PHP XML Library：一个不错的PHP XML操作类_PHP_编程开发_程序员俱乐部

　　今天在PHP4环境下重新写一个接口程序，需要大量分析解析XML，PHP的xml_parse_into_struct()函数不能直接生成便于使用的数组，而SimpleXML扩展在PHP5中才支持，于是逛逛搜索引擎，在老外的网站上找到了一个不错的PHP XML操作类。

一、用法举例：
1、将XML文件解释成便于使用的数组：

1. <?php ??
2. include('xml.php');????//引用PHP?XML操作类 ??
3. $xml?=?file_get_contents('data.xml');????//读取XML文件 ??
4. //$xml?=?file_get_contents("php://input");????//读取POST过来的输入流 ??
5. $data=XML_unserialize($xml); ??
6. echo?'<pre>'; ??
7. print_r($data); ??
8. echo?'</pre>'; ??
9. ?>??

<?php include('xml.php'); ? ?//引用PHP XML操作类 $xml = file_get_contents('data.xml'); ? ?//读取XML文件 //$xml = file_get_contents("php://input"); ? ?//读取POST过来的输入流 $data=XML_unserialize($xml); echo '<pre>'; print_r($data); echo '</pre>'; ?>

data.xml文件：

1. <?xml?version="1.0"?encoding="GBK"?>??
2. <video>??
3. <upload>??
4. <videoid>998</videoid>??
5. <name><![CDATA[回忆未来]]></name>??
6. <memo><![CDATA[def]]></memo>??
7. <up_userid>11317</up_userid>??
8. </upload>??
9. </video>??

<?xml version="1.0" encoding="GBK"?> <video> <upload> <videoid>998</videoid> <name><![CDATA[回忆未来]]></name> <memo><![CDATA[def]]></memo> <up_userid>11317</up_userid> </upload> </video>

利用该XML操作类生成的对应数组（汉字编码：UTF-8）：

1. Array ??
2. ( ??
3. ????[video]?=>?Array ??
4. ????????( ??
5. ????????????[upload]?=>?Array ??
6. ????????????????( ??
7. ????????????????????[videoid]?=>?998 ??
8. ????????????????????[name]?=>?回忆未来 ??
9. ????????????????????[memo]?=>?def ??
10. ????????????????????[up_userid]?=>?11317 ??
11. ????????????????) ??
12. ??
13. ????????) ??
14. ??
15. )??

Array ( ? ?[video] => Array ? ? ? ?( ? ? ? ? ? ?[upload] => Array ? ? ? ? ? ? ? ?( ? ? ? ? ? ? ? ? ? ?[videoid] => 998 ? ? ? ? ? ? ? ? ? ?[name] => 回忆未来 ? ? ? ? ? ? ? ? ? ?[memo] => def ? ? ? ? ? ? ? ? ? ?[up_userid] => 11317 ? ? ? ? ? ? ? ?) ? ? ? ?) )

2、将数组转换成XML文件：

1. <?php ??
2. include('xml.php');//引用PHP?XML操作类 ??
3. $xml?=?XML_serialize($data); ??
4. ?>??

<?php include('xml.php');//引用PHP XML操作类 $xml = XML_serialize($data); ?>

二、PHP XML操作类源代码：

1. <?php? ??
2. ###################################################################################? ??
3. #? ??
4. #?XML?Library,?by?Keith?Devens,?version?1.2b? ??
5. #?<a?href="http://keithdevens.com/software/phpxml"?target="_blank">http://keithdevens.com/software/phpxml</a>? ??
6. #? ??
7. #?This?code?is?Open?Source,?released?under?terms?similar?to?the?Artistic?License.? ??
8. #?Read?the?license?at?<a?href="http://keithdevens.com/software/license"?target="_blank">http://keithdevens.com/software/license</a>? ??
9. #? ??
10. ###################################################################################? ??
11. ??
12. ###################################################################################? ??
13. #?XML_unserialize:?takes?raw?XML?as?a?parameter?(a?string)? ??
14. #?and?returns?an?equivalent?PHP?data?structure? ??
15. ###################################################################################? ??
16. function?&?XML_unserialize(&$xml){? ??
17. ????$xml_parser?=?&new?XML();? ??
18. ????$data?=?&$xml_parser->parse($xml);? ??
19. ????$xml_parser->destruct();? ??
20. ????return?$data;? ??
21. }? ??
22. ###################################################################################? ??
23. #?XML_serialize:?serializes?any?PHP?data?structure?into?XML? ??
24. #?Takes?one?parameter:?the?data?to?serialize.?Must?be?an?array.? ??
25. ###################################################################################? ??
26. function?&?XML_serialize(&$data,?$level?=?0,?$prior_key?=?NULL){? ??
27. ????if($level?==?0){?ob_start();?echo?'<?xml?version="1.0"??>',"\n";?}? ??
28. ????while(list($key,?$value)?=?each($data))? ??
29. ????????if(!strpos($key,?'?attr'))?#if?it's?not?an?attribute? ?
30. ????????????#we?don't?treat?attributes?by?themselves,?so?for?an?emptyempty?element? ??
31. ????????????#?that?has?attributes?you?still?need?to?set?the?element?to?NULL? ??
32. ??
33. ????????????if(is_array($value)?and?array_key_exists(0,?$value)){? ??
34. ????????????????XML_serialize($value,?$level,?$key);? ??
35. ????????????}else{? ??
36. ????????????????$tag?=?$prior_key???$prior_key?:?$key;? ??
37. ????????????????echo?str_repeat("\t",?$level),'<',$tag;? ??
38. ????????????????if(array_key_exists("$key?attr",?$data)){?#if?there's?an?attribute?for?this?element? ?
39. ????????????????????while(list($attr_name,?$attr_value)?=?each($data["$key?attr"]))? ?
40. ????????????????????????echo?'?',$attr_name,'="',htmlspecialchars($attr_value),'"';? ?
41. ????????????????????reset($data["$key?attr"]);? ?
42. ????????????????}? ?
43. ?
44. ????????????????if(is_null($value))?echo?"?/>\n";? ?
45. ????????????????elseif(!is_array($value))?echo?'>',htmlspecialchars($value),"</$tag>\n";? ?
46. ????????????????else?echo?">\n",XML_serialize($value,?$level+1),str_repeat("\t",?$level),"</$tag>\n";? ?
47. ????????????}? ?
48. ????reset($data);? ?
49. ????if($level?==?0){?$str?=?&ob_get_contents();?ob_end_clean();?return?$str;?}? ?
50. }? ?
51. ###################################################################################? ?
52. #?XML?class:?utility?class?to?be?used?with?PHP's?XML?handling?functions? ??
53. ###################################################################################? ??
54. class?XML{? ??
55. ????var?$parser;???#a?reference?to?the?XML?parser? ??
56. ????var?$document;?#the?entire?XML?structure?built?up?so?far? ??
57. ????var?$parent;???#a?pointer?to?the?current?parent?-?the?parent?will?be?an?array? ??
58. ????var?$stack;????#a?stack?of?the?most?recent?parent?at?each?nesting?level? ??
59. ????var?$last_opened_tag;?#keeps?track?of?the?last?tag?opened.? ??
60. ??
61. ????function?XML(){? ??
62. ?????????$this->parser?=?&xml_parser_create();? ??
63. ????????xml_parser_set_option(&$this->parser,?XML_OPTION_CASE_FOLDING,?false);? ??
64. ????????xml_set_object(&$this->parser,?&$this);? ??
65. ????????xml_set_element_handler(&$this->parser,?'open','close');? ??
66. ????????xml_set_character_data_handler(&$this->parser,?'data');? ??
67. ????}? ??
68. ????function?destruct(){?xml_parser_free(&$this->parser);?}? ??
69. ????function?&?parse(&$data){? ??
70. ????????$this->document?=?array();? ??
71. ????????$this->stack????=?array();? ??
72. ????????$this->parent???=?&$this->document;? ??
73. ????????return?xml_parse(&$this->parser,?&$data,?true)???$this->document?:?NULL;? ??
74. ????}? ??
75. ????function?open(&$parser,?$tag,?$attributes){? ??
76. ????????$this->data?=?'';?#stores?temporary?cdata? ??
77. ????????$this->last_opened_tag?=?$tag;? ??
78. ????????if(is_array($this->parent)?and?array_key_exists($tag,$this->parent)){?#if?you've?seen?this?tag?before? ?
79. ????????????if(is_array($this->parent[$tag])?and?array_key_exists(0,$this->parent[$tag])){?#if?the?keys?are?numeric? ?
80. ????????????????#this?is?the?third?or?later?instance?of?$tag?we've?come?across? ??
81. ????????????????$key?=?count_numeric_items($this->parent[$tag]);? ??
82. ????????????}else{? ??
83. ????????????????#this?is?the?second?instance?of?$tag?that?we've?seen.?shift?around? ?
84. ????????????????if(array_key_exists("$tag?attr",$this->parent)){? ?
85. ????????????????????$arr?=?array('0?attr'=>&$this->parent["$tag?attr"],?&$this->parent[$tag]);? ?
86. ????????????????????unset($this->parent["$tag?attr"]);? ?
87. ????????????????}else{? ?
88. ????????????????????$arr?=?array(&$this->parent[$tag]);? ?
89. ????????????????}? ?
90. ????????????????$this->parent[$tag]?=?&$arr;? ?
91. ????????????????$key?=?1;? ?
92. ????????????}? ?
93. ????????????$this->parent?=?&$this->parent[$tag];? ?
94. ????????}else{? ?
95. ????????????$key?=?$tag;? ?
96. ????????}? ?
97. ????????if($attributes)?$this->parent["$key?attr"]?=?$attributes;? ?
98. ????????$this->parent??=?&$this->parent[$key];? ?
99. ????????$this->stack[]?=?&$this->parent;? ?
100. ????}? ?
101. ????function?data(&$parser,?$data){? ?
102. ????????if($this->last_opened_tag?!=?NULL)?#you?don't?need?to?store?whitespace?in?between?tags? ??
103. ????????????$this->data?.=?$data;? ??
104. ????}? ??
105. ????function?close(&$parser,?$tag){? ??
106. ????????if($this->last_opened_tag?==?$tag){? ??
107. ????????????$this->parent?=?$this->data;? ??
108. ????????????$this->last_opened_tag?=?NULL;? ??
109. ????????}? ??
110. ????????array_pop($this->stack);? ??
111. ????????if($this->stack)?$this->parent?=?&$this->stack[count($this->stack)-1];? ??
112. ????}? ??
113. }? ??
114. function?count_numeric_items(&$array){? ??
115. ????return?is_array($array)???count(array_filter(array_keys($array),?'is_numeric'))?:?0;? ??
116. }? ??
117. ?>? ??

<?php ################################################################################### # # XML Library, by Keith Devens, version 1.2b # <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a> # # This code is Open Source, released under terms similar to the Artistic License. # Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a> # ################################################################################### ################################################################################### # XML_unserialize: takes raw XML as a parameter (a string) # and returns an equivalent PHP data structure ################################################################################### function & XML_unserialize(&$xml){ ? ?$xml_parser = &new XML(); ? ?$data = &$xml_parser->parse($xml); ? ?$xml_parser->destruct(); ? ?return $data; } ################################################################################### # XML_serialize: serializes any PHP data structure into XML # Takes one parameter: the data to serialize. Must be an array. ################################################################################### function & XML_serialize(&$data, $level = 0, $prior_key = NULL){ ? ?if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; } ? ?while(list($key, $value) = each($data)) ? ? ? ?if(!strpos($key, ' attr')) #if it's not an attribute ? ? ? ? ? ?#we don't treat attributes by themselves, so for an empty element ? ? ? ? ? ?# that has attributes you still need to set the element to NULL ? ? ? ? ? ?if(is_array($value) and array_key_exists(0, $value)){ ? ? ? ? ? ? ? ?XML_serialize($value, $level, $key); ? ? ? ? ? ?}else{ ? ? ? ? ? ? ? ?$tag = $prior_key ? $prior_key : $key; ? ? ? ? ? ? ? ?echo str_repeat("\t", $level),'<',$tag; ? ? ? ? ? ? ? ?if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element ? ? ? ? ? ? ? ? ? ?while(list($attr_name, $attr_value) = each($data["$key attr"])) ? ? ? ? ? ? ? ? ? ? ? ?echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"'; ? ? ? ? ? ? ? ? ? ?reset($data["$key attr"]); ? ? ? ? ? ? ? ?} ? ? ? ? ? ? ? ?if(is_null($value)) echo " />\n"; ? ? ? ? ? ? ? ?elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n"; ? ? ? ? ? ? ? ?else echo ">\n",XML_serialize($value, $level+1),str_repeat("\t", $level),"</$tag>\n"; ? ? ? ? ? ?} ? ?reset($data); ? ?if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; } } ################################################################################### # XML class: utility class to be used with PHP's XML handling functions ################################################################################### class XML{ ? ?var $parser; ? #a reference to the XML parser ? ?var $document; #the entire XML structure built up so far ? ?var $parent; ? #a pointer to the current parent - the parent will be an array ? ?var $stack; ? ?#a stack of the most recent parent at each nesting level ? ?var $last_opened_tag; #keeps track of the last tag opened. ? ?function XML(){ ? ? ? ? $this->parser = &xml_parser_create(); ? ? ? ?xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false); ? ? ? ?xml_set_object(&$this->parser, &$this); ? ? ? ?xml_set_element_handler(&$this->parser, 'open','close'); ? ? ? ?xml_set_character_data_handler(&$this->parser, 'data'); ? ?} ? ?function destruct(){ xml_parser_free(&$this->parser); } ? ?function & parse(&$data){ ? ? ? ?$this->document = array(); ? ? ? ?$this->stack ? ?= array(); ? ? ? ?$this->parent ? = &$this->document; ? ? ? ?return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL; ? ?} ? ?function open(&$parser, $tag, $attributes){ ? ? ? ?$this->data = ''; #stores temporary cdata ? ? ? ?$this->last_opened_tag = $tag; ? ? ? ?if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before ? ? ? ? ? ?if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric ? ? ? ? ? ? ? ?#this is the third or later instance of $tag we've come across ? ? ? ? ? ? ? ?$key = count_numeric_items($this->parent[$tag]); ? ? ? ? ? ?}else{ ? ? ? ? ? ? ? ?#this is the second instance of $tag that we've seen. shift around ? ? ? ? ? ? ? ?if(array_key_exists("$tag attr",$this->parent)){ ? ? ? ? ? ? ? ? ? ?$arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]); ? ? ? ? ? ? ? ? ? ?unset($this->parent["$tag attr"]); ? ? ? ? ? ? ? ?}else{ ? ? ? ? ? ? ? ? ? ?$arr = array(&$this->parent[$tag]); ? ? ? ? ? ? ? ?} ? ? ? ? ? ? ? ?$this->parent[$tag] = &$arr; ? ? ? ? ? ? ? ?$key = 1; ? ? ? ? ? ?} ? ? ? ? ? ?$this->parent = &$this->parent[$tag]; ? ? ? ?}else{ ? ? ? ? ? ?$key = $tag; ? ? ? ?} ? ? ? ?if($attributes) $this->parent["$key attr"] = $attributes; ? ? ? ?$this->parent ?= &$this->parent[$key]; ? ? ? ?$this->stack[] = &$this->parent; ? ?} ? ?function data(&$parser, $data){ ? ? ? ?if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags ? ? ? ? ? ?$this->data .= $data; ? ?} ? ?function close(&$parser, $tag){ ? ? ? ?if($this->last_opened_tag == $tag){ ? ? ? ? ? ?$this->parent = $this->data; ? ? ? ? ? ?$this->last_opened_tag = NULL; ? ? ? ?} ? ? ? ?array_pop($this->stack); ? ? ? ?if($this->stack) $this->parent = &$this->stack[count($this->stack)-1]; ? ?} } function count_numeric_items(&$array){ ? ?return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0; } ?>

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