php if else 语句不回显 else

Question

如果没有回显“noname”，则如果存在 xmllang="no"，我将尝试回显挪威语。喜欢

000000000121698001,

文本 000000000121699001，无名

但这只会返回所有具有 xmllang="no" 的 productid，而不是打印没有 xmllang="no" 的 productId

XML

<catalog>
<product productid="000000000121698001">
    <displayname xmllang="da">text</displayname>
    <displayname xmllang="fi">text</displayname>
    <displayname xmllang="no">text</displayname>
    <displayname xmllang="sv">text</displayname>    
</product>

<product productid="000000000121699001">
    <displayname xmllang="da">test</displayname>
    <displayname xmllang="x-default">test</displayname>
    <displayname xmllang="sv">test</displayname>
</product>

PHP

foreach ($xml->product as $product) {

    foreach ($product->displayname as $name) {
        switch((string) $name['xmllang']) {
            case 'no':

                echo $product->attributes()->productid. ",";

                if (isset($name)){
                    echo $name. ",", PHP_EOL;
                } else {
                    echo 'noname ,';
                }
                echo "<br>\n";
        }
    }
}

Answer 1

我会将其分为两部分：第一，准备数据并找到正确的本地化标签或设置默认值；然后第二次以任何格式输出数据（或理想情况下将$idList 传递给模板）。

<?php
/** @var SimpleXMLElement $xml */

$idList = [];

/* Prepare the data */
foreach ($xml->product as $product) {
    $fallbackLabel = null;

    /* Iterate over the display names */
    foreach ($product->displayname as $name) {
        /* And search for the one in a matching language */
        switch ((string)$name['xmllang']) {
            case 'no':
                $idList[$product->attributes()->productid] = $name;
                break;
            case 'x-default':
                $fallbackLabel = $name;
                break;
        }
    }

    /* If no name in the searched language was found, set a fallback here */
    if (!isset($idList[$product->attributes()->productid])) {
        if (!empty($fallbackLabel)) {
            /* If a label with a language code of "x-default" was found, use that as fallback label */
            $idList[$product->attributes()->productid] = $fallbackLabel;
        } else {
            /* …if not set a static text */
            $idList[$product->attributes()->productid] = 'noname';
        }
    }
}

/* Output the data */
foreach ($idList as $id => $label) {
    echo sprintf("%s,%s<br>\n", $id, $label);
}