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@ 2018-02-28T03:17:50Z

<?php
function bbcodequote2html($matches){
    $text=(isset($matches[2])?$matches[2]:'');  // avoid Notices
    if(isset($matches[1]) && ctype_digit($matches[1])){
        $TPID = "#{$matches[1]}"; // GetThreadPoster($match[1]);
        $TPUN = "#{$matches[1]}"; // GetUsernameS($TPID);
        $quotee="<br>- <b>$TPUN</b>";
    }else{
        $quotee='';  // no id value or id is non-numeric default to empty string
    }
    return "<div class=\"panel panel-default\"><div class=\"panel-heading\">$text$quotee</div></div>";
}

$bbcode=<<<BBCODE
[quote=2]Outer Quote[b]bold [b]nested bold[/b][/b]
[i]italic [i]nested italic[/i][/i][quote]Inner Quote 1: (no id)[/quote]
[quote=bitethatapple]Inner Quote 2[quote=1]Inner Quote 3[/quote] still inner quote 2 [quote=mickmackusa]Inner Quote 4[/quote] end of inner quote 2[/quote][/quote]
BBCODE;

$converted=str_replace(
    ['[b]','[/b]','[i]','[/i]'],
    ['<b>','</b>','<i style=\"all:unset;font-style:italic;\">','</i>'],
    $bbcode
);

$tabs="\t";
do{
    $converted=preg_replace_callback('~\[quote(?:=(.+?))?]((?:(?R)|.*?)+)\[/quote]~is','bbcodequote2html',$converted,-1,$count);
}while($count);

echo $converted;

Output for git.master, git.master_jit, rfc.property-hooks: <div class="panel panel-default"><div class="panel-heading">Outer Quote<b>bold <b>nested bold</b></b> <i style=\"all:unset;font-style:italic;\">italic <i style=\"all:unset;font-style:italic;\">nested italic</i></i><div class="panel panel-default"><div class="panel-heading">Inner Quote 1: (no id)</div></div> <div class="panel panel-default"><div class="panel-heading">Inner Quote 2<div class="panel panel-default"><div class="panel-heading">Inner Quote 3<br>- <b>#1</b></div></div> still inner quote 2 <div class="panel panel-default"><div class="panel-heading">Inner Quote 4</div></div> end of inner quote 2</div></div><br>- <b>#2</b></div></div>

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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