PHP Infinite recursive function

/**  * infinite recursive drop-down selection box  * @param $data    array  * @param $pid     parent ID  * @param int $t   Cycles: Action indent  * @param int $selected selected subscript  * @return string  * @author Zhengjingqiang  * @email s cenewood@163.com  * @date 2015-10-22  */function html_options ($data =array (), $pid =0, $t =-1, $selected =0) {&
nbsp;   $html _options = ';
    $t + +;
    $nbspstr = str_repeat ('   ', $t * 4);     if ($data) {        foreach ($data as $k => $v) {  &N bsp;         if ($pid = = $v [' pid ']) {                //Determine if it is the last Drop-down tab                  $symbol _str = (count ($data) = = ($k + 1))?
' ┗ ': ' Out ';                //Decide whether to select                  $selected _str = ($selected = = $v [' id '])?
' Selected= ' selected ': ';                //dropdown selection box data                  $html _options. = ' <option Value= "'. $v [' id ']. "'. $selected _str. ' > '. $nbspstr. $symbol _str. $v [' name '].
' </option> ';                //Infinite loop lookup subset                  $html _options. = Html_
Options ($data, $v [' id '], $t, $selected);
           }        }
   }     return $html _options; /**  * Two-dimensional array recursive  * @param array $arr  * @return array  * @author zhengjingqiang  * @email scenewood@163.com function C Ategory ($arr = Array ()) {    $info = array ();     if (count ($arr) > 0) {  &nbsp ;     foreach ($arr as $k => $vo) {             if ($vo [' pid '] = = 0) {                 foreach ($arr as $v) {                     if ($v [' pid '] = = $VO [' id ']) {                         $vo [' children '] = $v
;                     }                }                 $info
[] = $vo;
           }        }
   }     return $info; /**  * Infinite Classification  * @param $array  * @param int $pid  * @return array  * @author Zhengjingqiang &n bsp;* @email scenewood@163.com  */function Menutree ($array, $pid) {    $arr = array ();   & nbsp foreach ($array as $v) {        if ($v [' pid '] = = $pid) {    &nbs
p;       $tem = Menutree ($array, $v [' id ']);            //Determine if there is a child array      
       $tem && $v [' child '] = $tem;
            $arr [] = $v;        }    }     return $arr;
 }