xml

由 xml_parser_create() 和 xml_parser_create_ns() 返回的 xml 资源引用了一个 XML 解析器实例，将被用在本扩展库提供的函数中。

XML 元素结构范例

第一个范例用缩进格式显示一个文档中起始元素的结构。

例子 1. 显示 XML 元素结构 <?php $file = "data.xml" ; $depth = array(); function startElement ( $parser , $name , $attrs ) {     global $depth ;     for ( $i = 0 ; $i < $depth [ $parser ]; $i ++) {         echo "  " ;     }     echo "$name \n " ;      $depth [ $parser ]++; } function endElement ( $parser , $name ) {     global $depth ;      $depth [ $parser ]--; } $xml_parser = xml_parser_create (); xml_set_element_handler ( $xml_parser , "startElement" , "endElement" ); if (!( $fp = fopen ( $file , "r" ))) {     die( "could not open XML input" ); } while ( $data = fread ( $fp , 4096 )) {     if (! xml_parse ( $xml_parser , $data , feof ( $fp ))) {         die( sprintf ( "XML error: %s at line %d" ,                      xml_error_string ( xml_get_error_code ( $xml_parser )),                      xml_get_current_line_number ( $xml_parser )));     } } xml_parser_free ( $xml_parser ); ?>

XML 标记符映射范例

例子 2. 将 XML 映射为 HTML 以下范例将 XML 文档中的标记符直接映射成 HTML 标记符。在“映射数组”中不存在的元素将被忽略。当然，该范例将只对一个特定的 XML 文档有效。 <?php $file = "data.xml" ; $map_array = array(      "BOLD"      => "B" ,      "EMPHASIS" => "I" ,      "LITERAL"   => "TT" ); function startElement ( $parser , $name , $attrs ) {     global $map_array ;     if (isset( $map_array [ $name ])) {         echo "<$map_array [ $name ] >" ;     } } function endElement ( $parser , $name ) {     global $map_array ;     if (isset( $map_array [ $name ])) {         echo "</$map_array [ $name ] >" ;     } } function characterData ( $parser , $data ) {     echo $data ; } $xml_parser = xml_parser_create (); // 使用大小写折叠来保证我们能在元素数组中找到这些元素名称 xml_parser_set_option ( $xml_parser , XML_OPTION_CASE_FOLDING , true ); xml_set_element_handler ( $xml_parser , "startElement" , "endElement" ); xml_set_character_data_handler ( $xml_parser , "characterData" ); if (!( $fp = fopen ( $file , "r" ))) {     die( "could not open XML input" ); } while ( $data = fread ( $fp , 4096 )) {     if (! xml_parse ( $xml_parser , $data , feof ( $fp ))) {         die( sprintf ( "XML error: %s at line %d" ,                      xml_error_string ( xml_get_error_code ( $xml_parser )),                      xml_get_current_line_number ( $xml_parser )));     } } xml_parser_free ( $xml_parser ); ?>

XML 外部实体范例

该范例能够高亮显示 XML 源代码。它将说明如何外部实体指向处理器来包含和解析其它文档，如何处理 PIs，以及一种确定包含有 PIs 的代码的可信度。

能被该范例使用的的 XML 文档（ xmltest.xml 和 xmltest2.xml ）被列在该范例之后。

例子 3. 外部实体范例 <?php $file = "xmltest.xml" ; function trustedFile ( $file ) {      // only trust local files owned by ourselves      if (! eregi ( "^([a-z]+)://" , $file )         && fileowner ( $file ) == getmyuid ()) {             return true ;     }     return false ; } function startElement ( $parser , $name , $attribs ) {     echo "&lt;<font color= \" #0000cc \" >$name</font>" ;             if ( count ( $attribs )) {                 foreach ( $attribs as $k => $v ) {             echo " <font color= \" #009900 \" >$k</font>= \" <font                    color= \" #990000 \" >$v</font> \" " ;         }     }     echo "&gt;" ; } function endElement ( $parser , $name ) {     echo "&lt;/<font color= \" #0000cc \" >$name</font>&gt;" ; } function characterData ( $parser , $data ) {     echo "<b>$data</b>" ; } function PIHandler ( $parser , $target , $data ) {     switch ( strtolower ( $target )) {         case "php" :             global $parser_file ;              // If the parsed document is "trusted", we say it is safe             // to execute PHP code inside it.  If not, display the code             // instead.              if ( trustedFile ( $parser_file [ $parser ])) {                 eval( $data );             } else {                  printf ( "Untrusted PHP code: <i>%s</i>" ,                          htmlspecialchars ( $data ));             }             break;     } } function defaultHandler ( $parser , $data ) {     if ( substr ( $data , 0 , 1 ) == "&" && substr ( $data , - 1 , 1 ) == ";" ) {          printf ( '<font color="#aa00aa">%s</font>' ,                  htmlspecialchars ( $data ));     } else {          printf ( '<font size="-1">%s</font>' ,                  htmlspecialchars ( $data ));     } } function externalEntityRefHandler ( $parser , $openEntityNames , $base , $systemId ,                                    $publicId ) {     if ( $systemId ) {         if (!list( $parser , $fp ) = new_xml_parser ( $systemId )) {              printf ( "Could not open entity %s at %s\n" , $openEntityNames ,                     $systemId );             return false ;         }         while ( $data = fread ( $fp , 4096 )) {             if (! xml_parse ( $parser , $data , feof ( $fp ))) {                  printf ( "XML error: %s at line %d while parsing entity %s\n" ,                         xml_error_string ( xml_get_error_code ( $parser )),                         xml_get_current_line_number ( $parser ), $openEntityNames );                  xml_parser_free ( $parser );                 return false ;             }         }          xml_parser_free ( $parser );         return true ;     }     return false ; } function new_xml_parser ( $file ) {     global $parser_file ;      $xml_parser = xml_parser_create ();      xml_parser_set_option ( $xml_parser , XML_OPTION_CASE_FOLDING , 1 );      xml_set_element_handler ( $xml_parser , "startElement" , "endElement" );      xml_set_character_data_handler ( $xml_parser , "characterData" );      xml_set_processing_instruction_handler ( $xml_parser , "PIHandler" );      xml_set_default_handler ( $xml_parser , "defaultHandler" );      xml_set_external_entity_ref_handler ( $xml_parser , "externalEntityRefHandler" );     if (!( $fp = @ fopen ( $file , "r" ))) {         return false ;     }     if (! is_array ( $parser_file )) {          settype ( $parser_file , "array" );     }      $parser_file [ $xml_parser ] = $file ;     return array( $xml_parser , $fp ); } if (!(list( $xml_parser , $fp ) = new_xml_parser ( $file ))) {     die( "could not open XML input" ); } echo "<pre>" ; while ( $data = fread ( $fp , 4096 )) {     if (! xml_parse ( $xml_parser , $data , feof ( $fp ))) {         die( sprintf ( "XML error: %s at line %d\n" ,                      xml_error_string ( xml_get_error_code ( $xml_parser )),                      xml_get_current_line_number ( $xml_parser )));     } } echo "</pre>" ; echo "parse complete\n" ; xml_parser_free ( $xml_parser ); ?>

例子 4. xmltest.xml <?xml version='1.0'?> <!DOCTYPE chapter SYSTEM "/just/a/test.dtd" [ <!ENTITY plainEntity "FOO entity"> <!ENTITY systemEntity SYSTEM "xmltest2.xml"> ]> <chapter> <TITLE>Title &plainEntity;</TITLE> <para> <informaltable> <tgroup cols="3"> <tbody> <row><entry>a1</entry><entry morerows="1">b1</entry><entry>c1</entry></row> <row><entry>a2</entry><entry>c2</entry></row> <row><entry>a3</entry><entry>b3</entry><entry>c3</entry></row> </tbody> </tgroup> </informaltable> </para> &systemEntity; <section id="about"> <title>About this Document</title> <para> <!-- this is a comment --> <?php echo 'Hi! This is PHP version ' . phpversion(); ?> </para> </section> </chapter>

以下文档将被 xmltest.xml 文件调用：

例子 5. xmltest2.xml <?xml version="1.0"?> <!DOCTYPE foo [ <!ENTITY testEnt "test entity"> ]> <foo> <element attrib="value"/> &testEnt; <?php echo "This is some more PHP code being executed."; ?> </foo>