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XML 元素结构例程

第一个例程缩进显示文档中的开始元素结构。

示例 #1 显示 XML 元素结构

<?php
$file
= "data.xml";
$depth = 0;

function
startElement($parser, $name, $attrs)
{
global
$depth;

for (
$i = 0; $i < $depth; $i++) {
echo
" ";
}
echo
"$name\n";
$depth++;
}

function
endElement($parser, $name)
{
global
$depth;
$depth--;
}

$xml_parser = xml_parser_create();
xml_set_element_handler($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);
?>

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User Contributed Notes 3 notes

up
0
Joachim Kruyswijk
8 months ago
If you use strict_types=1, you'll get the warning "Notice: Resource ID#... used as offset, casting to integer".

Use

<?php $depth[(int) $parser?>

instead of

<?php $depth[$parser?>
up
-6
roan at horning dot us
13 years ago
The following example will echo back an xml file using the basic event based parser.  Currently, (at least in the version of PHP5 I'm using) it will skip The XML declaration and the Doctype declaration--they don't seem to be captured by the default handler.

<?php
echo "<pre>";

$file = "test.xml";
echo
$file."\n";
global
$inTag;

$inTag = "";
$xml_parser = xml_parser_create();
xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 0);
xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, 1);
xml_set_processing_instruction_handler($xml_parser, "pi_handler");
xml_set_default_handler($xml_parser, "parseDEFAULT");
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "contents");

if (!(
$fp = fopen($file, "r"))) {
    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)));
    }
}
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);

function
startElement($parser, $name, $attrs) {

    global
$inTag;
    global
$depth;
       
   
$padTag = str_repeat(str_pad(" ", 3), $depth);

    if (!(
$inTag == "")) {
        echo
"&gt;";
    }
    echo
"\n$padTag&lt;$name";
    foreach (
$attrs as $key => $value) {
        echo
"\n$padTag".str_pad(" ", 3);
        echo
" $key=\"$value\"";
    }
   
$inTag = $name;
   
$depth++;
}

function
endElement($parser, $name) {

    global
$depth;
   global
$inTag;
    global
$closeTag;
       
   
$depth--;

   if (
$closeTag == TRUE) {
       echo
"&lt/$name&gt;";
      
$inTag = "";
   } elseif (
$inTag == $name) {
       echo
" /&gt;";
      
$inTag = "";
   } else {
        
$padTag = str_repeat(str_pad(" ", 3), $depth);
       echo
"\n$padTag&lt/$name&gt;";
    } 
}
 
function
contents($parser, $data) {

    global
$closeTag;
   
   
$data = preg_replace("/^\s+/", "", $data);
   
$data = preg_replace("/\s+$/", "", $data);

    if (!(
$data == ""))  {
        echo
"&gt;$data";
       
$closeTag = TRUE;
    } else {
       
$closeTag = FALSE;
     }
}

function
parseDEFAULT($parser, $data) {
   
   
$data = preg_replace("/</", "&lt;", $data);
   
$data = preg_replace("/>/", "&gt;", $data);
    echo
$data;
}

function
pi_handler($parser, $target, $data) {

    echo
"&lt;?$target $data?&gt;\n";
}
echo
"</pre>";
?>
up
-22
Sample at hotmail dot com
9 years ago
<?php

public static function xml2array($element, $arr = array())
    {
        if(
is_string($element))
        {
           
$element = (strlen($element) > 5 && substr($element, -4) === '.xml')
                            ?
simplexml_load_file(DATAPATH.$element)
                            :
simplexml_load_string($element);
        }
        
$iter = 0;
        foreach(
$element->children() as $b)
        {
           
$a = $b->getName();
            if(!
$b->children()){
                   
$arr[$a] = trim($b[0]);
            }
            else{
                   
$arr[$a][$iter] = array();
                   
$arr[$a][$iter] = self::xml2array($b,$arr[$a][$iter]);
            }
               
$iter++;
        }
        return
$arr;
    }
}

?>
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