Dzherzinsky

alright, so having the 3 arguments and sending them to an array does not work like when you assign the items to an array like $my_array = array(1, 2, 3); I thought that it would have been the same, gosh, sorry for so much inconvenience. I promise to watch more the forum and ask less. I have learned a lot from you best regards

Hello I just copied and pasted what you wrote, here is a full copy of paste of the files in question. I agree with you that your code made perfect sense, so I dont know where I am screwing up <?php class Motorbike extends Vehicle { protected $bikes_speed = array(); /*public function speed ($d1, $d2, $d3) { // the 'this' keyword denotes that the variable $bikes_speed belongs to the current object $this->bikes_speed[] = $d1/10; $this->bikes_speed[] = $d2/10; $this->bikes_speed[] = $d3/10; return $this->bikes_speed; }*/ public function speed($speeds) { foreach($speeds as $speed) { $this->bikes_speed[] = $speed/10; } return $this->bikes_speed; } } ?> and this is the other file <?php require_once 'vehicle.php'; require_once 'Motorbike.php'; $v1 = 50; $v2 = 20; $v3 = 600; $suzuki = new Motorbike(); $speeds = $suzuki->speed($v1, $v2, $v3); echo "Speeds are: "; foreach($speeds as $speed) { echo $speed . "<br />"; } ?>

Hello the first version you wrote works. But, have you tested the second, the one that has the speed method accepting the array ? I get Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\code\Motorbike.php on line 21 and that line corresponds to foreach($speeds as $speed) which is baffling to me because your code does seem completely correct here too

I made a donation to PHPfreaks, thanks for your help and patience

thank you a lot I completed the book of PHP long ago, but the problem is that whatever I learn last week, I cant remember it today (age) and as per the simplification of the method accepting an array, that was pretty much the first question I asked right at the beginning of the thread if a constructor (at the time) could have an array as argument as I was sending several arguments at the instantiaton moment creating an object, but while I do forget what my name is or what I had for breakfast, I realized I came across a very common issue which is returning several values from a function (which cant be) and how to work around it with array and also calling from different objects and files. Believe it or not, I coded entirely www.matchandtravel.net and if you look at it it does have some nice JQUERY stuff and AJAX thanks a lot. I will do my best to get this coding that you did (it works, I tried it) into my head and keep it in. best regards

Hello well I am going nuts trying to return the full array of values for printing when I call the function from another file. Here is one file: <?php class Motorbike extends Vehicle { protected $bikes_speed = array(); public function speed ($d1, $d2, $d3){ $bikes_speed[] = $v1 = $d1/10; $bikes_speed[] = $v2 = $d2/10; $bikes_speed[] = $v3 = $d3/10; return $bikes_speed(); // Fatal error: Function name must be a string in C:\xampp\htdocs\code\Motorbike.php on line 14 } // METHOD TO REPORT TABLE OF ACCELERATION public function acceleration() { echo "not defined yet"; } } ?> and here is the calling object and function from the other file <?php require_once 'vehicle.php'; require_once 'Motorbike.php'; $v1 = 50; $v2 = 20; $v3 = 600; $suzuky_hayabusha = new Motorbike(); $suzuky_hayabusha->speed($v1, $v2, $v3); echo '<p>The speeds are ' . $suzuky_hayabusha->speed($v1, $v2, $v3) . '</p>'; foreach ($bikes_speed as $value){ echo $value; } ?>

I mean, on page 302 of the book PHP 5 advanced by Larry Ullman there is a code snippet which goes like this, and the attributes are declared outside the functions and are used within the functions. That is what the $this is for That code snippet reads class Triangle extends Shape { private $sides = array (); private $perimeter = NULL; then comes the constructor finishes the constructor and then there is a method like this public function get_perimeter () { return $this->perimeter; } So, I am not using that attribute in any way different that is used in the book. I d rather say that variables declared within a function, yes, are local to it and do die after the function finishes, but attributes declared outside functions can be used by these, in fact, that is how everything goes, you declare the variables, you declare the construct and then you declare the functions. I am a newbie so I am not in the least pretending to argue, I was just believing it was like this. Anyway, I ll return to the book again. thanks

Hi well let's see 1)Your code doesn't make allot of sense. Your __construct expects a single argument, you pass it 3. but this is what I have been talking about all the time, if $distance is an array, then I can pass it several parameters, at least that is what I thought, that is why it is an array for. 2) From there, you don't actually use any of the arguments within the __construct. Your acceleration() method then goes on to try and echo a variable ($distance) which has not been defined a) I mean, you dont need to predefine variables in php, you can use them on the fly, cant you ? b) and also tries to access indexes within the $this->speed array which don't appear to have been set anywhere within any code you have posted. Where not ? this is what I was trying to achieve precisely, to set the variable through the loop of the array which is the parameter of the construct $this->speed[$i] = ($this->distance[$i])/($i*10); So, as you can see it makes sense what I tried. Another completely different thing is that the syntax is incorrect and the assumptions of how the code should work can be incorrect, but there were not random pieces here and there

yes, that is what I asummed and that is why I went straight to do that. In the code snippet I am just doing that, but the return I get is 0. this is the object calling from another file $v1 = 10; $v2 = 20; $v3 = 40; $object = new Motorbike($v1, $v2, $v3); echo '<p>The speeds are ' . $object->acceleration() . '</p>'; and well, I just reduced it to the minimum for testing purposes here is the full code of both the construct and one method. I call to that method with the object class Motorbike extends Vehicle { private $wheels, $price, $builtyear, $seats; private $distance = array(); private $speed = array(); function __construct($distance) { for($i = 1; $i<=3;$i++ ){ $this->speed[$i] = ($this->distance[$i])/($i*10); // this gets the distances sent by the object, divides them by different time points gets the speed } } // METHOD TO REPORT TABLE OF ACCELERATION public function acceleration() { $devuelve = array(); echo count($distance); return $this->devuelve = ($this->speed[2] - $this->speed[1])/5; // and the acceleration (if constant) is difference of speed at different time points // of course, I want for all array elements, I just chose one pair above for testing } }

Hello again but, you are placing all the variables one after one in the parentheses of the constructor. One of my questions was to put instead an array as a parameter of the constructor. You wrote this one public function __construct( $a,$b,$c ) { $this->speed[] = $a; $this->speed[] = $b; $this->speed[] = $c; the question is if I could do something like this, but it aint working function __construct($distance) { // where $distance is an array that will get in a lot all the params sent by the object in another file for($i = 1; $i<=3;$i++ ){ // here below I send distances made every 10 seconds. That will give me the speed at that point $this->speed[$i] = ($this->distance[$i])/($i*10); } } and below this code, I would get the acceleration out of the speed differences per time moment

Thank you, I ll take it from there. Interesting was to see how you managed to return several results, you just created an array and hauled all the data there, and then returned the array instead of a single scalar variable (why didnt I think about that ?) regards

Hello I am on to OOP now and I dont know how to write the syntax to print the results I want The scenario is I have the abstract class, its subclass and then the object that calls the subclass, all in different files. So: part of the subclass reads: function __construct($v1, $v2, $v3) { $this->speed[] = $v1; // I dont like this either, it is not elegant. I tried to put an array as argument of the constructor and send the parameters $this->speed[] = $v2; // from the object being created, but it did not work, so I leave it like this for now, but I would have preferred to put that $this->speed[] = $v3; // array and then populate it by some looping. } // METHOD TO REPORT TABLE OF ACCELERATION public function acceleration() { return $this->acceleration1 = ($this->speed[1] - $this->speed[0])/5; // I actually need to return the other two speed differences from the other stages, but as you know, once the first return acts, it exits the function // so sure this "return" has to be abandoned and the results of the function have to be printed otherwise. That is the question. } =================================== And now from the Object file I am trying to call the function, but of course, I only get one value, even if I write 3 times return $objeto = new Motorbike($v1, $v2, $v3); echo '<p>The speeds are ' . $objeto->acceleration() . '</p>'; // Yes, this call works, of course, but that is about it. I cant print any other result. Thanks a lot

@Adam Thank you very much! it worked and thanks for the tip about being numeric, I have no problem in turning $user to $user_id so that is numeric. That code snippet is part of an AJAX code. I was forced to do a weird thing like this because in my System the only way to get the user_id was through the built in PHP function get_userID() of my system (a social network) and then I would be inserting that data into the JS. Naturally I would have written 'this.value' if I were getting the IDs, say from a Select box but it had to locate the user_id, thanks God (and to you!) it worked, I was beginning to dread that my idea risking client server with client side languages would hate to talk to each other, but it did the trick Best regards

Hello everybody There is one word here that I dont get to include the right way, I think because of the issue of single and double quotes. When I replace the variable by its value, it works me alright, but since I have to include this PHP variable ($user) within the onclick JS function, it is problematic. <?php echo ' <form> <input type="checkbox" name="asset" value="" onclick="getLoggedInUser($user) " /> I am potentially interested in this product service<br /> <div id="txtHint"><b>Note:</b></div> </form> '; By the way, I cant believe the verification code to submit the text. It took me 2 minutes to figure out what they were talking about John, George, Paul, and I had no idea what the hell that was, when I casually thought of the Beatles. so Ringo. I hate that rubbish music. Next time I get verification code like that I go elsewhere.