$words=array("l"=>"lemon","o"=>"orange","b"=>"banana","a"=>"apple");
//定義一個回調(diào)函數(shù)，輸出數(shù)組元素
function words_print($value,$key,$prefix){
  echo "$prefix:$key=>$value<br>\n";
}
//定義一個回調(diào)函數(shù)直接改變元素的值
function words_alter(&$value,$key){
  $value=ucfirst($value);
  $key=strtoupper(key);
}
//輸出元素的值
array_walk($words,'words_print','words');
//改變元素的值
array_walk($words,'words_alter');
echo "<pre>";
print_r($words);
echo "</pre>";

class ArrayWalk {
  /**
  * properties:
  */
  var $body_chunk = array('0'=>'Dewen', '1'=>'PHP', 2=>'Linux');
  /////////////////////////////////////////////////
  // VARIABLE METHODS
  /////////////////////////////////////////////////
  function ArrayWalk (){
  }
  function func_1(){
  print_r($this->body_chunk);
  array_walk ($this->body_chunk, array($this,'SpellStrToLower'));
  print_r($this->body_chunk);
  }
  function SpellStrToLower (&$str){
    $str = strtolower ($str);
  }
}
$obj = new ArrayWalk();
echo '<PRE>';
$obj->func_1();
echo '</PRE>';