PHP实现的自定义数组排序函数与排序类示例

/** 二维数组自定义排序函数* uasort($arr,function_name)***/$arr = array(  array('a'=>1,'b'=>'c'),  array('a'=>4,'b'=>'a'),  array('a'=>5,'b'=>'g'),  array('a'=>7,'b'=>'f'),  array('a'=>6,'b'=>'e'));function compare_arr($x,$y){  if($x['b']<$y['b']){    return -1;  }else if($x['b']>$y['b']){    return 1;  }else{    return 0;  }}uasort($arr,'compare_arr');foreach($arr as $a){  echo $a['a'].'=>'.$a['b'].'<br/>';}

class multiSort{   var $key;  //key in your array   //排序函数 参数依次是 数组 待排列索引 排序类型   function run ($myarray, $key_to_sort, $type_of_sort = '')   {     $this->key = $key_to_sort;     if ($type_of_sort == 'desc')       uasort($myarray, array($this, 'myreverse_compare'));     else       uasort($myarray, array($this, 'mycompare'));     return $myarray;   }   //正序   function mycompare($x, $y)   {     if ( $x[$this->key] == $y[$this->key] )       return 0;     else if ( $x[$this->key] < $y[$this->key] )       return -1;     else       return 1;   }   //逆序   function myreverse_compare($x, $y)   {     if ( $x[$this->key] == $y[$this->key] )       return 0;     else if ( $x[$this->key] > $y[$this->key] )       return -1;     else       return 1;   }}