php对象转数组的函数

array get_object_vars ( object $obj )

<?php
class Point2D {
  var $x, $y;
  var $label;
  function Point2D($x, $y)
  {
    $this->x = $x;
    $this->y = $y;
  }
  function setLabel($label)
  {
    $this->label = $label;
  }
  function getPoint()
  {
    return array("x" => $this->x,
           "y" => $this->y,
           "label" => $this->label);
  }
}
// "$label" is declared but not defined
$p1 = new Point2D(1.233, 3.445);
print_r(get_object_vars($p1));
$p1->setLabel("point #1");
print_r(get_object_vars($p1));
?>

Array
 (
     [x] => 1.233
     [y] => 3.445
     [label] =>
 )
 Array
 (
     [x] => 1.233
     [y] => 3.445
     [label] => point #1
 )

function objectToArray($obj) {
  //首先判断是否是对象
  $arr = is_object($obj) ? get_object_vars($obj) : $obj;
  if(is_array($arr)) {
    //这里相当于递归了一下，如果子元素还是对象的话继续向下转换
    return array_map(__FUNCTION__, $arr);
  }else {
    return $arr;
  }
}

function arrayToObject($arr) {
  if(is_array($arr)) {
    return (object)array_map(__FUNCTION__, $arr);
  }else {
    return $arr;
  }
}