I have this question from the Zend PHP study guide and can't find a proper explanation...
<?php
class Magic {
public $a = "A";
protected $b = array("a"=>"A", "b"=>"B", "c"=>"C");
protected $c = array(1,2,3);
public function __get($v) {
echo "$v,";
return $this->b[$v];
}
public function __set($var, $val) {
echo "$var: $val,";
$this->$var = $val;
}
}
$m = new Magic();
echo $m->a.",".$m->b.",".$m->c.",";
$m->c = "CC";
echo $m->a.",".$m->b.",".$m->c;
?>
According to the guide, solution shall be "b,c,A,B,C,c: CC,b,c,A,B,C". I can't figure out why - maybe you do? My intention is that the first call of $m->a would lead to result "a", but that is obviously wrong...
Since __get() calls echo, some data is being outputted before the echo outside of the class gets called.
Stepping through the first line with echo, this is how it gets executed:
$m->a "A" is concatenated
"," "," is concatenated
$m->b "b," is echoed, "B" is concatenated
"," "," is concatenated
$m->c "c," is echoed, "C" is concatenated
"m" "," is concatenated
At this point, b,c, has already been echoed, and the string with the value of A,B,Cm is now displayed.