dongyan1936 2019-04-18 17:12
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使用Xpath进行部分匹配

I'm trying to create a search function allowing partial matching by song title or genre using Xpath.

This is my XML file:

<?xml version="1.0" encoding="UTF-8"?>
<playlist>
  <item>
    <songid>USAT29902236</songid>
    <songtitle>I Say a Little Prayer</songtitle>
    <artist>Aretha Franklin</artist>
    <genre>Soul</genre>
    <link>https://www.amazon.com/I-Say-a-Little-Prayer/dp/B001BZD6KO</link>
    <releaseyear>1968</releaseyear>
  </item>
  <item>
    <songid>GBAAM8300001</songid>
    <songtitle>Every Breath You Take</songtitle>
    <artist>The Police</artist>
    <genre>Pop/Rock</genre>
    <link>https://www.amazon.com/Every-Breath-You-Take-Police/dp/B000008JI6</link>
    <releaseyear>1983</releaseyear>
  </item>
  <item>
    <songid>GBBBN7902002</songid>
    <songtitle>London Calling</songtitle>
    <artist>The Clash</artist>
    <genre>Post-punk</genre>
    <link>https://www.amazon.com/London-Calling-Remastered/dp/B00EQRJNTM</link>
    <releaseyear>1979</releaseyear>
  </item>
</playlist>

and this is my search function so far:

function searchSong($words){
    global $xml;

    if(!empty($words)){
        foreach($words as $word){
            //$query = "//playlist/item[contains(songtitle/genre, '{$word}')]";
            $query = "//playlist/item[(songtitle[contains('{$word}')]) and (genre[contains('{$word}')])]";
            $result = $xml->xpath($query);
        }
    }

    print_r($result);
}

Calling the function searchSong(array("take", "soul")) should return the second and first song from XML file, but the array is always empty.

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2条回答 默认 最新

  • dpp34603 2019-04-18 17:33
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    A few errors here: use of and instead of or, assuming searches are case-insensitive, and passing incorrect number of parameters to contains. The last would have triggered PHP warnings if you were looking for them. Also, you're only ever returning the last item you search for.

    Case insensitive searches in XPath 1.0 (which is all PHP supports) are a huge pain to do:

    $result = $xml->query(
        "//playlist/item[(songtitle[contains(translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), '{$word}')]) or (genre[contains(translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), '{$word}')])]"
    );
    

    This assumes you've taken your search terms and converted them to lower-case already. For example:

    <?php
    
    function searchSong($xpath, ...$words)
    {
        $return = [];
        foreach($words as $word) {
            $word = strtolower($word);
            $q = "//playlist/item[(songtitle[contains(translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), '{$word}')]) or (genre[contains(translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), '{$word}')])]";
            $result = $xpath->query($q);
            foreach($result as $node) {
                $return[] = $node;
            }
        }
        return $return;
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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