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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

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    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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