Append HTML elements by PHP

Question

I want to append my head tag with script tag(with some contents) in external Html file using PHP code. But my Html is not updating or showing any errors.

PHP Code:

<?php

$doc = new DOMDocument();
$doc->loadHtmlFile( 'myfolder/myIndex.html');
$headNode = $doc->getElementsByTagName('head')->item(0);

$scriptNode = $doc->createElement("script");
$headNode->appendChild($scriptNode);

echo $doc->saveXML();

?>

Html File :

(A simple html pattern)

<html>
<head></head>
<body></body>
</html>

I have refered to the documentation here Couldn't figure out the problem still.

Are you perhaps under the impression that $doc->saveXML() would change the HTML file on the disk that you initially read the HTML code from …? — 04FS
– 04FS, Commented Sep 30, 2019 at 7:47

Professor Abronsius · Accepted Answer · 2019-09-30 08:33:27Z

1

Given a very simple HTML file ( simple.html )

<!DOCTYPE html>
<html lang='en'>
    <head>
        <meta charset='utf-8' />
        <title>A simple HTML Page</title>
    </head>
    <body>
        <h1>Simple HTML</h1>
        <p>Well this is nice!</p>
    </body>
</html>

Then using the following

$file='simple.html';


libxml_use_internal_errors( true );
$dom=new DOMDocument;
$dom->validateOnParse=false;
$dom->recover=true;
$dom->strictErrorChecking=false;
$dom->loadHTMLFile( $file );
$errors = libxml_get_errors();
libxml_clear_errors();




$script=$dom->createElement('script');
$script->textContent='/* Hello World */';

/* use [] notation rather than ->item(0) */
$dom->getElementsByTagName('head')[0]->appendChild( $script );



printf('<pre>%s</pre>',htmlentities( $dom->saveHTML() ));

/* write changes back to the html file - ie: save */
$dom->saveHTMLFile( $file );

will yield ( for display )

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>A simple HTML Page</title>
    <script></script></head>
    <body>
        <h1>Simple HTML</h1>
        <p>Well this is nice!</p>
    </body>
</html>

edited Sep 30, 2019 at 8:33

answered Sep 30, 2019 at 7:43

Professor Abronsius

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3 Comments

Abhishek Sarkar Over a year ago

printf displaying html fine, but html file is not updating similarly

Professor Abronsius Over a year ago

at the end you need to save the file once more.. I'll edit the answer

Professor Abronsius Over a year ago

Good - glad it helped

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