How to randomly extract elements from an array in php

This article mainly introduces the method of PHP randomly selecting a number of non-repeating elements from an array. It involves common techniques related to PHP array operations. It is of great practical value. Friends who need it can refer to the example of this article.

Describes how PHP randomly selects several non-repeating elements from an array. The specific implementation method is as follows:

The code is as follows:

<?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;
}
$phrases = array(&#39;Hello Sailor&#39;,&#39;Acid Test&#39;,&#39;Bear Garden&#39;,&#39;Botch A Job&#39;,&#39;Dark Horse&#39;,
    &#39;In The Red&#39;,&#39;Man Up&#39;,&#39;Pan Out&#39;,&#39;Quid Pro Quo&#39;,&#39;Rub It In&#39;,&#39;Turncoat&#39;,
    &#39;Yes Man&#39;,&#39;All Wet&#39;,&#39;Bag Lady&#39;,&#39;Bean Feast&#39;,&#39;Big Wig&#39;, &#39;Big Wig&#39;,&#39;Bear Garden&#39;
    ,&#39;All Wet&#39;,&#39;Quid Pro Quo&#39;,&#39;Rub It In&#39;);
print_r(unique_array($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

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