用函数生成select选择框

 1 // 生成 html select option 标签
 2 function build_options($options, $opt=‘‘,$k=‘‘) {
 3     $frags  = array();
 4     if (is_string($options))
 5     {
 6         if (FALSE !== strpos($options, ‘,‘)) {
 7             $options = explode(‘,‘, $options);
 8         } else if (FALSE !== strpos($options, ‘ ‘)) {
 9             $options = explode(‘ ‘, $options);
10         } else{
11             return  ‘‘;
12         }
13         if ($opt && !in_array($opt, $options))
14         {
15             array_unshift($options, $opt);
16         }
17 
18         $options = array_combine($options, $options);
19     }
20     if (is_array($options))
21     {
22         if($opt && !in_array($opt,$options))
23         {
24             array_unshift($options,$opt);
25         }
26         foreach ($options as $key=>$val)
27         {
28             if ($opt!==‘‘&&$k!==‘‘&&$key == $opt)
29             {
30                 //后来添加的那个元素中还有键 说明传入了k
31                 $key=$k;
32             }
33             $frags[] = sprintf(‘<option value="%s" %s>%s</option>‘,$key, $opt != ‘‘ && $key == $opt ? ‘selected‘ : ‘‘, $val);
34         }
35     }
36 
37     return  implode("\n", $frags);
38 }