How to delete a certain piece of xml data in PHP

PHP method to delete and modify xml data

##example.xml

Traverse the xml document

load('example.xml');

    $books = $doc -> getElementsByTagName("book");
    //遍历
    foreach ($books as $book) {
        echo $book->getAttribute('id')."-";
        echo $book->getElementsByTagName("title")->item(0)->nodeValue;
        echo "
";
    }

The running result is:

1-title1
2-title2
3-title3
4-title4
5-title5

Modified:

load('example.xml');

    $books = $doc -> getElementsByTagName("book");
    //遍历
    foreach ($books as $book) {
        //将id=3的title设置为33333
        if($book->getAttribute('id')==3){
            echo $book->getAttribute('id')."-";
            echo $book->getElementsByTagName("title")->item(0)->nodeValue="33333";
            echo "
";
        }
    }
    //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件
    $doc -> save('example.xml');

After modified:

Deleted:

load('example.xml');

    $root = $doc -> documentElement;//根标签   
    $books = $doc -> getElementsByTagName("book");
    //遍历
    foreach ($books as $book) {
        //将id=4的删除
        if($book->getAttribute('id')==4){
            $root->removeChild($book);
        }
    }
    //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件
    $doc -> save('example.xml');

After deletion:

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