Question

php如何做到从一个数组里随机选两个不相等的值

<?php
$arr1=array("A","B","C","D","E");
$a=rand(0,4);
$b=rand(0,4);
if($a!=$b){
echo "$arr1[$a]"."vs"."$arr1[$b]";
}
?>
像这样选出两个值，但现在这个有可能选出相等的两个值。

Answer 1

<?php
$arr1=array("A","B","C","D","E");
$keys = array_rand($arr1, 2);
echo $arr1[$keys[0]].'vs'.$arr1[$keys[1]];

用array_rand()可以直接用第二个参数在数组里随机出你要的数据，不会随机到同一个

Answer 2

<?php
$arr1=array("A","B","C","D","E");
$a=rand(0,4);
$b=rand(0,4);
while($a==$b){
$a=rand(0,4);
$b=rand(0,4);

 }
  echo "$arr1[$a]"."vs"."$arr1[$b]";
 
?>
加个循环

Answer 3

<?php

$arr1=array("A","B","C","D","E");
$a=rand(0,4);
$b=rand(0,4);
while($a==$b){
$b=rand(0,4);
}
if($a!=$b){
echo "$arr1[$a]"."vs"."$arr1[$b]";
}

?>

Answer 4

你直接判断它的值是否相等

if ($arr1[$a] != $arr1[$b]) {
	echo $arr1[$a]."vs".$arr1[$b];
}

Answer 5

$ran = array_rand($arr, 2);
php自带函数 array_rand 不会重复