PHP DOM操作xml文档，删除一个，遍历删除所有(注意有陷阱)

dom_delete1.php（删除一个）:

<?php //[需求1]：删除第二本书的year节点 $dom = new DOMDocument('1.0','utf-8'); $dom->load('bookstore.xml'); //找到第二本书的year元素 $year = $dom->getElementsByTagName('year')->item(1); $year->parentNode->removeChild($year); //通过父结点来删除 $dom->save('dom_delete1_book.xml'); dom_delete2.php（循环遍历删除所有，注意有陷阱(删除会导致更新文档，不能一边遍历一边删除)）: <?php //[需求1]：删除所有书籍的year节点 $dom = new DOMDocument('1.0','utf-8'); $dom->load('bookstore1.xml'); //找到所有书的year元素 $years = $dom->getElementsByTagName('year'); //循环删除 /*一边遍历一边删除会出错(隔行删除)。原因：删除的时候会导致更新整个文档，然后继续遍历的时候就会出错。 foreach ($years as $year) { //读取year节点下的子节点值做相应判断 $source = $year->getElementsByTagName("source")->item(0)->nodeValue; //读取节点值,source $translations = $year->getElementsByTagName("translation")->item(0)->attributes->item(0)->nodeValue; //节点属性值 type $translation = $year->getElementsByTagName("translation")->item(0)->nodeValue;// 读取节点值,translation if($source ==XXXXXX) { $temp[] = $year; //删除后更新文档，并不会影响temp[]。 } }*/ //先遍历 保存。(不能一边遍历一边删除) $temp = array(); foreach ($years as $year) { //读取year节点下的子节点值做相应判断 $source = $year->getElementsByTagName("source")->item(0)->nodeValue; //读取节点值,source $translations = $year->getElementsByTagName("translation")->item(0)->attributes->item(0)->nodeValue; //节点属性值 type $translation = $year->getElementsByTagName("translation")->item(0)->nodeValue;// 读取节点值,translation if($source ==XXXXXX) { $temp[] = $year; //删除后更新文档，并不会影响temp[]。 } } //再循环删除 foreach ($temp as $v) { $v->parentNode->removeChild($v); } $dom->save('dom_delete2_book.xml'); Giada De Laurentiis 30.00 J K. Rowling 29.99 Erik T. Ray 39.95 Giada De Laurentiis 30.00