|
PHP - __call For Properties
__call is used when a method has been called, is there anything similar to __call but for properties?
I wanted to use __get, but that is only for private properties... Similar Tutorialshey guys i have a __call method in my class...the probelm im having is how to get the arguments into this line Code: [Select] return $this->_db->$method($arguments); if arguments where "test1" and "test2" i want the call to do Code: [Select] return $this->_db->$method("test1", "test2"); the code below will put all arguments into one if anyone can help me on how i can seperate please Code: [Select] public function __call($method, $arguments) { if (method_exists($this->_db, $method)) { $arguments = implode(', ', $arguments); return $this->_db->$method($arguments); } } Hi there every one, i'm writing a class that create instances of other classes and I want to use the __call() magic method to make it more compact and dynamic. here is a basic example of what I'm trying to achieve. The code bellow is the working code. Code: [Select] <?php class creator{ private $objects = array(); public function createObj1($param1, $param2, $param3){ $this->objects[]=new Obj1($param1, $param2, $param3); } public function createObj2($param1, $param2){ $this->objects[]=new Obj2($param1, $param2); } } ?> Now I want the same functionality but using just the __call(), something like this Code: [Select] <?php class creator{ private $objects = array(); public function __call($name, $args){ $this->objects[]=new $name($param1, $param2); } } ?> So, the main problem is, in the $args variable i get an array with all the args passed, How can I make the call to create a new object when in the object constructor are individual parameters needed and not an array of parameters. Thank you in advance. In my view file, I instantiate User class and call two methods that have not been declared or initialized in the class: $user = new Models\User(); $user->setFirstName('John'); $user->setLastName('Merlino'); echo $user->getFirstName() . " " . $user->getLastName(); However, I have two private members only available to instances: protected $first_name; protected $last_name; Because I don't want to manually create privileged getters and setters for each of my private members, I use the call method: public function __call($name,$args){ echo $name . "<br />"; echo $args . "<br />"; } Because my methods were not initialized, the interpreter calls the __call method as a last option resort, and passes the name of the method in local variable $name and if exists the arguments passed into the method in local variable $args. Ok so that makes sense. However, when I echo the values of the two variables, I see a blank array created: setFirstName Array setLastName Array getFirstName Array getLastName Array See everytime I call it, there's an array being created. I don't see the purpose of this. Also how often do you use __call() in your php applications, specifically when using MVC? Thanks for response. I am working on a header for a website and the code below pulls the file location for the image. I am wondering how (if possible) I could apply the repeat-x tag to the image. I know it can be done with html/css but I'm not sure how to go about it in PHP. Thanks in advance. Code: [Select] <?php include 'db.php'; $result=mysql_query("SELECT location FROM header WHERE page='home'"); $row = mysql_fetch_row($result); echo "<img src=images/".$row[0] . "> "; ?> I'm doing some basic object coding to get my head around OOP PHP, but I've come across something I can't get to work. I've got two identical peices of code, MyClass is defined, MyClass2 is then defined as an extension of MyClass. MyClass has three properties Public, Private and Protected. In my first example I can access Public and Protected via a method in MyClass2, this class does NOT have a constructor. The second example has a constructor but I cannot access Public: Code: [Select] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <body> <?php ECHO "MyClass2 does not have a constructor, Public & Protected both echo correctly from MyClass2->printHello!!!<BR>"; /** * Define MyClass */ class MyClass { public $public; protected $protected; private $private; protected $varXXX; function __construct() { $this->public = "Public"; $this->protected = "Protected"; $this->private = "Private"; //$this->printHello(); } function printHello() { echo $this->public . "!!!<BR>"; echo $this->protected . "!!!<BR>"; echo $this->private . "!!!<BR>"; } } /** * Define MyClass2 */ class MyClass2 extends MyClass { // We can redeclare the public and protected method, but not private protected $protected = 'Protected2'; /* function __construct() { echo $this->public . "#<BR>"; echo $this->protected . "#<BR><BR>"; //echo $this->private . "???<BR>"; } */ function printHello() { echo $this->public . "???<BR>"; echo $this->protected . "???<BR><BR>"; //echo $this->private . "???<BR>"; } } $obj = new MyClass(); //echo $obj->public . "<BR>"; // Works //echo $obj->protected; // Fatal Error //echo $obj->private; // Fatal Error //$obj->printHello(); // Shows Public, Protected and Private $obj2 = new MyClass2(); //echo $obj2->public; // Works //echo $obj2->private; // Undefined //echo $obj2->protected; // Fatal Error $obj2->printHello(); // Shows Public, Protected2, Undefined ?> </body> </html> RESULTS IN: Public??? Protected??? Code: [Select] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <body> <?php ECHO "MyClass2 DOES have a constructor, Public does not work from MyClass2->printHello!!!<BR>"; /** * Define MyClass */ class MyClass { public $public; protected $protected; private $private; protected $varXXX; function __construct() { $this->public = "Public"; $this->protected = "Protected"; $this->private = "Private"; //$this->printHello(); } function printHello() { echo $this->public . "!!!<BR>"; echo $this->protected . "!!!<BR>"; echo $this->private . "!!!<BR>"; } } /** * Define MyClass2 */ class MyClass2 extends MyClass { // We can redeclare the public and protected method, but not private protected $protected = 'Protected2'; function __construct() { echo $this->public . "#<BR>"; echo $this->protected . "#<BR><BR>"; //echo $this->private . "???<BR>"; } function printHello() { echo $this->public . "???<BR>"; echo $this->protected . "???<BR><BR>"; //echo $this->private . "???<BR>"; } } $obj = new MyClass(); //echo $obj->public . "<BR>"; // Works //echo $obj->protected; // Fatal Error //echo $obj->private; // Fatal Error //$obj->printHello(); // Shows Public, Protected and Private $obj2 = new MyClass2(); //echo $obj2->public; // Works //echo $obj2->private; // Undefined //echo $obj2->protected; // Fatal Error $obj2->printHello(); // Shows Public, Protected2, Undefined ?> </body> </html> RESULTS IN: # << Missing the property's contents Protected2# ??? << Missing the property's contents Protected2??? Any ideas why I cannot access the property's contents in the second example when the only difference is that it has a constructor? I have a bunch of quasi-static values that must be available to the application. Most of them are set based on settings in a configuration file. Others are based on GET, COOKIE, or SESSION values, and utilize the database to get the actual values. The values will never be written to or modified by the application, only read.
It seems to me that I could create some sort of superclass which includes static methods and properties, and I could access any value by something like superclass::get('some.value'); I could design the class so that the values are queried from the DB or obtained from a parsed file only the first time they are requested, and for future requests, retrieved from a static property.
That being said, I have been told from more than one person that I am just doing it "wrong".
Please let me know what is wrong about it.
Thank you
I have wizard that asks several predefined questions to find-out user needs. at the end it must offer some items based on user answers. all of available items have some properties in common and one or two specific properties. what is the best way or algorithm to do this in JavaScript? e.g: Item 1 Properties: Name Weight Color Size Item 2 Properties: Name Size Weight Item 3 Properties: Name Color Size Thanks. I implemented an endpoint which receives name/value pairs:
PUT someresource/123 {"name": "description", "value": "Some new description"}
I think I made a mistake, and should have implemented it as:
PUT someresource/123 {"description": "Some new description"}
The reason I think so is updating multiple properties is only (easily) possible using the later:
PUT someresource/123 {"description": "Some new description", "otherProperty": "bla bla bla"}
Assuming I am not using some 3rd party client library which only works with name/value pairs, any compelling reason why one shouldn't default to the later approach with key/values? I need to set a deep property if it is undefined or NULL such as shown below:
function setProperty($value, stdClass $config, $p1, $p2, $p3, $p4) {
if(!isset($config->$p1->$p2->$p3->$p4) || is_null($config->$p1->$p2->$p3->$p4)) {
$config->$p1->$p2->$p3->$p4=$value;
}
}
$config=json_decode(json_encode(['a'=>['b'=>['c'=>['x'=>null, 'y'=>123]], 'x'=>123],'x'=>['x'=>123], 'x'=>123]));
setProperty(321, $config, 'a','b','c','x');
setProperty(321, $config, 'a','b','c','y');
But I wish the function to work regardless of property depth and came up with the following. Recommendations for a cleaner way? Maybe I should be working with arrays and array_merge_recursive()?
function setProperty($value, stdClass $config, array $properties) {
$property=array_shift($properties);
if(!count($properties)){
if(!isset($config->$property) || is_null($config->$property)) {
$config->$property=$value;
}
}
else {
if(empty($config->$property) || !is_object($config->$property)) {
$config->$property=new \stdClass();
}
setProperty($value, $config->$property, $properties);
}
}
$config=json_decode(json_encode(['a'=>['b'=>['c'=>['x'=>null, 'y'=>123]], 'x'=>123],'x'=>['x'=>123], 'x'=>123]));
setProperty(321, $config, ['a','b','c','x']);
setProperty(321, $config, ['a','b','c','y']);
Hi, I'm not 100% sure if this is HTML, PHP or Javascript, but my best guess is PHP. When you upload an image on Facebook, it automatically gathers the data about the image, i.e. size, device used (i.e. Canon, iPhone), title and description. It then outputs this on the page. Is there anyway to do this with PHP, instead of having to type all the information out again and upload that with the photo to a database? Cheers. Hello i just want to code a function for my editor that help me to do this: i copy a page with some note and picture in my editor,when i press send bottom editor find IMG tag in and upload it in my own server i can write a function for finding IMG tag and upload,but i don't know how i have to add automatic upload to my server,is there any body here can help me for coding this? or do you know one script or editor that have this properties on it? i use my sample editor Is this an effective way of accessing the $_GET and $_POST properties? I can see that the native $_GET function has been looped through so that $varName would be for example "username" and $value would be "Jeremy". Then they are both stored into an array called $getVars? Is this the best way of doing it, if not then why? foreach($_GET as $varName=>$value) $getVars[$varName]=trim(clean($value, 100)); foreach($_POST as $varName=>$value) $postVars[$varName]=trim(clean($value, 100));[/php] Kind regards, laanes This topic has been moved to Application Frameworks. http://www.phpfreaks.com/forums/index.php?topic=326397.0 Hi there, I am just wondering which way is the correct one if you want to create object properties/attribute dynamically at run time using magic method __set(), __get(), for example: class Foo{ public $data = array(); public function __set($name,$value){ $this->data[$name] = $value; } public function __get($name){ if ( isset($this->data[$name]) ){ return $this->data[$name]; } } } Or using the below way class Foo{ public function assign(array $data){ foreach($data as $key => $value){ $this->$key = $value; } } } I just encountered the second way in many places and I am totally confused . Is the __set() method called implicitly by the PHP engine in the second way or what? how come this is considered as a valid code ? your usual help is appreciated Hi Can you call Class A's methods or properties from Class B's methods? Thanks. |
|||||||