Static properties and variable classnames

By chx ~ Posted Tue, 07/06/2010 - 20:13

Oh no!

<?php
class test {
  static public $foo = 'test1';
  static public $bar = 'test2';
  function foo() {
    print "method foo\n";
  }
}

class test1 {
  function __construct() {
    print "test1 constructor\n";
  }
}
class test2 {
  function __construct() {
    print "test2 constructor\n";
  }
}

function test1() {
  print "test1 function\n";
}
function test2() {
  print "test2 function\n";
}
function foo() {
  print "foo function\n";
  return 'bar';
}

$foo = 'foo';

$a = test::$foo;
new $a();
new test::$foo();
$a();
print test::$foo();
?>

test1 constructor
test1 constructor
test1 function
method foo

Comments

Wow

Submitted by Steven Don (not verified) on Wed, 07/07/2010 - 13:56.

This does my head in, though it would help if the sample were a little cleaner. There seems to be much unused code in there. All the first parts seem to make a lot of sense, given the idea of variable variables. For the life of my, I can't figure out why that last one should result in the method call though. That's the only one that seems unintuitive.

Binding precedence

Submitted by Larry Garfield (not verified) on Mon, 07/12/2010 - 14:55.

In the last line, $foo is being evaluated to the string 'foo' first, and then test::foo() is being called. That part makes sense.

The oddball here is that A::$b apparently means "Static variable b of class A" if there is no $b in scope at the time, but "Static variable the value of b in class A" if there is. That is, $ binds higher than :: does.

$ binding higher than :: explains all of the above code quite readily, even if it ends up looking bizarre. The alternative would make it impossible to call a variable class method or class property.

That said, I now have to wonder if there aren't security implications there...

This is perfectly legal,

Submitted by georgene saro (not verified) on Sun, 07/10/2011 - 22:48.

This is perfectly legal, anything inside the braces is executed first, the return value then becomes the variable name. Echoing the same variable variable using the function that created it results in the same return and therefore the same variable name is used in the echo statement. Have fun ;).
Rolex Watches

This looks like normal

Submitted by Anonymous (not verified) on Wed, 08/17/2011 - 12:18.

This looks like normal behavior to me. PHP is doing it correctly. You're underestimating the flexibility thats available to you in here.

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Static properties and variable classnames

Comments

Wow

Binding precedence

This is perfectly legal,

This looks like normal

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