Remove HTML Attributes using PHP

Question

Using PHP i want to remove all HTML attributes except

"src" attribute from "img" tag

and

"href" attribute from "a" tag

My Input file is .html file which is been converted from .doc and .docx

My output file again should be HTML file with removed attribute

Kindly help me please

Edit ::

After Trying alexander script as below if i open the strip.html in code editor i don't see any changes

<?php
$path = '/var/www/strip.html';
$html = file_get_contents($path);
$dom = new DOMDocument();
$dom->strictErrorChecking = false;
$dom->formatOutput = true;
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
if (false === ($elements = $xpath->query("//img"))) die('Error');

foreach ($elements as $element) {
    for ($i = $element->attributes->length; --$i >= 0;) {
        $name = $element->attributes->item($i)->name;
        if ('src' !== $name) {
            $element->removeAttribute($name);
        }
    }
}

if (false === ($elements = $xpath->query("//a"))) die('Error');

foreach ($elements as $element) {
    for ($i = $element->attributes->length; --$i >= 0;) {
        $name = $element->attributes->item($i)->name;
        if ('href' !== $name) {
            $element->removeAttribute($name);
        }
    }
}

$dom->saveHTMLFile($path);

?>

@stefan how to make it work as if i input html and click a button i should ask to save the processed html file ??? — PHP Geany
– PHP Geany, Commented Apr 16, 2014 at 13:21
That link should help you get started, I'm not going to architect your app for you but after you get your html, however that be, pass it through the regex(es). — Stefan
– Stefan, Commented Apr 16, 2014 at 13:27

Community · Accepted Answer · 2017-05-23 10:32:26Z

2

Use DOMDocument class for parsing HTML ("a" and "img" tags processing):

$path = '/path/to/file.html';
$html = file_get_contents($path);
$dom = new DOMDocument();
//$dom->strictErrorChecking = false;
$dom->formatOutput = true;
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
if (false === ($elements = $xpath->query("//img"))) die('Error');

foreach ($elements as $element) {
    for ($i = $element->attributes->length; --$i >= 0;) {
        $name = $element->attributes->item($i)->name;
        if ('src' !== $name) {
            $element->removeAttribute($name);
        }
    }
}

if (false === ($elements = $xpath->query("//a"))) die('Error');

foreach ($elements as $element) {
    for ($i = $element->attributes->length; --$i >= 0;) {
        $name = $element->attributes->item($i)->name;
        if ('href' !== $name) {
            $element->removeAttribute($name);
        }
    }
}

$dom->saveHTMLFile($path);

Also, read why you can't parse [X]HTML with regex and take a look at useful xpath links.

Update (all tags with exception "a" and "img" attributes processing):

$path = '/path/to/file.html';
$html = file_get_contents($path);
$dom = new DOMDocument();
//$dom->strictErrorChecking = false;
$dom->formatOutput = true;
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
if (false === ($elements = $xpath->query("//*"))) die('Error');

foreach ($elements as $element) {
    for ($i = $element->attributes->length; --$i >= 0;) {
        $name = $element->attributes->item($i)->name;
        if (('img' === $element->nodeName && 'src' === $name)
            || ('a' === $element->nodeName && 'href' === $name)
        ) {
            continue;
        }

        $element->removeAttribute($name);
    }
}

$dom->saveHTMLFile($path);

edited May 23, 2017 at 10:32

CommunityBot

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answered Apr 16, 2014 at 18:02

Alexander Yancharuk

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16 Comments

PHP Geany Over a year ago

THis is outputing the same file as input... What i did : saved the code you gave as php , changed the $path value to the input file path also added a new string $pathh for output path and in last line changed $path to $pathh .. loaded the php file in browser .i received the output as same as input in the $pathh dir .. attributes was not removed

Alexander Yancharuk Over a year ago

@PHPGeany Definitely, you did something wrong, because this code is ok. Proof: codepad link

Alexander Yancharuk Over a year ago

@PHPGeany "loaded the php file in browser"? Do you have installed http-server on your local machine? Did you try to run this code through console, like "php codesource.php"? Browsers haven't integrated php-interpreter, thats why loading php-code in browser does nothing.

PHP Geany Over a year ago

find the edit i made in my original question i use lamp stack i tried using local browser as localhost/path.php

Alexander Yancharuk Over a year ago

Do you have any errors/warnings in error_log? Try to change $dom->saveHTMLFile($path); to var_dump($dom->saveHTML()); to see if there is problems with attribs removing.

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