php数组函数array_walk用法示例

$words=array("l"=>"lemon","o"=>"orange","b"=>"banana","a"=>"apple");
//定义一个回调函数，输出数组元素
function words_print($value,$key,$prefix){
  echo "$prefix:$key=>$value<br>n";
}
//定义一个回调函数直接改变元素的值
function words_alter(&$value,$key){
  $value=ucfirst($value);
  $key=strtoupper(key);
}
//输出元素的值
array_walk($words,'words_print','words');
//改变元素的值
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>';