PHP - Strange Issue (arrays And Classes)

I've been spending long hours learning about classes and their magic methods. I just came across a tutorial which showed a constructor like this:

class Device {
    //...
    public function  __construct(Battery $battery, $name) {
        // $battery can only be a valid Battery object
        $this->battery = $battery;
        $this->name = $name;
        // connect to the network
        $this->connect();
    }
    //...
}

the Battery part instantly caught my attention. Here had previously made a Battery class (and a more complete Device class) but the next thing he did really caught my interest:

$device = new Device(new Battery(), 'iMagic');
// iMagic connected
echo $device->name;
// iMagic

what the hell is going on here? Is this another way to include the methods and properties of one class into another class, in order words is this the same thing as:

class Device extends Battery

I don't think so because this new Battery() thing looks more like its creating an object inside the Device object. Previously the only way I could to that was to type $battery = new Battery() inside one of my methods. But this looks like hes doing something different. Can anyone explain whats going on here?   The whole tutorial is he http://code.tutsplus...-php--net-13085 in the main Device method he has a premade $battery variable to hold the Battery object. Sometimes I have multiple classes containing functions which I'd like to include in my main class. I can only extend one class, so I usually extent a class containing only properties, no methods. I still don't know what difference making that info class abstract is, I'd appreciate if anyone could tell me.   Also I'd love to know what the point in static methods is. I've never used them because I've never seen the point. Is it just to make it easier to call the methods because you don't need to create an object instance to call them? Sorry for the extra questions, the first one is what I'm really wondering about.    

Hey

I wonder if you could help me.
I have a script that scans a given webpage for the pagination numbers.

Firstly I scan the page and load all the page numbers into $info['page'] as an array.

I then setup a foreach loop, to go through each element (page number in the array).

So the result is like:
Code: [Select]
Array
(
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
)

Element 1 is page 2 etc.

In the foreach loop I get it to scan page 2 of the webpage and return the page numbers. I am careful to not add a page number to the array if it already exists, and I also have another array that holds all the page numbers that has been scanned. I have this working fine.

The problem I have, is that it is only looping up to page 10, despite the $info['page'] array having Code: [Select]
( [9] => 10 [10] => 11 [11] => 12 [12] => 13 ) left in it.
Why is this?

Any help would be appreciated.

Let me explain my problem. I have an array with dates and numbers in format ($cronograma)

Ex:

Array ( [2020-09-21] => Array ( [0] => 2020-09-21 [1] => 2 [2] => 2 [3] => 2 ) [2020-09-28] => Array ( [0] => 2020-09-28 [1] => 2 [2] => 2 [3] => 4 )

Then i have another array with 2 ids (in this case 58,60) ($id)

Finally i have a third array with numbers only (in this case 34,34) $tot

So what i want is cross information beween them, for example for id 58 I must get dates (first element and last element when $tot = 34) for id 60 I must get dates (first element after $tot =34 and last element of array)

Whath i have so far is this

foreach ($id as $idPlan) { foreach ($cronograma as $c) { $t1 = 0; foreach ($tot as $d) { $t1 += (int)$d['tempos']; if ($c[3] == $t1) { $newAr[] =$idPlan; $newAr[] = $c[0]; } } } }

My response

array(8) { [0]=> string(2) "58" [1]=> string(10) "2021-02-01" [2]=> string(2) "58" [3]=> string(10) "2021-06-14" [4]=> string(2) "60" [5]=> string(10) "2021-02-01" [6]=> string(2) "60" [7]=> string(10) "2021-06-14" } null

So it's clear that i have all repeated

I should have a line like:

58 - 2020-09-21 -2021-02-01

Any help?

Not sure how to describe what I'm trying to do here in the title, but here goes with what I am trying to accomplish.

I've got a few hundred lines of code in total so far, so I'll try to keep it as short as I can. I've got an application that I am programming using classes for each module and right now I am coding the base classes that I need in order for it to run (database, errors, logging, etc). What I'm doing for my database class is I have a query factory and it extends the MySQLi class so I can process, clean and code the rest of my app faster. I also have another, unrelated class "Error", which will be used for processing errors I might come across.

I'd rather do it this way instead of having to call trigger_error and error_log every time there is an error. I'd also not like to have to call a new instance of an object every time I need to use something from that class. Is there any way I can call a class within a class and return it as an object for all the methods within the class?

I've tried the methods below, but no luck I've tried others, but I'm trying to keep it brief and get what I'm trying to do across.

<?php

class QueryFactory extends MySQLi {

public  $err = new error(); //Doesn't work.
public  $err = error(); //Nope.

#This is the function that I need the $err object for.
function set($fields, $newvals) {

if ( is_array($fields) && is_array($newvals) ) {

if ( count($fields) != count($newvals) ) {
//Instead of below, I want to do something like $err->('Array lengths must match for method', 256, $islogged = 1);
                              trigger_error('Array lengths must match for method', 256);
}

}
}

}


The thing is, I have a "run.inc.php" which does include and create new objects for running just the basic app and if I try to redeclare the error class in query.class.php, it gives me an error saying I can't do that, but if i try to call $err from the page that has all the classes defined it throws an error saying that my method is undeclared. I'd like my error class be available to every other class I create so I can display and log errors as needed. Any suggestions or links to point me where I'd like to go?

I'm having troubling with trying to create a function to spit out a single array with the following array. I can write it in a away that looks through the arrays manually. 

the results i am trying to generate is that each item in generated array.

Array to convert

array(
    "account" => array(
        "login",
        "register",
        "logout",
        "edit",
    ),
    "p" => array( 
        "report",
    ),
    "array1.0" => array( 
        "array2.0" => array(
            "array3.0",
            "array3.1
        ),
        "array2.1",
    ),

generating the array will look like this

 

Array ( 
[0] => account 
[1] => account/login 
[2] => account/register 
[3] => account/logout 
[4] => account/edit 
[5] => p 
[6] => p/report 
[7] => array1.0 
[8] => array1.0/array2.0
[9] => array1.0/array2.0/array3.0
[10] => array1.0/array2.0/array3.1
[11] => array1.0/array2.1

)

The idea is that id generates a single array with combined labels and arrays inside, etc. I just can't figure out how to create a script that will create this array even If I add a new value or array. 

 

I have this thing that i am trying to make but i cant get it to work.. can anyone help?

Code: [Select]
function sql_read( $dbname,$dbusername,$dbpassword )
{
$names = array();
$password = array();


$connect = @mysql_connect("mysql11.000webhost.com",$dbusername,$dbpassword) or die("Could Not Connect");
@mysql_select_db ($dbname) or die("Could not find DataBase");


$query = mysql_query("select * from users");
$numrows = mysql_num_rows($query);

if ($numrows > 0){

while($row = mysql_fetch_assoc($query)){

$names[] = $row["uname"];
$password[] = $row["password"];
$id = $row["id"];

}
$return = array($names,$password,$id);

}else{
$return = array();
}


return $return[];
}



$names = array();

$names = sql_read("XXXXXX","XXXXXX","XXXXXXX")[0];


The error i get is
Code: [Select]
Parse error: syntax error, unexpected '[' in /home/a5480952/public_html/sql/index.php on line 28
Line 28 is "$names = sql_read("XXXXXX","XXXXXX","XXXXXXX")[0];"

Please help... i REALLLLD need help with this.. ask questions if you want to know more about what i am trying to do... thanks!

I have two arrays, both with the same key values. I'd like to combine them. So for instance...

Code: [Select]
<?php
$array1['abcd'] = array( 'value1' => "blah", 'value2' => "blahblah");
$array1['efgh'] = array( 'value1' => "ha", 'value2' => "haha", 'valuex' => "xyz");

$array2['abcd'] = array('value3' => "three", 'value4' => "four");
$array2['efgh'] = array( 'value3' => "hohoho", 'value6' => "six6");

function combine_arrays($array1,$array2)
{

//*combining*
return $single_array;
}

echo "<pre>";
print_r(combine_arrays($array1,$array2));
echo "</pre>";

/*
would produce 

['abcd'] = ( 'value1'  => "blah",
                 'value2'  => "blahblah",
                 'value3'  => "three",
                 'value4'  => "four" )

['efgh'] = ( 'value1' => "ha",
                 'value2' => "haha",
                'valuex'  => "xyz",
                'value3' => "hohoho",
                'value6' => "six6" )
*/
?>
What's the easiest way to do this?

Hi.

I want to know how I access calsses in PHP. I mean how I search for class that I want and need. do I need to search in php.net? and what editors that provide access the the whole php classes and who they keep updated?

Cheers.

Hi, I want to build a simple calculator class and one of the function is to calculate the factorial, but for some reason I cannot get this to work.

Here is class:
=========
Code: [Select]
<?php
class Calculator {

 function factorial($n) {
  if($n==1)
return 1;
  else 
return factorial($n-1)*$n;
 }
}//END CLASS Calculator

$calculator=new Calculator();
print $calculator->factorial(3);
?> 

But it doesn't work, I know this is simple but I am a little rusty with object oriented programming.

I'd appreciated any help!

Hi there,    This might a newbie question but I need help understanding PHP classes which am currently learning.    I have an index page.    With this three included files.    database.php config.php account.php    on database.php, the class is declared using $connection new Database(...), on this page is also all the coding for this class.   In config.php is a declared class of $account new Account($user_id);   and on account.php is all the details for the account class.    on the index.php is echo $account->sayHello;    However, My page is throwing out an error because I'm trying to use $connection->query(..) in my account.php / Account class.    I have tried to extend the Account class with Database but still have no luck.    How can I make sure the I can use a class function from another page in my Account class?        Thanks for reading

Take the following example:


<?php
class a {
var $things;
public function __construct($stuff) {
$this->things = $stuff;
}
}
class b {
var $morethings;
$this->morethings = "something";
}

$c = new a(new b);

echo $c->things->__PARENT__;
?>


The line "echo $c->things->__PARENT__;" (as you can probably imagine) does not work. How would I output what the 'b' object is stored in ('a')?

I have just start using PHP classes and was wondering how you continue an instance of a class in another file.  For example I have a folder called "includes" where I includes files that I send data to when I perform ajax request.  However how do I continue an instance of class in these files?  Hope that makes sense. 

Thanks for any help. 

If I have defined an instance of a class in one script how do I then use this same instance and the same variable in other scripts?  For example say I have this code in a file called "index.php"


include("myclass.class.php");

$myclass = new myClass;

$myclass->$variable = "hello world";


However if I then have this code in a file called "page1.php" when I try to access the same variable it is empty. 


include("myclass.class.php");

echo($myclass->$variable)


How can I use the same instance of this class across all files keep the variable values the same?

Thanks for any help. 

Hello,

maybe back to basics, but

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