php教程

xml_parser_create

(PHP 4, PHP 5, PHP 7)

xml_parser_create建立一个 XML 解析器

描述

xml_parser_create ([ string $encoding ] ) : resource

函数 xml_parser_create() 建立一个新的 XML 解析器并返回可被其它 XML 函数使用的资源句柄。

可选参数 encoding 在 PHP 4 中用来指定要被解析的 XML 输入的字符编码方式。PHP 5 开始,自动侦测输入的 XML 的编码,因此 encoding 参数仅用来指定解析后输出数据的编码。在 PHP 4 总,默认输出的编码与输入数据的编码是相同的。如果传递了空字符串,解析器会尝试搜索头 3 或 4 个字节以确定文档的编码。在 PHP 5.0.0 和 5.0.1 总,默认输出的字符编码是 ISO-8859-1,而 PHP 5.0.2 及以上版本是 UTF-8。解析器支持的编码有 ISO-8859-1, UTF-8US-ASCII

请参阅函数 xml_parser_create_ns()xml_parser_free()

User Contributed Notes

bishop at php dot net 17-Feb-2019 04:23
Internals has proposed[1] changing this extension from resource-based to object-based. When this change is made, xml_parser_create will return an object, not a resource. Application developers are encouraged to replace any checks for explicit success, like:

<?php
$res
= xml_parser_create(/*...*/);
if (!
is_resource($res)) {
   
// ...
}
?>

With a check for explicit failure:
<?php
$res
= xml_parser_create(/*...*/);
if (
false === $res) {
   
// ...
}

[
1]: https://marc.info/?l=php-internals&m=154998365013373&w=2
marek995 at seznam dot cz 24-Sep-2010 11:46
I created a function, which combines xml_paresr_create and all functions around.

<?php
function html_parse($file)
     {
     
$array = str_split($file, 1);
     
$count = false;
     
$text = "";
     
$end = false;
      foreach(
$array as $temp)
       {
        switch(
$temp)
         {
          case
"<":
          
between($text);
          
$text = "";
          
$count = true;
          
$end = false;
           break;
          case
">":
           if(
$end == true) {end_tag($text);}
           else {
start_tag($text);}
          
$text = "";
           break;
          case
"/":
           if(
$count == true) {$end = true;}
           else {
$text = $text . "/";}
           break;
          default:
          
$count = false;
          
$text = $text . $temp;
         }
       }
     }
?>
The input value is a string.
It calls functions start_tag() , between() and end_tag() just like the original xml parser.

But it has a few differences:
  - It does NOT check the code. Just resends values to that three functions, no matter, if they are right
  - It works with parameters. For example: from tag <sth b="42"> sends sth b="42"
  - It works wit diacritics. The original parser sometimes wrapped the text before the first diacritics appearance.
  - Works with all encoding. If the input is UTF-8, the output will be UTF-8 too
  - It works with strings. Not with file pointers.
  - No "Reserved XML name" error
  - No doctype needed
  - It does not work with commentaries, notes, programming instructions etc. Just the tags

definition of the handling functions is:

<?php
function between($stuff) {}
?>

No other attributes
juanhdv at NOSPAM dot divvol dot org 05-Dec-2007 12:08
In PHP 5, when including in your xml file the definition '<?xml version="1.0" encoding="ISO-8859-1" ?>',   I'd also recommend adding the option below:
 
xml_parser_set_option($xml_parser,XML_OPTION_TARGET_ENCODING, "ISO-8859-1").

It works fine!

If your enconding is 'UTF-8', just replace 'ISO-8859-1'.
19-Apr-2006 07:42
I'd also recommend adding the option below
xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,1);
Tobbe 25-May-2005 06:01
The above "XML to array" code does not work properly if you have several tags on the same level and with the same name, example:

<currenterrors>
<error>
<description>This is a real error...</description>
</error>
<error>
<description>This is a second error...</description>
</error>
<error>
<description>Lots of errors today...</description>
</error>
<error>
<description>This is the last error...</description>
</error>
</currenterrors>

It will then only display the first <error>-tag.
In this case you will need to number the tags automatically or maybe have several arrays for each new element.
php at stock-consulting dot com 21-Feb-2005 02:47
Even though I passed "UTF-8" as encoding type PHP (Version 4.3.3) did *not* treat the input file as UTF-8. The input file was missing the BOM header bytes (which may indeed be omitted, according to RFC3629...but things are a bit unclear there. The RFC seems to make mere recommendations concering the BOM header). If you want to sure that PHP treats an UTF-8 encoded file correctly, make sure that it begins with the corresponding 3 byte BOM header (0xEF 0xBB 0xBF)
jcalvert at gmx dot net 03-Apr-2004 10:39
To maintain compatibility between PHP4 and PHP5 you should always pass a string argument to this function. PHP4 autodetects the format of the input if you leave it out whereas PHP5 will assume the format to be ISO-8859-1 (and choke on the byte order marker of UTF-8 files).

Calling the function as <?php $res = xml_parser_create('') ?> will cause both versions of PHP to autodetect the format.

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