Wolfram Kriesing writes: > why do the following two examples result in different things, even > though i would expect the same behaviour?
>From the manual: http://www.php.net/manual/en/language.references.return.php function &find_var ($param) { ...code... return $found_var; } $foo =& find_var ($bar); $foo->x = 2; In this example, the property of the object returned by the find_var function would be set, not the copy, as it would be without using reference syntax. Note: Unlike parameter passing, here you have to use & in both places - to indicate that you return by-reference, not a copy as usual, and to indicate that reference binding, rather than usual assignment, should be done for $foo. ...in other words, your problem is here: > $test = new test; > // but this one does NOT !!! > $walk = $test->getData(0); ^^^ ...it should be: $walk =& $test->getData(0); > $walk = $test->data[1]; > print('<br>'); > print_r($test); Cheers, Torben > in words: i pass a reference of a class-property to a variable $walk, > if i overwrite $walk, the class-property has a new value too (seems > logical, since we are working with references not pointers) > BUT > if i use a class-method which returns a reference to this > class-property, to set $walk ... and then i overwrite $walk the > class-property didnt change > > > code-example > <?php > > class test > { > var $data; > function test() > { > $this->data[0] = 'level zero'; > $this->data[1] = 'level one'; > } > > function &getData( $id ) > { > return $this->data[$id]; > } > } > > $test = new test; > print('<br>'); > print_r($test); > > // the following block overwrites $test->data[0] with $test->data[1] > $walk = &$test->data[0]; > $walk = $test->data[1]; > print('<br>'); > print_r($test); > > > $test = new test; > // but this one does NOT !!! > $walk = $test->getData(0); > $walk = $test->data[1]; > print('<br>'); > print_r($test); > > ?> > > -- > Wolfram > > -- > PHP Development Mailing List <http://www.php.net/> > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > -- Torben Wilson <[EMAIL PROTECTED]> http://www.thebuttlesschaps.com http://www.hybrid17.com http://www.inflatableeye.com +1.604.709.0506 -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
