xml_set_character_data_handler
(PHP 4, PHP 5)
xml_set_character_data_handler — Set up character data handler
Описание
Sets the character data handler function for the XML parser parser .
Список параметров
- parser
-
- handler
-
handler is a string containing the name of a function that must exist when xml_parse() is called for parser .
The function named by handler must accept two parameters:
handler ( resource $parser , string $data )- parser
- The first parameter, parser, is a reference to the XML parser calling the handler.
- data
- The second parameter, data , contains the character data as a string.
Character data handler is called for every piece of a text in the XML document. It can be called multiple times inside each fragment (e.g. for non-ASCII strings).
If a handler function is set to an empty string, or FALSE, the handler in question is disabled.
Замечание: В качестве аргумента вместо имени функции может быть передан массив, содержащий ссылку на объект и имя метода.
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Обработка XML
- XML-анализатор
- utf8_decode
- utf8_encode
- xml_error_string
- xml_get_current_byte_index
- xml_get_current_column_number
- xml_get_current_line_number
- xml_get_error_code
- xml_parse_into_struct
- xml_parse
- xml_parser_create_ns
- xml_parser_create
- xml_parser_free
- xml_parser_get_option
- xml_parser_set_option
- xml_set_character_data_handler
- xml_set_default_handler
- xml_set_element_handler
- xml_set_end_namespace_decl_handler
- xml_set_external_entity_ref_handler
- xml_set_notation_decl_handler
- xml_set_object
- xml_set_processing_instruction_handler
- xml_set_start_namespace_decl_handler
- xml_set_unparsed_entity_decl_handler
Коментарии
the function handler is called several times when it parses the character data. It doesn't return the entire string as it suggests. There are special exceptions that will always force the parser to stop scanning and call the character data handler. This is when:
- The parser runs into an Entity Declaration, such as & (&) or ' (?)
- The parser finishes parsing an entity
- The parser runs into the new-line character (\n)
- The parser runs into a series of tab characters (\t)
And perhaps others.
For instance, if we have this xml content:
<mytag name=?Ken Egervari? title=?Chief Technology Officer?>
Ken has been Positive Edge's Chief Technology Officer for 2 years.
</mytag>
The parser will call the character data handler 6 times. This is what will happen:
1 \n
2 \t
3 Ken has been Positive Edge
4 ?
5 s Chief Technology Officer for 2 years.
6 \n
I hope that helps people out.
I just want to mention that i ran into a problem when parsing an xml file using the character data handler. If you happen to have a string which is also an internal php function stored in your xml data file and you want to output it as a string the parser dosent seem to recognize it.
I found a way around this problem. In my case i was storing a string with the value read. This would not allow me to output the data so to work around this problem i added a backslash for every character in the data element.
e.g. <xml>
from <element>read</element>
to <element>////read</element>
i dont know if anyone has ran into this problem or not but i thought i would just put it here just so in case someone is getting stuck with this.
If you need to trim the white space for HTML code and don't rely on spaces for formatting text (if you are then it is time to use Style Sheets) then this code will come in very useful.
$data=eregi_replace(">"."[[:space:]]+"."<","><",$data);
$data=eregi_replace(">"."[[:space:]]+",">",$data);
$data=eregi_replace("[[:space:]]+"."<","<",$data);
How to overide the 1024 characters limitation of xml_set_character_data_handler.
Took me some time to find out how to deal with that!
When calling a basic XML parser:
$parseurXML = xml_parser_create();
xml_set_element_handler($parseurXML, "opentagfunction", "closetagfunction");
xml_set_character_data_handler($parseurXML, "textfunction");
The textfunction only receive 1024 characters at once, even if the text is 4000 characters long. In facts, the parser seems to split the data in pieces of 1024 characters. The way to handle that is to concatenate them.
example:
If you have an XML tag called UNIPROT_ABSTRACT containing a 4000 characters protein description:
function textfunction($parser, $text)
{
if ($last_tag_read=='UNIPROT_ABSTRACT') $uniprot.=$text;
}
The function is called 4 times and receives 1024+1024+1024+928 characters that will be concatenated in the $uniprot variable using the ".=" concatenation fonction.
Easy to do, but not documented!
re. to Philippe Marc , and karuna_gadde examples
i found out that the xml_set_character_data_handler call back function can be called more often for the same element in particular the content is just a few chars long (happen on windows)
so a check up can give you the answer an may be for long strings too.
eg:
<?php
xml_set_character_data_handler($this->parser, "cdata");
//...
function cdata($parser, $cdata) {
// ...
if(isset($this->data[$this->currentItem][$this->currentField])) {
$this->data[$this->currentItem][$this->currentField] .= $cdata;
} else {
$this->data[$this->currentItem][$this->currentField] = $cdata;
}
?>
It would be nice if someone could complete documentation of this function. I think that the "splitting" behaviour should (at least) be mentioned within the documentation, if not explained (please!). I'm not quite sure whether the cut comes after each 1024bytes/chars of data.
My experience looks as follows:
[xmlFile]
...
<label>slo|?ka</label>
<comment>koment|?ř slo?ky</comment>
...
[/xmlFile]
(Places where the character-data got splitted are marked with pipes. Plus there was latin small letter 'r' with caron instead of ř.)
Since the splitting is not mentioned in documentation one could assume that it is a bug; especially when you work with UTF-8 and the cuts come right before some special characters.
(Should the concatenating of $cData be considered to be the proper & 'final' way of processing character-data?)
Also I'd suggest to add another line in "Description" when fc has an alternate usage (instead of hiding it within the "Note" :o); in this particular case I'd prefer this:
Description:
bool xml_set_character_data_handler ( resource parser, callback handler )
bool xml_set_character_data_handler ( resource parser, object reference, method name )
... there are dozens of functions ofcourse where documentation works this way (I mean not mentioning the alternate usage in the "Description" part).
Have a nice day
Yaroukh
I too love the undocumented "splitting" functionality :-p.
Rather than concatinating the data based on whether or not the current tag name has changed from the previous tag name I suggest always concatinating like the following with the $catData variable being unset in the endElement function:
<?php
function endElement ($parser, $data) {
global $catData;
// Because we are at an element end we know any splitting is finished
unset($GLOBALS['catData']);
}
function characterData ($parser, $data) {
global $catData;
// Concatinate data in case splitting is taking place
$catData.=$data;
}
?>
This got me around a problem with data like the following where, because characterData is not called for empty tags, the previous and current tag names were the same even though splitting was not taking place.
<companydept>
<companydeptID></companydeptID>
<companyID>1</companyID>
<companydeptName></companydeptName>
</companydept>
<companydept>
<companydeptID></companydeptID>
<companyID>2</companyID>
<companydeptName></companydeptName>
</companydept>
<companydept>
<companydeptID></companydeptID>
<companyID>3</companyID>
<companydeptName></companydeptName>
</companydept>
re: jason at omegavortex dot com below, another way to deal with whitespace issues is:
function charData($parser,$data)
{
$char_data = trim($data);
if($char_data)
$char_data = preg_replace('/ */',' ',$data);
$this->cdata .= $char_data;
}
This means that:
<p>here is my text <a href="something">my text</a>
and here is some more after some spaces at the
beginning of the line</p>
comes out properly. You could do further replacements if you want to deal with tabs in your files. i only ever use spaces. if you only use trim() then you would lose the space before the <a> tag above, but trim() is a good way to check for completely empty char data, then just replace more than one space with a single space. this will preserve a single space at the beginning and end of the cdata.
To detect that concatenation of data is taking place, you can keep track of whether the last function call was to the data processing function.
e.g. using $this->inside_data variable below:
<?php
xml_set_element_handler($this->parser, "start_tag", "end_tag");
xml_set_character_data_handler($this->parser, "contents");
protected function contents($parser, $data)
{
switch ($this->current_tag) {
case "name":
if ($this->inside_data)
$this->name .= $data; // need to concatenate data
else
$this->name = $data;
break;
...
}
$this->inside_data = true;
}
protected function start_tag($parser, $name)
{
$this->current_tag = $name;
$this->inside_data = false;
}
protected function end_tag() {
$this->current_tag = '';
$this->inside_data = false;
}
?>