php从数组中随机选择若干不重复元素的方法

本文实例讲述了php从数组中随机选择若干不重复元素的方法。分享给大家供大家参考。具体实现方法如下：

复制代码 代码如下:<?php/* * $array = the array to be filtered * $total = the maximum number of items to return * $unique = whether or not to remove duplicates before getting a random list */function unique_array($array, $total, $unique = true){    $newArray = array();    if((bool)$unique){        $array = array_unique($array);    }    shuffle($array);    $length = count($array);    for($i = 0; $i < $total; $i++){        if($i < $length){            $newArray[] = $array[$i];        }    }    return $newArray;}$phrases = array("Hello Sailor","Acid Test","Bear Garden","Botch A Job","Dark Horse",    "In The Red","Man Up","Pan Out","Quid Pro Quo","Rub It In","Turncoat",    "Yes Man","All Wet","Bag Lady","Bean Feast","Big Wig", "Big Wig","Bear Garden"    ,"All Wet","Quid Pro Quo","Rub It In");print_r(unique_array($phrases, 1));// Returns 1 resultprint_r(unique_array($phrases, 5));// Returns 5 unique resultsprint_r(unique_array($phrases, 5, false));// Returns 5 results, but may have duplicates if// there are duplicates in original arrayprint_r(unique_array($phrases, 100));// Returns 100 unique results    print_r(unique_array($phrases, 100, false));// Returns 100 results, but may have duplicates if// there are duplicates in original array

希望本文所述对大家的php程序设计有所帮助。