{"id":1398,"date":"2018-01-19T19:22:47","date_gmt":"2018-01-19T19:22:47","guid":{"rendered":"http:\/\/goofy-trucks.flywheelsites.com\/dynamic-xml-conversion-using-the-sax-parser-page-4\/"},"modified":"2018-01-19T19:24:45","modified_gmt":"2018-01-19T19:24:45","slug":"dynamic-xml-conversion-using-the-sax-parser-page-4","status":"publish","type":"post","link":"https:\/\/phpbuilder.com\/dynamic-xml-conversion-using-the-sax-parser-page-4\/","title":{"rendered":"Dynamic XML Conversion Using the SAX Parser Page 4"},"content":{"rendered":"
\n
\n
By PHP Builder Staff<\/div>\n
on April 28, 2003<\/div>\n<\/p><\/div>\n
\n

What Is A Stack?<\/h2>\n
\nA stack is a simple data structure.
\nIt has two operations: Put data onto stack(“push”) and take data from stack (“pop”).\n<\/div>\n
\nImagine a stack of pizza boxes: You can put pizza Nr 1 on the stack, then pizza Nr 2, pizza Nr 3.<\/div>\n
\nWhen you now take the pizzas from the top of the stack, you get them in reverse order: Pizza 3, Pizza 2, Pizza 1.\n<\/div>\n
\nHere is the code for the stack: <\/div>\n
\n<\/p>\n

<?php
\n
$stack<\/span>=array();<\/p>\n

function\u00a0<\/span>push<\/span>(<\/span>$data<\/span>)\u00a0{
\n
\u00a0\u00a0\u00a0\u00a0global\u00a0<\/span>$stack<\/span>;
\n
\u00a0\u00a0\u00a0\u00a0<\/span>array_push<\/span>(<\/span>$stack<\/span>,<\/span>$data<\/span>);
\n
}<\/p>\n

function\u00a0<\/span>pop<\/span>()\u00a0{
\n
\u00a0\u00a0\u00a0\u00a0global\u00a0<\/span>$stack<\/span>;
\n
\u00a0\u00a0\u00a0\u00a0if(<\/span>count<\/span>(<\/span>$stack<\/span>)==<\/span>0<\/span>)\u00a0{
\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0die(<\/span>\"Error:\u00a0Buffer\u00a0Underflow!\"<\/span>);
\n
\u00a0\u00a0\u00a0\u00a0}
\n
\u00a0\u00a0\u00a0\u00a0return\u00a0<\/span>array_pop<\/span>(<\/span>$stack<\/span>);
\n
}
\n
<\/span>?>
\n
<\/span>
\n<\/span>
\n<\/code><\/font><\/div>\n

\nIn valid XML tags must not overlap, and for every opening tag there is a closing tag. The SAX parser walks through
\nthe script, and for every opening tag it reaches, our script will put its attributes onto the stack. Then, when it
\nreaches a closing tag, it takes one level from the stack.
\nSo when the parser is converting a document, and it has already processed 13 opening tags and 8 closing tags,
\nthere will be 5 elements on the stack.\n<\/div>\n
\nAs in XML the number of opening tags has to equal the number of closing tags, the stack will be empty when
\nthe parser reaches the end of the document. And as there are no overlapping tags, the data sets are always
\nfetched in the correct order. <\/div>\n
\nHere is a list of the steps our script will take to walk through a short piece of XML (the XML file contains
\nno character data, so only the opening and closing functions are called by SAX). <\/div>\n
\n
\n<doc>\n\t<tag1 parameter=\"Param 1\">\n\t\t<tag2 parameter=\"Param 2\">\n\t\t\t<tag3 parameter=\"Param 3\">\n\t\t\t<\/tag3>\n\t\t<\/tag2>\n\t<\/tag1>\n<\/doc>\n<\/pre>\n<\/div>\n
\n\n\n\n
\n
Parsed element       \n<tag1 parameter=\"Param 1\">\n<tag2 parameter=\"Param 2\">        \n<tag3 parameter=\"Param 3\">        \n<\/tag3>   handle_tag3(pop());\n<\/tag2>   handle_tag2(pop());\n<\/tag1>   handle_tag1(pop());\n<\/doc>    handle_doc(pop());\n      <\/pre>\n<\/td>\n
\n
Action\npush(array( 'PARAMETER'=>'Param 1'));\npush(array('PARAMETER'=>'Param 2'));\npush(array('PARAMETER'=>'Param 3'));\n\/\/receives array(''PARAMETER'=>'Param 3')\n\/\/receives array('PARAMETER'=>'Param 2')\n\/\/receives array( 'PARAMETER'=>'Param 1')\n\/\/receives array()\n      <\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
<\/p>\n
\n
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This article describes an alternative way of converting XML to HTML using the SAX parser. For each tag you<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1398","post","type-post","status-publish","format-standard","hentry","category-tutorials"],"_links":{"self":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/comments?post=1398"}],"version-history":[{"count":1,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1398\/revisions"}],"predecessor-version":[{"id":3268,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1398\/revisions\/3268"}],"wp:attachment":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/media?parent=1398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/categories?post=1398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/tags?post=1398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}