funky php static quirk.php

<?php
/*
Backward compat version of get_called_class
*/
if (!function_exists('get_called_class')):
  function get_called_class() {
    $bt = debug_backtrace();
    $lines = file($bt[1]['file']);
    preg_match('/([a-zA-Z0-9\_]+)::'.$bt[1]['function'].'/', $lines[$bt[1]['line']-1], $matches);
    return $matches[1];
  }
endif;


class AR {
    static function find() {
        # Delegate non static call to instance method
        if (!is_static_call()) {
            $args = func_get_args();
            $self = cached_instance(__CLASS__);             # <--- from here __class__ is broken
            return call_user_func_array(array($self, '__find'), $args);
        }

        echo __METHOD__ ."\n<br/>";
    }

    function __construct() {
        cache_instance(get_class($this), $this);
    }
    
    function __find() {
        echo __METHOD__ ."\n<br/>";
    }
}

class Person extends AR {}

$p = new Person;
$p->find();                                                 # trying to access instance $p
Person::find();

function is_static_call() {
    $bt = current(array_slice(debug_backtrace(), 1 ,1));
    $f = file($bt['file']);
    return strpos($f[$bt['line']-1], '->'.$bt['function']) === false;
}

function cached_instance($class) {
  if (isset($GLOBALS['__cached_instance'][$class]))
     return $GLOBALS['__cached_instance'][$class];
}

function cache_instance($class, $obj) {
  return $GLOBALS['__cached_instance'][$class] = $obj;
}
?>