php recursion loop

php recursion loop

<?php
// php loop based on recursion
// why do we need while / for statement in program language?
// and in php, I cannot pass php function to php function as function arg. :-(
// Anonymous functions are available since PHP 5.3.0. http://us2.php.net/manual/en/functions.anonymous.php
// I am using 5.2.6 now. 
class Foo
{  
  public function loop($a,$b)
  {
    if ( $a >= 0 && $b >= $a )
    {
      print("I am\n");
      $a++; $this->loop($a,$b); 
    }
  }
}
 
$foo = new Foo();
$foo->loop(1,4);
 
?>