Question

<?php
$files = glob( 'docs/*.xml' );
if ( isset( $_GET['doctype'] ) == "all" ) {
    foreach ( $files as $file ) {
        $xml = new SimpleXMLElement( $file, 0, true );
        echo'
                <tr>
                <td id="'. $xml->doctype .'" name="'. $xml->doctype .'" class="mainTable">' . $xml->doctype . '</td>
                <td><a href="viewdoc.php?docname=' . basename( $file, '.xml' ) . '&username='. $xml->startedby .'&myname='. $_SESSION['username'] .'">' . basename( $file, '.xml' ) . '</a></td>
                <td><a href="viewprofile.php?name='. $xml->startedby .'">'. $xml->startedby .'</a></td>
                <td>'. $xml->date .'</td>
                <td>* * * * *</td>
                <td>'. filesize( $file ) .'kb</td>
                </tr>
                ';
    }
}
else if ( isset( $_GET['doctype'] ) == "doc" ) {
        foreach ( $files as $file ) {
            $xml = new SimpleXMLElement( $file, 0, true );
            // code filter the $xml->doctype by equal it to currect value - which i'm not sure how to do.
            echo'
                     <tr>
                     <td id="'. $xml->doctype .'" name="'. $xml->doctype .'" class="mainTable">' . $xml->doctype . '</td>
                     <td><a href="viewdoc.php?docname=' . basename( $file, '.xml' ) . '&username='. $xml->startedby .'&myname='. $_SESSION['username'] .'">' . basename( $file, '.xml' ) . '</a></td>
                     <td><a href="viewprofile.php?name='. $xml->startedby .'">'. $xml->startedby .'</a></td>
                     <td>'. $xml->date .'</td>
                     <td>* * * * *</td>
                     <td>'. filesize( $file ) .'kb</td>
                    </tr>
               ';
        }
    }
?>

我有几个<a>标签（同一个链接，home.php），每个都有不同的$ _GET链接（ home.php？doctype = doc，home.php？doctype = all等。 ）。现在我希望使用if语句过滤每个doctype，如果他等于我的值，则检查$_GET['doctype']（假设值是word，excel，powerpoint等）。

我的问题是：如果我将$ xml-＆gt; doctype等同于我的某个值，我该如何过滤doctype？

Answer 1

我会使用位掩码： http://php.net/manual/en/language.operators.bitwise.php

<?php

// define your types and groups:
$listedTypes["TYPE_MSWORD"]             = 1;
$listedTypes["TYPE_MSEXCEL"]            = 2;
$listedTypes["TYPE_MSPOWERPOINT"]       = 4;
$listedTypes["TYPE_OFFICE"]             = $listedTypes["TYPE_MSWORD"] + $listedTypes["TYPE_MSEXCEL"] + $listedTypes["TYPE_MSPOWERPOINT"];

$listedTypes["TYPE_HTML"]               = 8;
$listedTypes["TYPE_SVG"]                = 16;
$listedTypes["TYPE_W3C"]                = $listedTypes["TYPE_HTML"] + $listedTypes["TYPE_SVG"];

$listedTypes["TYPE_ALL"]                = $listedTypes["TYPE_OFFICE"] + $listedTypes["TYPE_W3C"];


// try to open the page.php?doctype=TYPE_MSWORD
// or page.php?doctype=TYPE_ALL
if(!isset($_GET['doctype']))                        $_GET['doctype'] = "TYPE_ALL";
if(!isset($listedTypes[$_GET['doctype']]))          $_GET['doctype'] = "TYPE_ALL";
$requestedType = $listedTypes[$_GET['doctype']];



foreach ( $files as $file )
{
    $xml = new SimpleXMLElement( $file, 0, true );

    if($xml->doctype == "......")               $fileType = $listedTypes["TYPE_MSWORD"];
    elseif($xml->doctype == ".........")        $fileType = $listedTypes["TYPE_MSEXCEL"];
    elseif($xml->doctype == ".........")        $fileType = $listedTypes["TYPE_MSPOWERPOINT"];
    //... continue

    // then check if the $type matches the $selection of $_GET['doctype']
    // if the filetype is in the requested file type group, it will be shown
    if($fileType & $requestedType)
    {
        echo'
        <tr>
        <td id="'. $xml->doctype .'" name="'. $xml->doctype .'" class="mainTable">' . $xml->doctype . '</td>
        <td><a href="viewdoc.php?docname=' . basename( $file, '.xml' ) . '&username='. $xml->startedby .'&myname='. $_SESSION['username'] .'">' . basename( $file, '.xml' ) . '</a></td>
        <td><a href="viewprofile.php?name='. $xml->startedby .'">'. $xml->startedby .'</a></td>
        <td>'. $xml->date .'</td>
        <td>* * * * *</td>
        <td>'. filesize( $file ) .'kb</td>
        </tr>
        ';
    }
}

Answer 2

你的问题在于IF：

if ( isset( $_GET['doctype'] ) == "all" )

此语句将使用isset()'s评估true布尔结果false或string "all"，您可能并不意味着

要解决此问题并消除冗余，请使用以下代码：

$acceptedDocTypes = ['all', 'doc', 'excel'];

if ((isset($_GET['doctype'])) && (in_array($_GET['doctype'], $acceptedDocTypes))) {
    foreach ( $files as $file ) {
        $xml = new SimpleXMLElement( $file, 0, true );
        echo'
                <tr>
                <td id="'. $xml->doctype .'" name="'. $xml->doctype .'" class="mainTable">' . $xml->doctype . '</td>
                <td><a href="viewdoc.php?docname=' . basename( $file, '.xml' ) . '&username='. $xml->startedby .'&myname='. $_SESSION['username'] .'">' . basename( $file, '.xml' ) . '</a></td>
                <td><a href="viewprofile.php?name='. $xml->startedby .'">'. $xml->startedby .'</a></td>
                <td>'. $xml->date .'</td>
                <td>* * * * *</td>
                <td>'. filesize( $file ) .'kb</td>
                </tr>
                ';
    }
}

只要设置'doctype'并且属于允许的类型，此代码就会过滤。

按元素过滤XML

2 个答案: