Php 如何将对象数组类定义作为方法执行USort（）？

使用usort的原因是按名称按字母顺序重新排列顺序，但不知何故，它要么说明函数比较需要是一个数组，要么说明另一个错误，很明显我似乎已经通过了。任何帮助都将不胜感激，提前谢谢

之所以发生这种情况，是因为

usort

调用中的变量不是有效数组。您在任何地方都使用

$this->\u contacts

，但您的usort线路是：

$all -> addContact($billy);

// --> ended up adding each contact manually above

$all->Sort('name',true);
$items = $all->getItems();
foreach($items as $contact)
{
    echo $contact->__toString();
}

$all->sort();

尝试将其更改为：

usort($this->contact, 'ContactList::' . $sortFct);

---

最终以这种方式解决了这个问题，希望它能帮助任何有同样问题的人。多谢太平绅士

usort($this->contact, 'ContactList::' . $sortFct);

usort($this->_contacts, 'ContactList::' . $sortFct);

       <?php 
   class Contact{      
   public $name;      
   public $bgcolor;      
   public $lgcolor;      
   public $email;
   public $element;

      public function __construct($name, $bgcolor, $lgcolor, $email, $element) 
      {         
      $this->name = $name;         
      $this->bgcolor = $bgcolor;         
      $this->lgcolor = $lgcolor;         
      $this->email = $email;  
      $this->element = $element; 

      }    
   }  

   class ContactList implements Iterator, ArrayAccess 
   {     
   public $_label;     
   public $_contacts = array();      
        public function __construct($label) 
        {         
        $this->_label = $label;     
        }      
        public function getLabel() 
        {         
        return $this->_label;     
        }      
        public function addContact(Contact $contact) 
        {        
        $this->_contacts[] = $contact;  

        } 



        public function current() 
        {         
        return current($this->_contacts);     
        }      
        public function key() 
        {         
        return key($this->_contacts);     
        }      
        public function next() 
        {         
        return next($this->_contacts);
        }      
        public function rewind() 
        {         
        return reset($this->_contacts);     
        }      
        public function valid() 
        {         
        return current($this->_contacts);     
        }      
        public function offsetGet($offset) 
        {         
        return $this->_contacts[$offset];     
        }      
        public function offsetSet($offset, $data) 
        {         
        if (!$data instanceof Contact)             
        throw new InvalidArgumentException('Only Contact objects allowed in a ContactList');          
        if ($offset == '') 
        {            
         $this->_contacts[] = $data;         
         } else 
         {             
         $this->_contacts[$offset] = $data;         
         }     
         }      
         public function offsetUnset($offset) 
         {        
         unset($this->_contacts[$offset]);    
         }      
         public function offsetExists($offset) {        
         return isset($this->_contacts[$offset]);    
         }








           /* This is the comparing function to be used with usort to make it alphabetically ordered for All Contacts */

           public function sort_by($field, &$arr, $sorting='SORT_DSC', $case_insensitive=true){
           if(is_array($arr) && (count($arr)>0) && ( ( is_array($arr[0]) && isset($arr[0][$field]) ) || ( is_object($arr[0]) && isset($arr[0]->$field) ) ) ){
            if($case_insensitive==true) $strcmp_fn = "strnatcasecmp";
            else $strcmp_fn = "strnatcmp";

            if($sorting=='SORT_DSC'){
             $fn = create_function('$a,$b', '
              if(is_object($a) && is_object($b)){
               return '.$strcmp_fn.'($a->'.$field.', $b->'.$field.');
              }else if(is_array($a) && is_array($b)){
               return '.$strcmp_fn.'($a["'.$field.'"], $b["'.$field.'"]);
              }else return 0;
             ');

            }else if($sorting=='SORT_ASC'){


             $fn = create_function('$a,$b', '
              if(is_object($a) && is_object($b)){
               return '.$strcmp_fn.'($b->'.$field.', $a->'.$field.');
              }else if(is_array($a) && is_array($b)){
               return '.$strcmp_fn.'($b["'.$field.'"], $a["'.$field.'"]);
              }else return 0;
             ');
            }
            usort($arr, $fn);
            return true;
           }else{
            return false;
           }
          }



    }
   ?

   $all->sort_by('name',$all->_contacts,'SORT_DSC','false');