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 result
print_r（unique_array（$phrases, 5））;
// Returns 5 unique results
print_r（unique_array（$phrases, 5, false））;
// Returns 5 results, but may have duplicates if
// there are duplicates in original array
print_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。