Codeigniter dompdf：无效字符错误

Question

When I try to print a pdf I get this error:

An uncaught Exception was encountered

Type: DOMException

Message: Invalid Character Error

Filename: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/lib/html5lib/TreeBuilder.php

Line Number: 3191

Backtrace:

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/lib/html5lib/TreeBuilder.php
Line: 3191
Function: setAttribute

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/lib/html5lib/TreeBuilder.php
Line: 1493
Function: insertElement

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/lib/html5lib/Tokenizer.php
Line: 2456
Function: emitToken

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/lib/html5lib/Tokenizer.php
Line: 1102
Function: emitToken

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf/src/Dompdf.php
Line: 470
Function: parse

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/helpers/dompdf_helper.php
Line: 26
Function: loadHtml

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/application/controllers/admin/Estimates.php
Line: 136
Function: pdf_create

File: /home/ireto/domains/ireto.be/public_html/madicbelgium/index.php
Line: 293
Function: require_once

This is my code on line :3191 ->

private function insertElement($token, $append = true) {
    $el = $this->dom->createElementNS(self::NS_HTML, $token['name']);

    if (!empty($token['attr'])) {
        foreach ($token['attr'] as $attr) {
            if (!$el->hasAttribute($attr['name']) && preg_match("/[^A-Za-z0-9]/u", $attr['name'])) {
                $el->setAttribute($attr['name'], $attr['value']);
            }
        }
    }
    if ($append) {
        $this->appendToRealParent($el);
        $this->stack[] = $el;
    }

    return $el;
}

Answer 1

if you face an error like An uncaught Exception was encountered the best way is, to actually catch the exception, because you get the answer for your error in your Exception

the following code snippet should do what i mean

private function insertElement($token, $append = true) {

    try
    {
        $el = $this->dom->createElementNS(self::NS_HTML, $token['name']);

        if (!empty($token['attr'])) {
            foreach ($token['attr'] as $attr) {
                if (!$el->hasAttribute($attr['name']) && preg_match("/[^A-Za-z0-9]/u", $attr['name'])) {
                    $el->setAttribute($attr['name'], $attr['value']);
                }
            }
        }
        if ($append) {
            $this->appendToRealParent($el);
            $this->stack[] = $el;
        }



        return $el;
    }
    catch (DOMException $e)
    {
        echo '<strong>Errormessage:</strong>'.$e->getMessage().'<br />';
        echo $e->getTraceAsString();

    }
}

if you have an error now, you should see the exact information in order to fix this error, something like the following occurs:

Errormessage: Invalid Character Error

#0 [...][...](7): DOMElement->setAttribute('1pro-1', 'someValue')
#1 {main}DOMException Object