Modify HTML Attribute with PHP

Modify html attribute with php

Is there any simplier way for this or should I do it with DOM?

Do it with DOM.

Here's an example:

<?php
$html = '<a href="http://example.com" rel="nofollow external">test</a>';
$dom = new DOMDocument;
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$nodes = $xpath->query("//a[contains(concat(' ', normalize-space(@rel), ' '), ' external ')]");
foreach($nodes as $node) {
    $node->setAttribute('href', 'http://example.org');
}
echo $dom->saveHTML();

change html attributes or style using php

You can't. Your best bet is just putting a script tag inside or outside your php page.

Like

...?>
<script></script>
<?php...

or

<?php
echo"<script></script>";
?>

JQuery is NOT the only way you can change styles or attributes, imo native javascript is hell of a lot easier

Set an HTML attribute with PHP

When the user submits the data...

Do you mean there's a $_POST or $_GET request? If so, this would make a little more sense

<input id="username"
       name="username"
       placeholder="Username"
       value="<?php echo isset($_GET['username']) ? $_GET['username'] : '' ?>">

If $_GET['username'] isn't present, you will just get value="" which is perfectly fine

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Writing HTML via PHP by hand is a total chore. To combat this, I've written a utility called htmlgen which makes it quite a bit more tolerable

<?php
use function htmlgen\html as h;

h('input#username', [
  'name'=>'username',
  'placeholder'=>'Username',
  'value'=>isset($_GET['username']) ? $_GET['username'] : ''
]);

// => <input id="username" name="username" placeholder="Username" value="someuser">

What's the best practice to set html attribute via PHP?

You always want to HTML-encode things inside HTML attributes, which you can do with htmlspecialchars:

<span title="<?php echo htmlspecialchars($variable); ?>">

You probably want to set the second parameter ($quote_style) to ENT_QUOTES.

The only potential risk is that $variable may already be encoded, so you may want to set the last parameter ($double_encode) to false.

Php: modify attribute html tag

If I understand correctly you are need something like:

foreach ($dom->getElementsByTagName('option') as $item) {
    if ($item->getAttribute('selected') == "selected")
        $item->setAttribute("value", "-1");
}

This way you pass on your option items and set the value of the selected ones

Change tag attribute value with PHP DOMDocument

$dom = new DOMDocument();
$dom->loadHTML('<a href="http://foo.bar/">Click here</a>');

foreach ($dom->getElementsByTagName('a') as $item) {

    $item->setAttribute('href', 'http://google.com/');
    echo $dom->saveHTML();
    exit;
}

PHP getting and setting attributes on HTML Elements

// to get the 'src' attribute
$src = $frame->getAttribute('src');

// to set the 'src' attribute
$frame->setAttribute('src', 'newValue');

To change the URL, you should first use parse_url($src), then rebuild it with your new query arguments, for example:

$parts = parse_url($src);
extract($parts); // creates $host, $scheme, $path, $query...

// extract query string into an array;
// be careful if you have magic quotes enabled (this function may add slashes)
parse_str($query, $args);
$args['newArg'] = 'someValue';

// rebuild query string
$query = http_build_query($args);

$newSrc = sprintf('%s://%s%s?%s', $scheme, $host, $path, $query);

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