我对php完全不熟悉，已经开始学习它了。我有两份php和html作业。
作业1：
我得储存一些人的名字和他们所有的朋友的名字。我只列出有共同朋友的人。我的问题是，如果一个人和其他人没有共同的朋友，我会收到一条信息“Rana和Roni有0个共同的朋友。我要我阻止：
作业2：
我有一个html表单从上一个php文件中搜索一个人
当我搜索rana时，php表单将打开并打印：
拉纳有四个朋友，他和南迪尼和马蒙有一个共同的朋友。
当我搜索Tanmoy时，页面将打开并打印：
Tanmoy是Rana的朋友，她和Nandini和Mamun有4个朋友和共同的朋友。
为此，我必须使用函数“post/get/request”
这是我目前的代码：

<?php
   # Function: finfCommon

function findCommon($current, $arr) {
    $cUser = $arr[$current];
    unset($arr[$current]);
    foreach ($arr As $user => $friends) {
        $common = array();
        $total = array();
        foreach ($friends As $friend) {
            if (in_array($friend, $cUser)) {
                $common[] = $friend;
            }
        }
        $total = count($common);
        $add = ($total != 1) ? 's' : '';
        $final[] = "<i>{$current} has {$total} friend{$add} in common with {$user}.</i>";
    }
    return implode('<br />', $final);
}

# Array of users and friends

$Friends = array(
    "Rana" => array("Pothik", "Zaman", "Tanmoy", "Ishita"),
    "Nandini" => array("Bonna", "Shakib", "Kamal", "Minhaj", "Ishita"),
    "Roni" => array("Akbar", "Anwar", "Khakan", "Pavel"),
    "Liton" => array("Mahadi", "Pavel"),
    "Mamun" => array("Meheli", "Tarek", "Zaman")
);

# Creating the output value

$output = "<ul>";
foreach ($Friends As $user => $friends) {
    $total = count($friends);
    $common = findCommon($user, $Friends);
    $output .= "<li><u>{$user} has {$total} friends.</u><br /><strong>Friends:</strong>";
    if (is_array($friends) && !empty($friends[0])) {
        $output .= "<ul>";
        foreach ($friends As $friend) {
            $output .= "<li>{$friend}</li>";
        }
        $output .= "</ul>";
    }
    $output .= "{$common}<br /><br /></li>";
}
$output .= "</ul>";

# Printing the output value
print $output;
?>

最佳答案

对于作业1.1：你只需要用一个

if ($total>0) { 
    $output .= "<li><u>{$user} has {$ ...
}

<form action="homework.php" method="get">
   Person: <select name="searchperson" />
     <option> </option>
     ...
     <option> </option>
   </select>
</form>

$friends = array(
  "Rana" => array("Pothik", "Zaman", "Tanmoy", "Ishita"),
  "Nandini" => array("Bonna", "Shakib", "Kamal", "Minhaj", "Ishita"),
  "Roni" => array("Akbar", "Anwar", "Khakan", "Pavel"),
  "Liton" => array("Mahadi", "Pavel"),
  "Mamun" => array("Meheli", "Tarek", "Zaman")
);

// create a flat array with all the known peoples
$knownPeople = array_reduce(
  $friends, 
  function($current, $result) { 
    return array_merge($result, $current);
  }, 
  array_keys($friends)
);

$knownPeople = array_flip(array_flip($knownPeople)); //get rid of duplicates
asort(knownPeople);     // sort the names
$knownPeople = array_values($knownPeople); // normalize the array indexes

function theForm($people) {
  $options = '<option>'.join("</option>\n<option>",$people). '</option>';
  echo "
  <form action=\"homework.php\" method=\"get\">
  <h2>Chose the people you want investigate on:</h2>
  Person: <select name=\"person\" />
    $options
  </select>
  </form>"; 
}

关于php - 在PHP作业方面需要帮助- friend 匹配算法，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4706969/