A simple PHP BBCode Parser function

php_bbcode_parser.php

<?php

/** 
* A simple PHP BBCode Parser function
*
* @author Afsal Rahim
* @link http://digitcodes.com/create-simple-php-bbcode-parser-function/
**/

//BBCode Parser function

function BBToHtml($text)
{
    $text = strip_tags($text);
    // BBcode array
    $find = array(
        '~\[b\](.*?)\[/b\]~s',
        '~\[i\](.*?)\[/i\]~s',
        '~\[u\](.*?)\[/u\]~s',
        '~\[quote\]([^"><]*?)\[/quote\]~s',
        '~\[size=([^"><]*?)\](.*?)\[/size\]~s',
        '~\[color=([^"><]*?)\](.*?)\[/color\]~s',
        '~\[url=([^"><]*?)\](.*?)\[/url\]~s',
        '~\[img\](https?://[^"><]*?\.(?:jpg|jpeg|gif|png|bmp))\[/img\]~s'
    );
    // HTML tags to replace BBcode
    $replace = array(
        '<b>$1</b>',
        '<i>$1</i>',
        '<span style="text-decoration:underline;">$1</span>',
        '<pre>$1</'.'pre>',
        '<span style="font-size:$1px;">$2</span>',
        '<span style="color:$1;">$2</span>',
        '<a href="$1">$2</a>',
        '<img src="$1" alt="" />'
    );
    // Replacing the BBcodes with corresponding HTML tags
    return preg_replace($find, $replace, $text);
}

// How to use the above function:

$bbtext = "This is [b]bold[/b] and this is [u]underlined[/u] and this is in [i]italics[/i] with a [color=red] red color[/color]. Напоминание о событии [url=https://bx24.wtcmoscow.ru/company/personal/user/1537/calendar/?EVENT_ID=54795&EVENT_DATE=11.10.2021]test[/url], 11.10.2021 18:55";
$htmltext = showBBcodes($bbtext);
echo $htmltext;

?>