博客

usort() 用户自定义排序的实现

2. 
   
   function
   
   
   multi_compare(
   
   
   $a
   
   
   ,
   
   
   $b
   
   
   )
   
   
3. 
   {
   
4. 
   
   $criteria
   
   
   =
   
   
   array
   
   
   (
   
   
5. 
   
   ‘gold’
   
   
   =>
   
   
   ‘desc’
   
   
   ,
   
   
6. 
   
   ‘ts’
   
   
   =>
   
   
   ‘desc’
   
   
   
   
   //这里还可以根据需要继续加条件 如:’x’=>’asc’等
   
   
   
   
7. 
   );
   
8. 
   
   foreach
   
   
   (
   
   
   $criteria
   
   
   
   
   as
   
   
   
   
   $what
   
   
   =>
   
   
   $order
   
   
   ){
   
   
9. 
   
   if
   
   
   (
   
   
   $a
   
   
   [
   
   
   $what
   
   
   ] ==
   
   
   $b
   
   
   [
   
   
   $what
   
   
   ]){
   
   
10. 
    
    continue
    
    
    ;
    
    
11. 
    }
    
12. 
    
    return
    
    
    ((
    
    
    $order
    
    
    ==
    
    
    ‘desc’
    
    
    )?-1:1) * ((
    
    
    $a
    
    
    [
    
    
    $what
    
    
    ] <
    
    
    $b
    
    
    [
    
    
    $what
    
    
    ]) ? -1 : 1);
    
    
13. 
    }
    
14. 
    
    return
    
    
    0;
    
    
15. 
    }
    
    

1. 
   
   usort(
   
   
   $sorted_array
   
   
   ,
   
   
   “multi_compare”
   
   
   );