PHP排序算法类实例
PHP排序算法类实例
本文实例讲述了PHP排序算法类。分享给大家供大家参考。具体如下:
四种排序算法的PHP实现:
1) 插入排序(Insertion Sort)的基本思想是:
每次将一个待排序的记录,按其关键字大小插入到前面已经排好序的子文件中的适当位置,直到全部记录插入完成为止。
2) 选择排序(Selection Sort)的基本思想是:
每一趟从待排序的记录中选出关键字最小的记录,顺序放在已排好序的子文件的最后,直到全部记录排序完毕。
3) 冒泡排序的基本思想是:
两两比较待排序记录的关键字,发现两个记录的次序相反时即进行交换,直到没有反序的记录为止。
4) 快速排序实质上和冒泡排序一样,都是属于交换排序的一种应用。所以基本思想和上面的冒泡排序是一样的。
1. sort.php文件如下:
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/** * * @author quanshuidingdang */ class Sort { private $arr = array(); private $sort = 'insert'; private $marker = '_sort'; private $debug = TRUE; /** * 构造函数 * * @param array 例如: $config = array ( 'arr' => array(22,3,41,18) , //需要排序的数组值 'sort' => 'insert', //可能值: insert, select, bubble, quick 'debug' => TRUE //可能值: TRUE, FALSE ) */ public function __construct($config = array()) { if ( count($config) > 0) { $this->_init($config); } } /** * 获取排序结果 */ public function display() { return $this->arr; } /** * 初始化 * * @param array * @return bool */ private function _init($config = array()) { //参数判断 if ( !is_array($config) OR count($config) == 0) { if ($this->debug === TRUE) { $this->_log("sort_init_param_invaild"); } return FALSE; } //初始化成员变量 foreach ($config as $key => $val) { if ( isset($this->$key)) { $this->$key = $val; } } //调用相应的成员方法完成排序 $method = $this->sort . $this->marker; if ( ! method_exists($this, $method)) { if ($this->debug === TRUE) { $this->_log("sort_method_invaild"); } return FALSE; } if ( FALSE === ($this->arr = $this->$method($this->arr))) return FALSE; return TRUE; } /** * 插入排序 * * @param array * @return bool */ private function insert_sort($arr) { //参数判断 if ( ! is_array($arr) OR count($arr) == 0) { if ($this->debug === TRUE) { $this->_log("sort_array(insert)_invaild"); } return FALSE; } //具体实现 $count = count($arr); for ($i = 1; $i $tmp = $arr[$i]; for($j = $i-1; $j >= 0; $j--) { if($arr[$j] > $tmp) { $arr[$j+1] = $arr[$j]; $arr[$j] = $tmp; } } } return $arr; } /** * 选择排序 * * @param array * @return bool */ private function select_sort($arr) { //参数判断 if ( ! is_array($arr) OR count($arr) == 0) { if ($this->debug === TRUE) { $this->_log("sort_array(select)_invaild"); } return FALSE; } //具体实现 $count = count($arr); for ($i = 0; $i $min = $i; for ($j = $i+1; $j if ($arr[$min] > $arr[$j]) $min = $j; } if ($min != $i) { $tmp = $arr[$min]; $arr[$min] = $arr[$i]; $arr[$i] = $tmp; } } return $arr; } /** * 冒泡排序 * * @param array * @return bool */ private function bubble_sort($arr) { //参数判断 if ( ! is_array($arr) OR count($arr) == 0) { if ($this->debug === TRUE) { $this->_log("sort_array(bubble)_invaild"); } return FALSE; } //具体实现 $count = count($arr); for ($i = 0; $i for ($j = $count-1; $j > $i; $j--) { if ($arr[$j] $tmp = $arr[$j]; $arr[$j] = $arr[$j-1]; $arr[$j-1] = $tmp; } } } return $arr; } /** * 快速排序 * * @param array * @return bool */ private function quick_sort($arr) { //具体实现 if (count($arr) $key = $arr[0]; $left_arr = array(); $right_arr = array(); for ($i = 1; $i if ($arr[$i] $left_arr[] = $arr[$i]; else $right_arr[] = $arr[$i]; } $left_arr = $this->quick_sort($left_arr); $right_arr = $this->quick_sort($right_arr);
return array_merge($left_arr, array($key), $right_arr); } /** * 日志记录 */ private function _log($msg) { $msg = 'date[' . date('Y-m-d H:i:s') . '] ' . $msg . '\n'; return @file_put_contents('sort_err.log', $msg, FILE_APPEND); } } /*End of file sort.php*/ /*Location htdocs/sort.php */ |
2. sort_demo.php文件如下:
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require_once('sort.php'); $config = array ( 'arr' => array(23, 22, 41, 18, 20, 12, 200303,2200,1192) , //需要排序的数组值 'sort' => 'select', //可能值: insert, select, bubble, quick 'debug' => TRUE //可能值: TRUE, FALSE ); $sort = new Sort($config); //var_dump($config['arr']); var_dump($sort->display()); /*End of php*/ |
希望本文所述对大家的php程序设计有所帮助。

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