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@ 2021-02-08T13:41:23Z

<?php

$keywords = [
    'keywords' => 'www.1.com',
    'hello' => 'www.2.com',
    'there' => 'www.3.com',
    'are' => 'www.4.com',
];

$sentence = '
<div>
    <h1>Hello</h1>
    <h2>Hello there blablabla</h2>
    <p>Hello, there are keywords</p>
    <p>Hello, there are keywords</p>
    <p>Hello, there are keywords</p>
    <p>Hello, there are keywords</p>
    <p>Hello, there are keywords</p>
</div>';

$dom = new DOMDocument;
$dom->loadHTML($sentence, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
foreach ($dom->getElementsByTagName('p') as $p) {
    $p->nodeValue = preg_replace_callback(
        '~\b(?:' . implode('|', array_keys($keywords)) . ')\b~i',
        function($m) use ($keywords) {
            return $keywords[strtolower($m[0])];
        },
        $p->nodeValue
    );
}
echo $dom->saveHTML();

Output for git.master, git.master_jit, rfc.property-hooks: <div> <h1>Hello</h1> <h2>Hello there blablabla</h2> <p>www.2.com, www.3.com www.4.com www.1.com</p> <p>www.2.com, www.3.com www.4.com www.1.com</p> <p>www.2.com, www.3.com www.4.com www.1.com</p> <p>www.2.com, www.3.com www.4.com www.1.com</p> <p>www.2.com, www.3.com www.4.com www.1.com</p> </div>

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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