call_user_method

(PHP 4, PHP 5)

call_user_method Chiama un metodo dell'oggetto indicato [deprecated]

Descrizione

mixed call_user_method ( string $nome_metodo , object &$obj [, mixed $parametro [, mixed $... ]] )
Avviso

A partire dalla versione 4.1.0 l'uso della funzione call_user_method() รจ sconsigliato; in sostituzione utilizzare la serie call_user_func() con la sintassi array(&$obj, "method_name").

Richiama il metodo indicato da nome_metodo dell'oggetto oggetto. Di seguito si fornisce un esempio di utilizzo. Qui si definisce una classe, si istanzia un oggetto, e si utilizza call_user_method() per richiamare il metodo stampa_info

<?php
class Stato {
    var 
$NOME;
    var 
$TLD;
    
    function 
Stato($nome$tld
    {
        
$this->NOME $nome;
        
$this->TLD $tld;
    }

    function 
stampa_info($prestr "") {
        echo 
$prestr "Stato: " $this->NOME "\n";
        echo 
$prestr "Dominio di primo livello: " $this->TLD "\n";
    }
}

$paese = new Stato("Peru""pe");

echo 
"* Richiamo il metodo direttamente\n";
$paese->stampa_info();

echo 
"\n* utilizzo dello stesso metodo in modo indiretto\n";
call_user_method("stampa_info"$paese"\t");
?>

Vedere anche call_user_func_array() e call_user_func().

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User Contributed Notes 5 notes

up
0
ravichandran_11 at yahoo dot co dot in
6 years ago
<?php
class abc{
   function
func($argument)  {
      
$argument="It works";
   }
}
$obj=new abc;
$argument_to_be_changed="No it doesn't work";
call_user_method("func", $obj, &$argument_to_be_changed);
echo
"Result : ".$argument_to_be_changed;
?>

This code is working. But will through some warning message which you can hide by configuring php.ini
up
0
j dot h at h-elektro dot de
7 years ago
It does not work to use Pointers as Arguments:

<?php
class abc{
   function
func(&$argument)  {
      
$argument="It works";
   }
}

$obj=new abc;
$argument_to_be_changed="No it doesnt";
call_user_method("func", $obj, $argument_to_be_changed);

echo
"Result".$argument_to_be_changed;
?>

The result is: "No it doesnt".

Regards
der Jan
up
0
paulo at emd dot com dot br
13 years ago
This function is very similar to this:

<?php
$method
="Print";
$object->$method($param1,$param2);
?>

Note the extra $ after the ->
up
-1
Chris
5 years ago
From what i've observed, call_user_func() does everything this funciton does and a little more.  I made a pretty good example call_user_func()'s usage with object instances and figured it might be useful here:

<?php

   
/**
   
        This is a demonstration of 2 neat features of PHP
       
        *    passing array arguments in as a big array, and using += to assign defaults to missing values
                This would allow for function calls that more closely mimick thoes made in javascript using JSON, with enough work, it could be almost identical using associative arrays
        *    function callbacks within a class to global instances of other classes
                This allows you pass a function callback to an object early on, and hold off its execution until later in the program (say during page outputing after everything has been setup)
   
    **/

   
class Runner {
   
        public
$id;
       
        public function
__construct($id) {
           
$this->id = $id;
            echo
"constructing " . __CLASS__ . " with id of $id<br />\n";
        }
       
        public function
run($distance = null, $measurement = 'km') {
            if (
$distance) {
                echo
'I ran ' . $distance . ' ' . $measurement . '.';
            } else {
                echo
'I ran.';
            }
            echo
"({$this->id})<br />\n";
        }
    }
   
    class
Speaker {
   
        public
$id;
   
        public function
__construct($id = 0) {
           
$this->id = $id;
            echo
"constructing " . __CLASS__ . " with id of $id<br />\n";
        }
       
        public function
speak($statement = 'hello world') {
            echo
$statement . "({$this->id})<br />\n";
        }
    }

    class
Test {
        protected
$runCallback = null;
        protected
$speakCallback = null;
        protected
$statement;
        protected
$distance;
       
        public function
__construct(array $params = array()) {
            echo
"constructing " . __CLASS__ . "<br />\n";
           
$params += array('speakCallback' => array('Speaker', 'speak'), 'runCallback' => array('Runner', 'run'), 'statement' => 'Hello from ' . __CLASS__ . ' class!', 'distance' => 10);
            foreach(
$params as $k => $v) {
               
$this->$k = $v;
            }
        }
       
        public function
getInstance() {
            return new
self(current(func_get_args()));
        }
       
        public function
callRunner() {
            if (
is_callable($this->runCallback))
                return
call_user_func($this->runCallback, $this->distance);
            else
                throw new
Exception("runCallback is not callable\n" . var_export($this->runCallback, true) . "\n");
        }
        public function
callSpeaker() {
            if (
is_callable($this->speakCallback))
                return
call_user_func($this->speakCallback, $this->statement);
            else
                throw new
Exception("speakCallback is not callable\n" . var_export($this->speakCallback, true) . "\n");
        }
    }
   
   
$r = new Runner(1);
   
$s = new Speaker(2);
   
   
// Note that we're using $s instead of 'Speaker'
   
call_user_func(array($s, 'speak'), 'Hello from global!');
   
   
// try out from global with call_user_func_array() to pass args as an array
   
call_user_func_array(array($r, 'run'), array(5, 'mi'));
   
   
   
$Test = new Test(array('runCallback' => array($r, 'run'), 'speakCallback' => array($s, 'speak')));
   
$Test->callRunner();
   
$Test->callSpeaker();
   
   
   
$Test = call_user_func(array('Test', 'getInstance'), array('runCallback' => array($r, 'run'), 'distance' => 15));
   
// should work as expected
   
$Test->callRunner();
   
// should throw an error for trying to use this during a static call to Speaker::speak() because of the default
   
$Test->callSpeaker();
   
   
?>

Hope that's helpful.
up
-1
jmcastagnetto at php dot net
13 years ago
You can pass a variable number of parameters to a function, use a definition like:

function mymethod ($v1, $v2, $v3="", $v4="")

and then you can pass 2, 3 or 4 parameters. This is explained in the "Functions" section of the manual.

See also the PHP4 functions: func_num_args(), func_get_arg(), and func_get_args(), and examples therein
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