Question

我一直在这个论坛和其他网上对这个问题进行一些研究，但我似乎无法弄明白。

我的代码中的一个函数的目标是向现有用户添加5个业力点，或者如果用户不在那里，则创建业力得分为“1”的新用户。用户将在表单中输入用户和ID号，然后该信息将发送到我的PHP脚本。该函数使用该信息来实现其魔力，但输出错误。

我得到的是一个业绩得分为'6'的新用户。我遗漏了一些与此事无关的剧本。

非常感谢任何帮助或建议。

<html>

<head></head>

<body>
<div align="center">
<?php

// Array begin 
$karma_score = array(   array("Userid" => 1, "NameID" => 'Doe', "Karma" => 45, "LastLogin" => "2012-08-30"),
                        array("Userid" => 2, "NameID" => 'Smith', "Karma" => 123, "LastLogin" => "2012-09-02"),
                        array("Userid" => 3, "NameID" => 'Chan', "Karma" => 1, "LastLogin" => "2011-12-23"),
                        array("Userid" => 4, "NameID" => 'Zee', "Karma" => 15, "LastLogin" => "2012-07-01"));

// Counter for amount of users
$counter = count($karma_score);

// Function to print general array
function printArray($a){
    echo '<table border="1px">';
    echo '<tr>';
        foreach(array_keys($a[0]) as $head){
            echo '<th>'.$head.'</th>';
        }
    echo '</tr>';

    foreach($a as $b) {
    echo '<tr>';
        echo '<td>'.$b['Userid'].'</td>';
        echo '<td>'.$b['NameID'].'</td>';
        echo '<td>'.$b['Karma'].'</td>';
        echo '<td>'.$b['LastLogin'].'</td>';
    echo '</tr>';
    }
    echo '</table>';
}

echo '<br>';

function findInfo()
{
    global $karma_score;
    $counter = count($karma_score);

        foreach ($karma_score as $key => $b) {
            if ($b['NameID'] === $_POST['name'])
                $karma_score[$key]["Karma"] += 5;
            else 
                $karma_score[$counter+1] = array("Userid" => $_POST['id'], "NameID" => $_POST['name'], "Karma" => 1, "LastLogin" => date("Y-m-d"));     
        }
    echo "<br> Here is your updated table.";
    printArray($karma_score);
}

if (isset($_POST['submit'])) {
    findInfo();
}

?>

<br>


Please enter name and id. If name exists, add 5. If not, add user.
<form action="" method="POST">
    Name: <input type="text" name="name" placeholder="Enter Name Here">
    ID: <input type="text" name="id" placeholder="Enter ID #">
    <input type="submit" name="submit">


</div>
</body>

</html>

下面是我的输出：第四个表是我点击提交时得到的（我输入的用户是'Alec'，我输入的ID是'5'）。提前谢谢！

enter image description here

编辑：当我提交已经在数组中的用户时会发生这种情况。我想要的结果是用户的简单加5业力分数。

enter image description here

Answer 1

当然，循环总是比较NameID，如果不匹配，则将元素添加到数组，而元素NameID的值不总是与您查找的值相同。在你的循环中已经添加了3次元素数组（其值与你的值不匹配，以防你提交现有值）与相同的键[5] ($count + 1)。所以你可以创建表明你提交的值存在的变量。

function findInfo(){
    global $karma_score;
    $counter = count($karma_score);
    $isExist = false;
    foreach ($karma_score as $key => $b) {
        if ($b['NameID'] === $_POST['name']){
            $karma_score[$key]["Karma"] += 5;
            $isExist = true;
        }
    }
    if(!isExist)
        $karma_score[$counter+1] = array("Userid" => $_POST['id'], "NameID" => $_POST['name'], "Karma" => 1, "LastLogin" => date("Y-m-d"));     
    echo "<br> Here is your updated table.";
    printArray($karma_score);
}

Answer 2

由于数组的第一层只有一个数字索引......你会增加一行，如下所示：

$karma_score[0]['Karma'] += 5;

......但这显然有些不稳定。您可能希望将UserID编号用于不同的数组键。然后，您可以轻松增加给定用户的业力。像这样：

$karma_score = array(   
    1 => array("Userid" => 1, "NameID" => 'Doe', "Karma" => 45, "LastLogin" => "2012-08-30"),
    2 => array("Userid" => 2, "NameID" => 'Smith', "Karma" => 123, "LastLogin" => "2012-09-02"),
    3 => array("Userid" => 3, "NameID" => 'Chan', "Karma" => 1, "LastLogin" => "2011-12-23"),
    4 => array("Userid" => 4, "NameID" => 'Zee', "Karma" => 15, "LastLogin" => "2012-07-01"));

如果你这样做，那么你就可以了;例如;

$karma_score[4]['Karma'] += 5; // Would increment Zee's karma

...没有遍布整个地方试图找到与用户ID相匹配的行。但那里的相当笨重。您可能会考虑在某个时刻将所有这些数据丢弃到数据库中。你也可以：

$karma_score['Zee']['Karma'] += 5;

......真的摆脱了那个不必要的循环。为您创建问题，将为您创造更多问题......由于代码，兄弟会进行一些逻辑清理。 :)

Answer 3

你的问题在于：

foreach ($karma_score as $key => $b) {
    if ($b['NameID'] === $_POST['name'])
        $karma_score[$key]["Karma"] += 5;
    else 
        $karma_score[$counter+1] = array("Userid" => $_POST['id'], "NameID" => $_POST['name'], "Karma" => 1, "LastLogin" => date("Y-m-d"));     
}

你不需要foreach，试试我的代码：

<html>

<head></head>

<body>
<div align="center">
<?php

// Array begin 
$karma_score = array(   array("Userid" => 1, "NameID" => 'Doe', "Karma" => 45, "LastLogin" => "2012-08-30"),
                        array("Userid" => 2, "NameID" => 'Smith', "Karma" => 123, "LastLogin" => "2012-09-02"),
                        array("Userid" => 3, "NameID" => 'Chan', "Karma" => 1, "LastLogin" => "2011-12-23"),
                        array("Userid" => 4, "NameID" => 'Zee', "Karma" => 15, "LastLogin" => "2012-07-01"));

// Counter for amount of users
$counter = count($karma_score);

// Function to print general array
function printArray($a){
    echo '<table border="1px">';
    echo '<tr>';
        foreach(array_keys($a[0]) as $head){
            echo '<th>'.$head.'</th>';
        }
    echo '</tr>';

    foreach($a as $b) {
    echo '<tr>';
        echo '<td>'.$b['Userid'].'</td>';
        echo '<td>'.$b['NameID'].'</td>';
        echo '<td>'.$b['Karma'].'</td>';
        echo '<td>'.$b['LastLogin'].'</td>';
    echo '</tr>';
    }
    echo '</table>';
}

echo '<br>';

function findInfo()
{
    global $karma_score;
    $counter = count($karma_score);

    //if php>5.5.0 use $names = array_column($karma_score, 'NameID');
    $names = array_map(function($element){return $element['NameID'];}, $karma_score);
    if(in_array($_POST['name'], $names)) {
       $key = array_search($_POST['name'], $names);
       $karma_score[$key]['Karma'] += 5;
    } else {
      $karma_score[$counter] = array("Userid" => $_POST['id'], "NameID" => $_POST['name'], "Karma" => 1, "LastLogin" => date("Y-m-d"));             
    }       

    echo "<br> Here is your updated table.";
    printArray($karma_score);
}

if (isset($_POST['submit'])) {
    findInfo();
}

?>

<br>


Please enter name and id. If name exists, add 5. If not, add user.
<form action="" method="POST">
    Name: <input type="text" name="name" placeholder="Enter Name Here">
    ID: <input type="text" name="id" placeholder="Enter ID #">
    <input type="submit" name="submit">


</div>
</body>

</html>

如何在PHP中向多维数组添加元素？

3 个答案: