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xml2json_spark.php
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xml2json_spark.php
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<?php
if ($_REQUEST['xml']) {
$xml_string = $_REQUEST['xml'];
$xml_string = trim($xml_string);
// PHP XSLT Processing from http://www.tonymarston.net/php-mysql/xsl.html
$xp = new XsltProcessor();
// This obtains the XSL stylesheet from an external file and loads it into the XSLT resource. It will also load in any external templates specified with the <xsl:include> command.
// create a DOM document and load the XSL stylesheet
$xsl = new DomDocument;
$xsl->load('xml2json_spark.xsl');
// import the XSL styelsheet into the XSLT process
$xp->importStylesheet($xsl);
// This obtains the XML data from an external file and loads it into a separate document instance.
// create a DOM document and load the XML data
$xml_doc = new DomDocument;
// Import an XML flat file
// $xml_doc->load('discovery.xml');
// Import an XML document as a string
$xml_doc->loadXML($xml_string);
// This involves using the transformation method of the XSLT resource created ealier with a specified XML document:
// transform the XML into JSON using the XSL file
if ($json = $xp->transformToXML($xml_doc)) {
$json = indent($json);
} else {
trigger_error('XSL transformation failed.', E_USER_ERROR);
}
}
/**
* Indents a flat JSON string to make it more human-readable.
* From http://recursive-design.com/blog/2008/03/11/format-json-with-php/
*
* @param string $json The original JSON string to process.
*
* @return string Indented version of the original JSON string.
*/
function indent($json) {
$result = '';
$pos = 0;
$strLen = strlen($json);
$indentStr = ' ';
$newLine = "\n";
$prevChar = '';
$outOfQuotes = true;
for ($i=0; $i<=$strLen; $i++) {
// Grab the next character in the string.
$char = substr($json, $i, 1);
// Are we inside a quoted string?
if ($char == '"' && $prevChar != '\\') {
$outOfQuotes = !$outOfQuotes;
// If this character is the end of an element,
// output a new line and indent the next line.
} else if(($char == '}' || $char == ']') && $outOfQuotes) {
$result .= $newLine;
$pos --;
for ($j=0; $j<$pos; $j++) {
$result .= $indentStr;
}
}
// Add the character to the result string.
$result .= $char;
// If the last character was the beginning of an element,
// output a new line and indent the next line.
if (($char == ',' || $char == '{' || $char == '[') && $outOfQuotes) {
$result .= $newLine;
if ($char == '{' || $char == '[') {
$pos ++;
}
for ($j = 0; $j < $pos; $j++) {
$result .= $indentStr;
}
}
$prevChar = $char;
}
return $result;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>XML to JSON using the Spark Convention</title>
<style type="text/css">
textarea {
display : block;
width : 60em;
height : 30em;
}
#submit {
margin-bottom : 3em;
}
</style>
</head>
<body>
<h3>XML to JSON Conversion using the Spark Convention</h3>
<ul>
<li><a href="#">View documentation on the Spark Convention (nonexistant)</a></li>
<li>View the source of this conversion script: <a href="xml2json_spark_php.txt">PHP</a> and <a href="xml2json_spark.xsl">XSL transformation rules</a></li>
</ul>
<form method="POST" action="">
<label for="xml">Enter some XML:</label>
<textarea id="xml" name="xml" columns="50" rows="10"><?php if($json) echo $xml_string; ?></textarea>
<input id="submit" type="submit" value="Convert to JSON" />
</form>
<?php
if($json) echo "<label>Your XML as JSON:</label><textarea>$json</textarea>";
?>
</body>
</html>