php中simplexml_load_string使用实例介绍

php中simplexml_load_string使用实例介绍

这篇文章主要介绍了php中simplexml_load_string使用实例,需要的朋友可以参考下

先用一段代码重现一下问题

乍一看,结果很让人费解:

代码如下:

<?php

$string = <<<EOF

<data>

<foo><bar>hello</bar></foo>

<foo><bar>world</bar></foo>

</data>

EOF;

$data = simplexml_load_string($string);

print_r($data);

print_r($data->foo);

?>

乍一看,结果很让人费解:

代码如下:

SimpleXMLElement Object

(

[foo] => Array

(

[0] => SimpleXMLElement Object

(

[bar] => hello

)

[1] => SimpleXMLElement Object

(

[bar] => world

)

)

)

SimpleXMLElement Object

(

[bar] => hello

)

明明print_r显示foo是一个有两个bar元素的数组,但是最后却仅仅显示了一个bar元素!

原因其实很简单,在如上所示simplexml_load_string的结果里,foo并不是数组,而是一个迭代对象!

可以这样确认:

代码如下:

foreach ($data->foo as $v) print_r($v);

foreach ($data->children() as $v) print_r($v);

看来,print_r或者var_dump之类的表象并不完全可信,自己多留心吧。

假如我们获取的XML数据如下:(可以使用curl、fsockopen等方式获取)

代码如下:

<?xml version="1.0" encoding="UTF-8"?>

<dict num="219" name="219">

<key>你好</key>

<pos></pos>

<acceptation>Array;Array;Array;</acceptation>

<sent>

<orig>Haven't seen you for a long time. How are you?</orig>

<trans>多日不见了,你好吗?</trans>

</sent>

<sent>

<orig>Hello! How are you?</orig>

<trans>嘿,你好?</trans>

</sent>

<sent>

<orig>Hello, Brooks!How are you?</orig>

<trans>喂,布鲁克斯!你好吗?</trans>

</sent>

<sent>

<orig>Hi, Barbara, how are you?</orig>

<trans>嘿,芭芭拉,你好吗?</trans>

</sent>

<sent>

<orig>How are you? -Quite well, thank you.</orig>

<trans>你好吗?-很好,谢谢你。</trans>

</sent>

</dict>

经过simplexml_load_string得到:

代码如下:

SimpleXMLElement Object

(

[@attributes] => Array

(

[num] => 219

[id] => 219

[name] => 219

)

[key] => 你好

[pos] => SimpleXMLElement Object

(

)

[acceptation] => Array;Array;Array;

[sent] => Array

(

[0] => SimpleXMLElement Object

(

[orig] => Haven't seen you for a long time. How are you?

[trans] => 多日不见了,你好吗?

)

[1] => SimpleXMLElement Object

(

[orig] => Hello! How are you?

[trans] => 嘿,你好?

)

[2] => SimpleXMLElement Object

(

[orig] => Hello, Brooks!How are you?

[trans] => 喂,布鲁克斯!你好吗?

)

[3] => SimpleXMLElement Object

(

[orig] => Hi, Barbara, how are you?

[trans] => 嘿,芭芭拉,你好吗?

)

[4] => SimpleXMLElement Object

(

[orig] => How are you? -Quite well, thank you.

[trans] => 你好吗?-很好,谢谢你。

)

)

)

我们在PHP语言中可以用以下方法取得我们想要的值:

码 代码如下:

<?php

$data = <<<XML

<?xml version="1.0" encoding="UTF-8"?>

<dict num="219" name="219">

<key>你好</key>

<pos></pos>

<acceptation>Array;Array;Array;</acceptation>

<sent>

<orig>Haven't seen you for a long time. How are you?</orig>

<trans>多日不见了,你好吗?</trans>

</sent>

<sent>

<orig>Hello! How are you?</orig>

<trans>嘿,你好?</trans>

</sent>

<sent>

<orig>Hello, Brooks!How are you?</orig>

<trans>喂,布鲁克斯!你好吗?</trans>

</sent>

<sent>

<orig>Hi, Barbara, how are you?</orig>

<trans>嘿,芭芭拉,你好吗?</trans>

</sent>

<sent>

<orig>How are you? -Quite well, thank you.</orig>

<trans>你好吗?-很好,谢谢你。</trans>

</sent>

</dict>

XML;

$xmldata = simplexml_load_string($data);

header("Content-Type: text/html; charset=UTF-8");

print_r($xmldata);

echo "<br />".trim($xmldata->sent[0]->orig); //Haven't seen you for a long time. How are you?

echo "<br />".trim($xmldata->key); //你好

?>