Introduction to simplexml_load_string instance in php

Introduction to simplexml_load_string instance in php

This article describes how to use simplexml_load_string in php. For more information, see

Use a piece of code to reproduce the problem.

 

At first glance, the results are confusing:

 

The Code is as follows:

<? 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 );

?>

 

 

 

At first glance, the results are confusing:

 

The Code is as follows:

SimpleXMLElement Object

(

[Foo] => Array

(

[0] => SimpleXMLElement Object

(

[Bar] => hello

)

[1] => SimpleXMLElement Object

(

[Bar] => world

)

)

)

SimpleXMLElement Object

(

[Bar] => hello

)

 

 

Obviously, print_r shows that foo is an array with two bar elements, but only one bar element is displayed!

The reason is actually very simple. In the result of simplexml_load_string shown above, foo is not an array but an iteration object!

You can confirm as follows:

 

The Code is as follows:

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

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

 

 

It seems that the representation of print_r or var_dump is not completely credible. Please pay attention to it.

 

Assume that the obtained XML data is as follows: (you can use curl, fsockopen, etc)

 

 

The Code is as follows:

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

<Dict num = "219" id = "219" name = "219">

<Key> Hello </key>

<Pos> </pos>

<Acceptation> Array; </acceptation>

<Sent>

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

<Trans> the system disappeared several days ago. How are you? </Trans>

</Sent>

<Sent>

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

<Trans> Hey, how are you? </Trans>

</Sent>

<Sent>

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

<Trans> hello, Brooks! How are you? </Trans>

</Sent>

<Sent>

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

<Trans> Hey, Barbara, how are you? </Trans>

</Sent>

<Sent>

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

<Trans> how are you? -Good. Thank you. </Trans>

</Sent>

</Dict>

 

 

After simplexml_load_string:

The Code is as follows:

SimpleXMLElement Object

(

[@ Attributes] => Array

(

[Num] = & gt; 219

[Id] = & gt; 219

[Name] = & gt; 219

)

 

[Key] => hello

[Pos] => SimpleXMLElement Object

(

)

 

[Acceptation] => Array;

[Sent] => Array

(

[0] => SimpleXMLElement Object

(

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

[Trans] => it's been several days away. How are you?

)

 

[1] => SimpleXMLElement Object

(

[Orig] => Hello! How are you?

[Trans] => Hey, hello?

)

 

[2] => SimpleXMLElement Object

(

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

[Trans] => hello, Brooks! How are you?

)

 

[3] => SimpleXMLElement Object

(

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

[Trans] => Hey, Barbara, how are you?

)

 

[4] => SimpleXMLElement Object

(

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

[Trans] => how are you? -Good. Thank you.

)

 

)

 

)

 

 

 

We can use the following methods in PHP to obtain the desired value:

 

The Code is as follows:

<? Php

$ Data = <XML

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

<Dict num = "219" id = "219" name = "219">

<Key> Hello </key>

<Pos> </pos>

<Acceptation> Array; </acceptation>

<Sent>

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

<Trans> the system disappeared several days ago. How are you? </Trans>

</Sent>

<Sent>

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

<Trans> Hey, how are you? </Trans>

</Sent>

<Sent>

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

<Trans> hello, Brooks! How are you? </Trans>

</Sent>

<Sent>

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

<Trans> Hey, Barbara, how are you? </Trans>

</Sent>

<Sent>

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

<Trans> how are you? -Good. Thank you. </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); // hello

?>