XML 很容易自己解析，无论如何这里存在xml_parse在 php 4 和domxml_open_file
这是php4 的 json和另一个
根据解析xml：
如果你知道 xml 文件的结构，你甚至可以使用 RegExp，因为 XML 是严格格式（我的意思是所有标签都必须关闭，所有属性都用引号括起来，所有特殊符号总是转义）
如果您解析任意 xml 文件，这里是学生示例，它适用于 php4，不了解所有 XML 功能，但可以给您“蛮力”之类的想法：
<?php
define("LWG_XML_ELEMENT_NULL", "0");
define("LWG_XML_ELEMENT_NODE", "1");
function EntitiesToString($str)
{
$s = $str;
$s = eregi_replace(""", "\"", $s);
$s = eregi_replace("<", "<", $s);
$s = eregi_replace(">", ">", $s);
$s = eregi_replace("&", "&", $s);
return $s;
}
class CLWG_dom_attribute
{
var $name;
var $value;
function CLWG_dom_attribute()
{
$name = "";
$value = "";
}
}
class CLWG_dom_node
{
var $m_Attributes;
var $m_Childs;
var $m_nAttributesCount;
var $m_nChildsCount;
var $type;
var $tagname;
var $content;
function CLWG_dom_node()
{
$this->m_Attributes = array();
$this->m_Childs = array();
$this->m_nAttributesCount = 0;
$this->m_nChildsCount = 0;
$this->type = LWG_XML_ELEMENT_NULL;
$this->tagname = "";
$this->content = "";
}
function get_attribute($attr_name)
{
//echo "<message>Get Attribute: ".$attr_name." ";
for ($i=0; $i<sizeof($this->m_Attributes); $i++)
if ($this->m_Attributes[$i]->name == $attr_name)
{
//echo $this->m_Attributes[$i]->value . "</message>\n";
return $this->m_Attributes[$i]->value;
}
//echo "[empty]</message>\n";
return "";
}
function get_content()
{
//echo "<message>Get Content: ".$this->content . "</message>\n";
return $this->content;
}
function attributes()
{
return $this->m_Attributes;
}
function child_nodes()
{
return $this->m_Childs;
}
function loadXML($str, &$i)
{
//echo "<debug>DEBUG: LoadXML (".$i.": ".$str[$i].")</debug>\n";
$str_len = strlen($str);
//echo "<debug>DEBUG: start searching for tag (".$i.": ".$str[$i].")</debug>\n";
while ( ($i<$str_len) && ($str[$i] != "<") )
$i++;
if ($i == $str_len) return FALSE;
$i++;
while ( ($i<strlen($str)) && ($str[$i] != " ") && ($str[$i] != "/") && ($str[$i] != ">") )
$this->tagname .= $str[$i++];
//echo "<debug>DEBUG: Tag: " . $this->tagname . "</debug>\n";
if ($i == $str_len) return FALSE;
switch ($str[$i])
{
case " ": // attributes comming
{
//echo "<debug>DEBUG: Tag: start searching attributes</debug>\n";
$i++;
$cnt = sizeof($this->m_Attributes);
while ( ($i<strlen($str)) && ($str[$i] != "/") && ($str[$i] != ">") )
{
$this->m_Attributes[$cnt] = new CLWG_dom_attribute;
while ( ($i<strlen($str)) && ($str[$i] != "=") )
$this->m_Attributes[$cnt]->name .= $str[$i++];
if ($i == $str_len) return FALSE;
$i++;
while ( ($i<strlen($str)) && ($str[$i] != "\"") )
$i++;
if ($i == $str_len) return FALSE;
$i++;
while ( ($i<strlen($str)) && ($str[$i] != "\"") )
$this->m_Attributes[$cnt]->value .= $str[$i++];
$this->m_Attributes[$cnt]->value = EntitiesToString($this->m_Attributes[$cnt]->value);
//echo "<debug>DEBUG: Tag: Attribute: '".$this->m_Attributes[$cnt]->name."' = '".$this->m_Attributes[$cnt]->value."'</debug>\n";
if ($i == $str_len) return FALSE;
$i++;
if ($i == $str_len) return FALSE;
while ( ($i<strlen($str)) && ($str[$i] == " ") )
$i++;
$cnt++;
}
if ($i == $str_len) return FALSE;
switch ($str[$i])
{
case "/":
{
//echo "<debug>DEBUG: self closing tag with attributes (".$this->tagname.")</debug>\n";
$i++;
if ($i == $str_len) return FALSE;
if ($str[$i] != ">") return FALSE;
$i++;
return TRUE;
break;
}
case ">";
{
//echo "<debug>DEBUG: end of attributes (".$this->tagname.")</debug>\n";
$i++;
break;
}
}
break;
}
case "/": // self closing tag
{
//echo "<debug>DEBUG: self closing tag (".$this->tagname.")</debug>\n";
$i++;
if ($i == $str_len) return FALSE;
if ($str[$i] != ">") return FALSE;
$i++;
return TRUE;
break;
}
case ">": // end of begin of node
{
//echo "<debug>DEBUG: end of begin of node</debug>\n";
$i++;
break;
}
}
if ($i == $str_len) return FALSE;
$b = 1;
while ( ($i<$str_len) && ($b) )
{
//echo "<debug>DEBUG: searching for content</debug>\n";
while ( ($i<strlen($str)) && ($str[$i] != "<") )
$this->content .= $str[$i++];
//echo "<debug>DEBUG: content: ".$this->content."</debug>\n";
if ($i == $str_len) return FALSE;
$i++;
if ($i == $str_len) return FALSE;
if ($str[$i] != "/") // new child
{
$cnt = sizeof($this->m_Childs);
//echo "<debug>DEBUG: Create new child (" . $cnt . ")</debug>\n";
$this->m_Childs[$cnt] = new CLWG_dom_node;
$this->m_Childs[$cnt]->type = LWG_XML_ELEMENT_NODE;
$i--;
if ($this->m_Childs[$cnt]->loadXML($str, $i) === FALSE)
return FALSE;
}
else
$b = 0;
}
$i++;
$close_tag = "";
while ( ($i<strlen($str)) && ($str[$i] != ">") )
$close_tag .= $str[$i++];
//echo "<debug>DEBUG: close tag: ".$close_tag." - ".$this->tagname."</debug>\n";
if ($i == $str_len) return FALSE;
$i++;
$this->content = EntitiesToString($this->content);
//echo "<debug>DEBUG: content: ".$this->content."</debug>\n";
return ($close_tag == $this->tagname);
}
}
class CLWG_dom_xml
{
var $m_Root;
function CLWG_dom_xml()
{
$this->m_Root = 0;
}
function document_element()
{
return $this->m_Root;
}
function loadXML($xml_string)
{
// check xml tag
if (eregi("<\\?xml", $xml_string))
{
// check xml version
$xml_version = array();
if ( (eregi("<\\?xml version=\"([0-9\\.]+)\".*\\?>", $xml_string, $xml_version)) && ($xml_version[1] == 1.0) )
{
// initialize root
$this->m_Root = new CLWG_dom_node;
$i = 0;
return $this->m_Root->loadXML(eregi_replace("<\\?xml.*\\?>", "", $xml_string), $i);
}
else
{
echo "<error>Cannot find version attribute in xml tag</error>";
return FALSE;
}
}
else
{
echo "<error>Cannot find xml tag</error>";
return FALSE;
}
}
}
function lwg_domxml_open_mem($xml_string)
{
global $lwg_xml;
$lwg_xml = new CLWG_dom_xml;
if ($lwg_xml->loadXML($xml_string))
return $lwg_xml;
else
return 0;
}
?>