Question

我想使用strlen（），substr（）和rand（）从我的名字到屏幕打印一个随机字符。

<html>
<p>
<?php
// Use strlen(), substr(), and rand() to
// print a random character from my name to the screen.
$name = "jordi";

$length = strlen("$name");
$length = rand();
$partial = substr($lengt, 0,5);

print $name. "<br />";
print $length. "<br />";
print $partial. "<br />";
?>
</p>
</html>

现在的结果（数字是随机生成的）：

霍尔迪阿

9286122

92861

有人可以帮我这个。

Answer 1

以下是使用作业所需的所有功能的步骤 -

$nameLength = strlen($name); // gets the length of the name
$randomNumber = rand(0, $nameLength - 1); // generates a random number no longer than the name length
$randomLetter = substr($name, $randomNumber, 1); // gets the substring of one letter based on that random number
echo($randomLetter);

Answer 2

$name = "jordi";
$rndCharIndex = rand(0, strlen($name) - 1);  // random character index for the string
$rndChar = $name[$rndCharIndex];  // Look up the character in that random index
echo $rndChar;

打印出1个随机字母的php函数

2 个答案: