Question

任务描述是使用函数：count（），rand（）和strtoupper（）来获取所有大写的PHP数组中的随机名称。代码：http://ideone.com/nwjyoa

<?php
// Create an array and push on the names
$friends=array("Mike", "Ondrej", "Honza", "Danca", "Misa", "Verca");
array_push($friends, "Michal", "Vendulka", "Daniela");
// Sort the list
sort($friends);
// Randomly select a winner!
$winner = array_rand($friends, 1);
echo "<p>$winner</p>";
// Print the winner's name in ALL CAPS
?>

我到目前为止从阵列中选择一个随机值，但它给出了它的编号（位置），而不是名称：/
你能指点我解决问题吗？

Answer 1

如果它返回索引，只需获取数组中该给定索引处的值：

$index = array_rand($friends, 1); // or $index = rand() % count($friends);
$winner = $friends[$index];

Answer 2

如果array_rand返回索引，则应将该索引用于$friends数组以获取其值。

$winner = array_rand($friends, 1);
$winner_name = strtoupper($friends[$winner]);
echo "<p>$winner_name</p>";

Answer 3

您正在获取数组索引。只做$ friends [$ winner]而不是。

<?php
// Create an array and push on the names
$friends=array("Mike", "Ondrej", "Honza", "Danca", "Misa", "Verca");
array_push($friends, "Michal", "Vendulka", "Daniela");
// Sort the list
sort($friends);
// Randomly select a winner!
$winner = array_rand($friends, 1);
echo "<p>$friends[$winner]</p>";
// Print the winner's name in ALL CAPS
?>

Answer 4

你需要使用如下

echo $friends[$winner];

Answer 5

使用array_rand中的值作为$friends数组的键。

$winner = strtoupper($friends[array_rand($friends, 1)]);

Answer 6

获取Randdom值形式数组的简单方法。

    let calledStatus = 0; // some flag variable to remember if function is called
    window.onscroll  = function(){ 
        element =  document.querySelector( '.some element' );
        clientRect = element.getBoundingClientRect();

        if( clientRect.top < window.innerHeight && clientRect.top > ( clientRect.height * -1) && calledStatus == 0){
            //call your function or do other stuff
            console.log('called' )
              calledStatus = 1;

        }
    }

现在每次您从Array中获得不同的颜色。

以您为例。

$color_array =["red","green","blue","light_orange"];
$color_array[rand(0,3)]

Answer 7

<?php
// Create an array and push on the names
// of your closest family and friends
$family_friends=array();

array_push($family_friends, "Marlon");
array_push($family_friends, "Johanna");
array_push($family_friends, "Leonary");
array_push($family_friends, "Sueann");
array_push($family_friends, "Olucho");
array_push($family_friends, "Allyah");
array_push($family_friends, "Reyna");
array_push($family_friends, "Cinil");
array_push($family_friends, "Carl");
array_push($family_friends, "Martain");
array_push($family_friends, "Christell");
array_push($family_friends, "Joy");

// Sort the list
$sorted = sort($family_friends);


$counted = count($family_friends);

print $counted;

// Randomly select a winner!

$win = array_rand($family_friends,1);

// Print the winner's name in ALL CAPS

$winner = strtoupper($win);
print "<p>$family_friends[$winner] </p>"; ?>

PHP - rand（） - 来自名称数组的随机值

7 个答案: