PHP sorting algorithm class example_PHP tutorial

PHP sorting algorithm class example

This article describes the PHP sorting algorithm class through examples. Share it with everyone for your reference. The details are as follows:

PHP implementation of four sorting algorithms:

　1) The basic idea of ​​Insertion Sort is:

Each time a record to be sorted is inserted into the appropriate position in the previously sorted sub-file according to its key size, until all records are inserted.

2) The basic idea of ​​Selection Sort is:

In each pass, the record with the smallest keyword is selected from the records to be sorted, and the order is placed at the end of the sorted sub-file until all records are sorted.

3) The basic idea of ​​bubble sort is:

Compare the keywords of the records to be sorted pairwise. If it is found that the order of the two records is reversed, the order will be exchanged until there are no records in the reverse order.

4) Quick sort is essentially the same as bubble sort, and is an application of exchange sort. So the basic idea is the same as the bubble sort above.

1. The sort.php file is as follows:

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 /** * * @author quanshuidingdang */ class Sort { private $arr = array(); private $sort = 'insert'; private $marker = '_sort'; private $debug = TRUE; /** * Constructor * * @param array For example: $config = array ( 'arr' => array(22,3,41,18) , //Array values ​​that need to be sorted 'sort' => 'insert', //Possible values: insert, select, bubble, quick 'debug' => TRUE //Possible values: TRUE, FALSE ) */ public function __construct($config = array()) { if ( count($config) > 0) { $this->_init($config); } } /** * Get sorted results */ public function display() { return $this->arr; } /** * Initialization * * @param array * @return bool */ private function _init($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($this->arr))) return FALSE; return TRUE; } /** * Insertion sort * * @param array * @return bool */ private function insert_sort($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 < $count; $i ) { $tmp = $arr[$i]; for($j = $i-1; $j >= 0; $j--) { if($arr[$j] > $tmp) { $arr[$j 1] = $arr[$j]; $arr[$j] = $tmp; } } } return $arr; } /** * Select sort * * @param array * @return bool */ private function select_sort($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 < $count-1; $i ) { $min = $i; for ($j = $i 1; $j < $count; $j ) { if ($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 < $count; $i ) { for ($j = $count-1; $j > $i; $j--) { if ($arr[$j] < $arr[$j-1]) { $tmp = $arr[$j]; $arr[$j] = $arr[$j-1]; $arr[$j-1] = $tmp; } } } return $arr; } /** * Quick sort * * @param array * @return bool */ private function quick_sort($arr) { //具体实现 if (count($arr) <= 1) return $arr; $key = $arr[0]; $left_arr = array(); $right_arr = array(); for ($i = 1; $i < count($arr); $i ){ if ($arr[$i] <= $key) $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), $right_arr); } /** * Logging */ private function _log($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*/

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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。 http://www.bkjia.com/PHPjc/1018376.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/1018376.htmlTechArticlePHP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...