Php 如何在数组中获取特定长度的字符串？

我正在生成一个5-10的整数

生成5-10之间的整数后，循环应在数组中选择一个字符串，该字符串的字符长度基于生成的随机整数

例如：

生成的随机整数：10

系统应显示一个长度为10个字符的字符串，以便显示testNames1或testNames2，因为它的长度为10个字符

我试着在我的代码上这样做，但不起作用

<?php
  function getName(){

    $names = array(
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );
    
    $randomString = "";
    
    for ($i = 0; $i <count($names); $i++) {
        $value = rand(5,10);
        $length_string = strlen($names[$i]);

        if ($value == $length_string) {
            return "name:".$names[$i].$value;
        }
 
    }

  }

echo getName();
?>

---

有人能帮我做这件事吗？

你可以试试下面的代码。您在循环中添加了下面的行，这是错误的

$value = rand(5,10);

现在，这个程序将返回一个名称，该名称将等于生成的5到10之间的随机数。如果根据随机数不存在名称，它也将返回消息。例如：8

<?php
function getName($random_num)
{
    $names = array
    (
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );
    $randomString = "";
    for ($i = 0; $i <count($names); $i++)
    {
        $length_string = strlen($names[$i]);
        if ($random_num == $length_string)
        {
            return "name:".$names[$i].$random_num;
        }
    }
}
$random_num = rand(5,10);
$returned_name = getName($random_num);
if ($returned_name == "")
{
    echo "No Name Exist having length: " . $random_num;
}
else
{
    echo $returned_name;
}
?>

---

您可以尝试下面的代码。您在循环中添加了下面的行，这是错误的

$value = rand(5,10);

现在，这个程序将返回一个名称，该名称将等于生成的5到10之间的随机数。如果根据随机数不存在名称，它也将返回消息。例如：8

<?php
function getName($random_num)
{
    $names = array
    (
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );
    $randomString = "";
    for ($i = 0; $i <count($names); $i++)
    {
        $length_string = strlen($names[$i]);
        if ($random_num == $length_string)
        {
            return "name:".$names[$i].$random_num;
        }
    }
}
$random_num = rand(5,10);
$returned_name = getName($random_num);
if ($returned_name == "")
{
    echo "No Name Exist having length: " . $random_num;
}
else
{
    echo $returned_name;
}
?>

---

您需要做的是首先创建一个与长度匹配的字符串列表，然后从中随机选取一个字符串。因此，循环遍历所有字符串，检查长度并添加到$match，然后使用array_rand选择一个匹配的字符串

function getName($random_num)
{
    $names = array
    (
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );
    $randomString = "";
    $match = [];
    foreach ( $names as $name )
    {
        $length_string = strlen($name);
        if ($random_num == $length_string)
        {
            $match[] = $name;
        }
    }
    // If non found return ''
    return !empty($match) ? $match[array_rand($match)] : '';
}

---

您需要做的是首先创建一个与长度匹配的字符串列表，然后从中随机选取一个字符串。因此，循环遍历所有字符串，检查长度并添加到$match，然后使用array_rand选择一个匹配的字符串

function getName($random_num)
{
    $names = array
    (
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );
    $randomString = "";
    $match = [];
    foreach ( $names as $name )
    {
        $length_string = strlen($name);
        if ($random_num == $length_string)
        {
            $match[] = $name;
        }
    }
    // If non found return ''
    return !empty($match) ? $match[array_rand($match)] : '';
}

---

你就快到了。。。您只需在外部生成随机数，然后进行如下检查：

<?php
function getName($random_num)
{
    $matches= [];
    $names = array(
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );

    $value = rand(5,10);
  
    for ($i = 0; $i <count($names); $i++) {
       
        if(strlen($names[$i]) == $value)
        {
            $matches[] = $names[$i];
          
        }
    }
 
    print_r($matches);
}

?>

---

你就快到了。。。您只需在外部生成随机数，然后进行如下检查：

<?php
function getName($random_num)
{
    $matches= [];
    $names = array(
        'Juans',
        'Luisss',
        'Pedroaa',
        'testNames1',
        'testNames2',
        'testName3',
        'test', //This should not be return because im only generating a number random of 5-10 and this character has only 4 character length
        'tse', //This should not be return because im only generating a number random of 5-10 and this character has only 3 character length
        // and so on
    );

    $value = rand(5,10);
  
    for ($i = 0; $i <count($names); $i++) {
       
        if(strlen($names[$i]) == $value)
        {
            $matches[] = $names[$i];
          
        }
    }
 
    print_r($matches);
}

?>

---

哦我离我的问题太近了！：。非常感谢，先生！我非常感激它，所以我仍然可以问，如果有两个字符串具有相同的字符长度，该怎么办？如何从中随机选择1个？此程序将仅返回数组中的第一个。它不会返回2个值。是否有方法从2个长度相同的值中随机选择一个？是的，在这种情况下，您必须从函数返回数组。然后使用array_rand函数从数组中随机选择一个键！我离我的问题太近了！：。非常感谢，先生！我非常感激它，所以我仍然可以问，如果有两个字符串具有相同的字符长度，该怎么办？如何从中随机选择1个？此程序将仅返回数组中的第一个。它不会返回2个值。是否有方法从2个长度相同的值中随机选择一个？是的，在这种情况下，您必须从函数返回数组。然后使用array_rand函数从数组中随机选择一个键谢谢。这对我很有帮助，先生！我已经理解了我的错误，这也解决了在具有相同字符长度的多个值中选择一个值的问题！谢谢你，先生！非常感谢。这对我很有帮助，先生！我已经理解了我的错误，这也解决了在具有相同字符长度的多个值中选择一个值的问题！谢谢你，先生！