea.

Is it possible to call a function like this from a class:


class myClass {

    function func($param)
    {
        echo "Hello world". $param;
    }

}

$class = 'myClass';
$func = "func(' It\'s time to partey!')";

$$class = new $class;
$$class->$func;


Thanks for any help!

I have 2 php files. I am unable to get B's global variable from A's static method:

A.php
Code: [Select]
class c_A
  { public static function f_A()
      { include_once( "B.php" ) ;
        print f_B() ;
      }
  }
c_A::f_A( ); // only prints "B : "

B.php
Code: [Select]
$gvs = "global variable from B" ;

function f_B()
  { return "B : " . $GLOBALS[ "gvs" ] ;
  }


any thoughts?


thanks,
Shannon

Hi there people of the PHP forum,

This functions intention is to output the same code 4 digit code twice before generating a new one, I can get it to do one fine, but I cannot for the life of me figure out how to get it to repeat twice before changing on the third call.
 
private function KeyGen(){

$Numerical  = range(0,9);
$Alpha = range("A","Z");

$Keys = array_merge($Numerical, $Alpha);
return $Keys[rand(0,35)].$Keys[rand(0,35)].$Keys[rand(0,35)].$Keys[rand(0,35)];
}

I am needing it to do this so that each 'set' of 2 calls to the function (within the class) gives the same 4 digit code.  At the moment I am just making one call & then assigning that single call to a variable and then referencing that var twice, this is not what I want to do, but it scratches the itch for now...

Any idea's/other logic would be greatly appreciated.

Cheers,
Rw

Hello,   I am having some troubles and was hoping someone could guide me through it.   Q: When ever I try call my get_status function all I get is a white page of nothing, no errors to work from etc... Can anyone here see what I am doing wrong?     PATH: index.php   NOTICE //<<-- KILLS PAGE

<?php
spl_autoload_register(function ($class) {
    include '/lib/' . $class . '.inc';
});

$servers = new servers;
echo $servers->get_servers(); 
echo "STATUS: ".$servers->get_status("0.0.0.0",80); //<<-- KILLS PAGE
?>

Page works fine until I want to use the status function, I get no errors or anything just a blank page.   PATH: Lib/Servers.inc   NOTICE //<<-- KILLS PAGE

<?php
ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(E_ALL);
error_reporting(-1);

	include_once '../../Global-Includes/ServerStatus/db-connect.php';
	
//namespace xStatus;

class servers {

	private $db_Hostname	= HOSTNAME;
	private $db_Username	= USERNAME;
	private $db_Password	= PASSWORD;
	private $db_Database	= DATABASE;
	
	private $dbSQL			= '';
 
    function __construct() {
		
	} // End Construct
	
		public function get_servers(){
			
			$db = new mysqli($this->db_Hostname,$this->db_Username,$this->db_Password,$this->db_Database); 
		
				$message = '';

				// list current servers from database
				$sql = "SELECT * FROM tbl_servers";
				$res = $db->query($sql);
				
				if ($res->num_rows > 0) {
					
					$message = '<h3>Current Servers</h3>';
					
					while ($row = $res->fetch_assoc()) {
						
						$message .= $row['HostGame'] . '<br>';
						$message .= $row['HostIP'] . '<br>';
						$message .= $row['HostPort'] . '<br>';
						$message .= $this->get_status($row['HostIP'],$row['HostPort']) . '<br>'; //<<-- KILLS PAGE!
						
					}
				}
				
				$message .= "<br>End of the \"Server List\" ";
				
			return $message;
			
			}
		
	
		public function get_status(&$ServerIP,&$ServerPort){
			
			if(@stream_socket_client("tcp://".$this.$ServerIP.":".$this.$ServerPort."", $errno, $errstr, 1) !== false) {
				return "Online";
			} else {
				return "Offline";
			}
			return "Offline";
			}
	
} // End class

?>

Kind regards and thank you.        

This topic has been moved to JavaScript Help.

http://www.phpfreaks.com/forums/index.php?topic=351058.0

Hi

I am in the process of converting to Object Oriented from Procedural. To cater for this I have built an admin_login function, contained within a class: 'siteFunctions'.

However, I am having trouble pointing the admin form to the function correctly.

Every time I click 'submit', the form does not process anything. It doesn't even 'think' about it i.e. show the egg timer....

I have built this script heaps of times using the procedural method, so I guess I am somehow doing something wrong with respect to referencing the action attribute of the form (due to my new approach).

I am very new to OO so please go easy on me: I know the script isn't particularly advanced. I just want to get used to putting functions into classes, and then calling the code, before I move onto more advanced stuff.

I have placed all of the files within the same folder in order to rule out driectory path issues.

Here are the three scripts that I think are relevant (login, functionsClass, and the mysql connection script):

Login

 
$pageTitle = "Admin Login";
include("admin_header.php");
include_once("sitefunctions.php");
new siteFunctions();
echo '<div class="admin_main_body">';   


       <form action="<?php echo htmlentities($_SERVER["PHP_SELF"]);?>" method='post'>
       <input type="text" name="username" id="username" size="20">
       <label>Username</label><br />
       <input type="password" name="password" id="password" size="20">
       <label>Password</label><br />
       <input type="submit" name="submit" id="submit" value="submit">
       </form>

echo '<div>';
include("includes/admin_footer.php");


sitefunctions.php

 
 //$page = "admin_index.php";
 class siteFunctions {
     var $message;
     function admin_login() {
 echo '<div class="admin_main_body">';
 $message = NULL;
 if (isset($_POST['submit'])) {
     require_once ("mysql_connect.php"); 
 if (empty($_POST['username'])) {
 $u = FALSE;
 $message .= '<p> Please enter your username </p>';
} else {
$u = escape_data($_POST['username']);
}
if (empty($_POST['password'])) {
$p = FALSE;
$message .= '<p>You forgot to enter your password </p>';
} else {
$p = escape_data($_POST['password']);
     }

if ($u && $p) { // If everything's OK.
$query = "SELECT * FROM admin WHERE username= ('$u') AND password=('$p')";
$result = @mysqli_query($GLOBALS["___mysqli_ston"], $query);
$row = mysqli_fetch_array($result,  MYSQLI_BOTH); 
if ($row) { 
session_start();
$_SESSION["admin_id"] = $row[0];
//header("$page"); //Redirects user to admin_index.php
//header('location: "$page"');
header ("Location:  http://" . $_SERVER['HTTP_HOST'] . dirname($_SERVER['PHP_SELF']) . "admin_index.php");  

//echo '$_SESSION["admin_id"]';
}
else {
$message = '<p> The username and password combination are incorrect.</p>'; 
}
((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
} else {
$message .= '<p>Please try again.</p>';
}
}
if (isset($message)) {
echo '<font color="red">', $message, '</font>';
}
//$adminLogin = 'admin_login';
} //Closes function
} //Closes class


Connection Script

 
// This file contains the database access information. This file also establishes a connection to MySQL and selects the database.

// Set the database access information as constants.
DEFINE ('DB_USER', 'atkinson');
DEFINE ('DB_PASSWORD', 'XYZ111WA');
DEFINE ('DB_HOST', 'localhost');
DEFINE ('DB_NAME', 'practicesite');

if ($dbc = @($GLOBALS["___mysqli_ston"] = mysqli_connect(DB_HOST,  DB_USER,  DB_PASSWORD))) { // Make the connnection.

if (!((bool)mysqli_query($GLOBALS["___mysqli_ston"], "USE " . constant('DB_NAME')))) { // If it can't select the database.

// Handle the error.
my_error_handler (((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_errno($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_errno()) ? $___mysqli_res : false)), 'Could not select the database: ' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)));

// Print a message to the user, include the footer, and kill the script.
echo '<p><font color="red">The site is currently experiencing technical difficulties. We apologize for any inconvenience.</font></p>';
include_once ('includes/footer.php');
exit();

} // End of mysql_select_db IF.

} else { // If it couldn't connect to MySQL.

// Print a message to the user, include the footer, and kill the script.
my_error_handler (((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_errno($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_errno()) ? $___mysqli_res : false)), 'Could not connect to the database: ' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)));
echo '<p><font color="red">The site is currently experiencing technical difficulties. We apologize for any inconvenience.</font></p>';
include_once ('includes/footer.php');
exit();

} // End of $dbc IF.

// Function for escaping and trimming form data.
function escape_data ($data) { 
global $dbc;
if (ini_get('magic_quotes_gpc')) {
$data = stripslashes($data);
}
return mysqli_real_escape_string( $dbc, trim ($data));
} // End of escape_data() function.


Any help would be appreciated.
 

Cheers

Will

Imagine 6 PHP classes (one each for a product line), that have very similar coding structures, that go like this:

//function that computes stuff inside each of 6 files:
//they vary slightly from file to file but essentially it is this:
function computeFunction
{
    $this->x = new X();

    $this->x->calcD();

    if ($this->x->dOk)
    {
        $this->x->calcE();
        $this->x->calcN();   
    }

    //more complicated logic that is essentially like above

    //and by the way!
    print $this->x->someVarThatIsUsedLater;
}

Then there is a single class like so :

class X
{
    function calcD()
    {
        //compute some condition

        if (<computed condition is met>) $this->dOk = true;
        else $this->dOk = false;

        //and by the way
        $this->someVarThatIsUsedLater = 4;
    }
}

Just to bring your attention to it, none of these functions return any result or value, but they nevertheless operate on variables of key interest via side-effects.  That is, they modify variables that essentially act like globals, and then use those variables later ($this->dOk and $this->someVarThatIsUsedLater are one more prominent examples).   I need to untangle this mess.  And make it clean and clear again, and make sense.  How do I best proceed?   I have been wrestling with some ideas... like $this->dOk, can within reason be turned into a return variable of calcD() function, and then be tested against like if ($this->x->calcD()) and I think it will be reasonable enough.  But then there are other functions that don't return anything and just act on variables via side-effects anyway so $this->dOk is one of the lesser troubles...   Other than that, what I am thinking of doing is getting rid of these mini-functions (calcE(),  calcN(), etc.), removing them as a funciton, and putting their body directly into the code, as a first step to refactor.  Many of the computations done inside are just a few lines of code anyway, and the functions kind of hide a lot of side-effects that happen, instead of actually encapsulating the behavior.  So while it may be counter-intuitive to dismantle the functions that appear to be doing something that normally can be encapsulated (computing key variables E, N, etc), I think dismantling them will actually clean things up as far as collecting all the side-effects inside a single parent function thereby making them more visible.   Caveat:  while doing so I will end up with 6 copies of untangled dismantled functions, because dismantling class X and putting its content into each of the 6 product line classes will have that effect.   But my hope is that from that point I will see more clearly to start identifying places where I can start to truly encapsulating the behavior via various structures, instead of masking it.   Problems / Questions: I would like to but I am not entirely sure that I can skip that step of dismantling functions & the 6x multiplying effect. It's probably the same like skipping steps in solving polynomial equations.  Some can do it and some need to list each step of their work. And I am not entirely sure what structures I can replace it with in the end after I dismantle the functions. It also looks like a lot of work.  Is there a better way? P.S. I already put tests on computeFunction() for each product line so I can be less paranoid about hacking stuff up.
Edited by dennis-fedco, 19 January 2015 - 03:06 PM.

I've added a CSS class to the main menu of a Wordpress site and wish to remove the class if the browser width drops below a certain number. I've tried a number of different approaches but none has worked.    Some examples:   $(document).ready(function() {

Hello, I'm developing a script that includes an admincp. I want to know if anyone knows how to make it so when the administrator goes to the update section of the admin cp, it checks the scripts current version and displays the latest version released, then they have an option to install the latest version, using php to release the files needed with a list of files on the update server.

Is there any possible way to do this?

Hey All,

I am looking for a way to setup licensing for a script i built,  I am not to worried about the script being modified because I will have different tutorials on modifying things within the script, but I would like to restrict the use of the script to a Per Domain basis.

I am looking for some resources or a foot in the right direction to achieve this.

Basically, I am looking to setup an authentication code linked to a domain name.  The user uploads the script, adds user/pass/authentication code. Are callbacks a way for me to setup a database with this info, and if the code doesn't match the domain it's not usable?  perhaps by including an important file or command...

thanks in advance for any info.