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xml_parser_create

(PHP 4, PHP 5, PHP 7, PHP 8)

xml_parser_createCreación de un analizador XML

Descripción

xml_parser_create(?string $encoding = null): XMLParser

xml_parser_create() crea un analizador XML y devuelve una instancia de XMLParser para ser utilizada con las demás funciones XML.

Parámetros

encoding

La codificación de entrada se detecta automáticamente, por lo que el argumento encoding solo especifica la codificación de salida. Si se pasa una cadena vacía, el analizador intenta identificar en qué codificación está codificado el documento examinando los 3 o 4 octetos superiores. El juego de caracteres de salida por omisión es UTF-8. Las codificaciones admitidas son ISO-8859-1, UTF-8, y US-ASCII.

Valores devueltos

Devuelve una nueva instancia de XMLParser.

Historial de cambios

Versión Descripción
8.0.0 Esta función devuelve ahora una instancia de XMLParser; anteriormente, se devolvía un resource, o false en caso de error.
8.0.0 encoding es ahora nullable.

Ver también

add a note

User Contributed Notes 5 notes

up
12
marek995 at seznam dot cz
14 years ago
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
up
2
jcalvert at gmx dot net
21 years ago
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.
up
1
Tobbe
20 years ago
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.
up
-1
php at stock-consulting dot com
20 years ago
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)
up
-1
bishop at php dot net
6 years ago
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
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