CODEWITHSUNDEEP
phpxmlxsltdomdocumentlibxslt
ToX 82
ToX 82

Reputation: 1074

XSLTProcessor::transformToUri(): Memory allocation failed : reaching arbitrary MAX_URI_LENGTH limit

I have some XML files that I need to "transform" in Html and display on screen.

I have developed a simple script that works -almost- all of the times, using DOMDocument and XSLTProcessor.

The problem is that sometimes it gives this error, and the resulting html is only a part of the complete content:

XSLTProcessor::transformToUri(): Memory allocation failed : reaching arbitrary MAX_URI_LENGTH limit in /var/www/test/index.php on line 14

This is a working copy of my script, which gives the same error with the same files.

<?php
$xslPath = 'test.xsl';
$xmlString = file_get_contents('test.xml');

$xml = new DOMDocument;
$xml->loadXML($xmlString);

$xsl = new DOMDocument;
$xsl->load($xslPath);

$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl);

$proc->transformToURI($xml, 'php://output');

I have tried to save the output to a file, but still I am having the same error, so php://output shouldn't be the a problem. How can I solve this issue?

EDIT: It looks like the problem lies in the following code. If fact, if I remove the following lines, I am no longer seeing the issue. I hope this helps:

<a name="link" href="data:{$mimeType}/{$format};base64,{normalize-space(Attachment)}" download="{$attachmentName}">
    <xsl:value-of select="attachmentName" />
</a>

The attachment itself is a base64 pdf file (which in this case is a ~1mb string, but it could be even more)

EDIT 2: This is what happens if I try to generate the html using the command line xsltproc command:

xsltproc --stringparam target cora_cmd test.xsl test.xml > test.html
URI error : Memory allocation failed : reaching arbitrary MAX_URI_LENGTH limit
URI error : Memory allocation failed : escaping URI value

EDIT 3: I have tried replacing transformToURI with transformToXML, no results. libxml_get_errors() shows no results too.

Upvotes: 0

Views: 1405

Answers (2)

Dasitha Abeysinghe
Dasitha Abeysinghe

Reputation: 451

You can resolve this memory issue by using the

XMLReader

PHP class instead of

DOMDocument

If you're using the Magento framework, you can use

Laminas\Config\Reader\Xml

instead of

Magento\Framework\Xml\Parser

class.

DOMDocument class will try to load all the XML content to memory at once but XMLReader class will NOT load the content to memory at once. It will read the nodes set by set incrementally.

You can find more info on this one in this article https://medium.com/devops-dev/way-to-read-large-xml-dataset-in-magento-2-using-laminas-config-reader-xml-2b59c936bbcc :)

Cheers!

Upvotes: 0

Jack Crane
Jack Crane

Reputation: 71

You need to increase the amount of memory PHP is allowed to use in a script. Start by opening your php.ini file. If you don't know where it is located, run php --ini in the terminal, or look for the row titled Loaded Configuration File and edit that (you may need sudo access).

Locate the variable memory_limit and change it to something larger. (I changed mine from 128M to 512M).

Beware of potential ramifications of doing this: you may run into issues with running out of memory.

Upvotes: 0

Related Questions