有人帮忙看看嘛。关于用PHP修改XML文件的

[z85361199]

<?xml version="1.0" encoding="utf-8"?>
<Map>
<Monsters>
<Monster ID="100" Code="-1" PicCode="-1" ResName="Monster_001.unity3d" YouShou="" ZuoShou="" Scale="0.4" ShaderID="" GuaJieDian="" GuaJieTeXiao="" Sex="0" Function="" SName="蜘蛛" MapCode="1" Talk="变大的感觉真好！" Talk2="进攻勇者大陆……" NameColor="1" ZhuanSheng="0" Level="1" AttackType="0" MinAttackPercent="28" MaxAttackPercent="35" DefensePercent="1" MDefensePercent="1" Dodge="20" HitV="20" MaxLife="166" MaxMagic="1000" RecoverLifeV="0.005" RecoverMagicV="0" DamageThornPercent="0" DamageThorn="0" SubAttackInjurePercent="0" SubAttackInjure="0" IgnoreDefensePercent="0" IgnoreDefenseRate="0" Lucky="0" FatalAttack="0" DoubleAttack="0" HolyAttack="0" HolyDefense="0" HolyWeakPercent="0" ShadowAttack="0" ShadowDefense="0" ShadowWeakPercent="0" NatureAttack="0" NatureDefense="0" NatureWeakPercent="0" ChaosAttack="0" ChaosDefense="0" ChaosWeakPercent="0" IncubusAttack="0" IncubusDefense="0" IncubusWeakPercent="0" Experience="38" RebornExp="0" AttackRange="150" SeedRange="0" FallID="101" MonsterType="101" XueTiaoType="1,-1" MonsterSpeed="1" AttackSpeed="1" MovePace="1" MoveWaitTime="0" Display="1" PersonalJiFen="" CampJiFen="" EMoJiFen="" XueSeJiFen="" JinBiJiFen="" LangHunJiFen="" Belong="1" AIID="" SkillIDs="" TuoZhan="" ComeAnimation="" DieAnimation="" Camp="0" PlaySound="zhizhu.mp3" AttackSound="zhizhuattack.mp3" HitSound="" DieSound="zhizhudie.mp3" Collide="" />

</Monsters>
</Map>

这个是XML文件

<?php

$doc = new DOMDocument();
$doc->load('Monsters1.xml');

$books = $doc ->documentElement-> getElementsByTagName("Monster");
foreach ($books as $Experience){
if( $value->getAttribute("ID")=="100"){
$value->setAttribute("Experience",10000);
}
}
这个是我写的PHP 为啥会报错啊

[z85361199]

Notice: Undefined variable: value in D:\myphp_www\PHPTutorial\WWW\sxe_update.php on line 8

Fatal error: Uncaught Error: Call to a member function getAttribute() on null in D:\myphp_www\PHPTutorial\WWW\sxe_update.php:8 Stack trace: #0 {main} thrown in D:\myphp_www\PHPTutorial\WWW\sxe_update.php on line 8

这个是错误码

[床上等您]

foreach ($books as $Experience){
if( $value->getAttribute("ID")=="100"){
$value->setAttribute("Experience",10000);  // 这里$value写错了吧？应该是$Experience
}
}