I'm trying to run the preg_replace() function to replace the content in between two custom tags (i.e. [xcode]) within the string / content of the page.
What I want to do with the content between these custom tags is to run it through highlight_string() function and to remove those custom tags from the output.
Any idea how to do it?
So you want sort of a BBCode parser. The example below replaces [xcode] tags with whatever markup you like.
<?php
function highlight($text) {
$text = preg_replace('#\[xcode\](.+?)\[\/xcode\]#msi', '<em>\1</em>', $text);
return $text;
}
$text = '[xcode]Lorem ipsum[/xcode] dolor sit [xcode]amet[/xcode].';
echo highlight($text);
?>
Use preg_replace_callback() if you want to pass the matched text to a function:
<?php
function parse($text) {
$text = preg_replace_callback('#\[xcode\](.+?)\[\/xcode\]#msi',
function($matches) {
return highlight_string($matches[1], 1);
}
, $text);
return $text;
}
$text = '[xcode]Lorem ipsum[/xcode] dolor sit [xcode]amet[/xcode].';
echo bbcode($text);
?>
I'll include the source code of a BBCode parser that I made a long time ago. Feel free to use it.
<?php
function bbcode_lists($text) {
$pattern = "#\[list(\=(1|a))?\](.*?)\[\/list\]#msi";
while (preg_match($pattern, $text, $matches)) {
$points = explode("[*]", $matches[3]);
array_shift($points);
for ($i = 0; $i < count($points); $i++) {
$nls = split("[\n]", $points[$i]);
$brs = count($nls) - 2;
$points[$i] = preg_replace("[\r\n]", "<br />", $points[$i], $brs);
}
$replace = ($matches[2] != '1') ? ($matches[2] != 'a') ? '<ul>' : '<ol style="list-style:lower-alpha">' : '<ol style="list-style:decimal">';
$replace .= "<li>";
$replace .= implode("</li><li>", $points);
$replace .= "</li>";
$replace .= ($matches[2] == '1' || $matches[2] == 'a' ) ? '</ol>' : '</ul>';
$text = preg_replace($pattern, $replace, $text, 1);
$text = preg_replace("[\r\n]", "", $text);
}
return $text;
}
function bbcode_parse($text) {
$text = preg_replace("[\r\n]", "<br />", $text);
$smilies = Array(
':)' => 'smile.gif',
':d' => 'tongue2.gif',
':P' => 'tongue.gif',
':lol:' => 'lol.gif',
':D' => 'biggrin.gif',
';)' => 'wink.gif',
':zzz:' => 'zzz.gif',
':confused:' => 'confused.gif'
);
foreach ($smilies as $key => $value) {
$text = str_replace($key, '<img src="/images/smilies/' . $value . '" alt="' . $key . '" />', $text);
}
if (!(!strpos($text, "[") && !strpos($text, "]"))) {
$bbcodes = Array(
'#\[b\](.*?)\[/b\]#si' => '<strong>$1</strong>',
'#\[i\](.*?)\[/i\]#si' => '<em>$1</em>',
'#\[u\](.*?)\[/u\]#si' => '<span class="u">$1</span>',
'#\[s\](.*?)\[/s\]#si' => '<span class="s">$1</span>',
'#\[size=(.*?)\](.*?)\[/size\]#si' => '<span style="font-size:$1">$2</span>',
'#\[color=(.*?)\](.*?)\[/color\]#si' => '<span style="color:$1">$2</span>',
'#\[url=(.*?)\](.*?)\[/url\]#si' => '<a href="$1" target="_blank">$2</a>',
'#\[url\](.*?)\[/url\]#si' => '<a href="$1" target="_blank">$1</a>',
'#\[img\](.*?)\[/img\]#si' => '<img src="$1" alt="" />',
'#\[code\](.*?)\[/code\]#si' => '<div class="code">$1</div>'
);
$text = preg_replace(array_keys($bbcodes), $bbcodes, $text);
$text = bbcode_lists($text);
$quote_code = Array("'\[quote=(.*?)\](.*?)'i", "'\[quote](.*?)'i", "'\[/quote\]'i");
$quote_html = Array('<blockquote><p class="quotetitle">Quote \1:</p>\2', '<blockquote>\2', '</blockquote>');
$text = preg_replace($quote_code, $quote_html, $text);
}
return $text;
}
?>
basically,
preg_replace_callback('~\[tag\](.+?)\[/tag\]~', function($matches) { whatever }, $text);
this doesn't handle nested tags though
complete example
$text = "hello [xcode] <? echo bar ?> [/xcode] world";
echo preg_replace_callback(
'~\[xcode\](.+?)\[/xcode\]~',
function($matches) {
return highlight_string($matches[1], 1);
},
$text
);
<?php
$string = 'The quick brown fox jumped over the lazy dog.';
$patterns = array();
$patterns[0] = '/quick/';
$patterns[1] = '/brown/';
$patterns[2] = '/fox/';
$replacements = array();
$replacements[2] = 'bear';
$replacements[1] = 'black';
$replacements[0] = 'slow';
echo preg_replace($patterns, $replacements, $string);
?>
The above example will output:
The bear black slow jumped over the lazy dog.
http://php.net/manual/en/function.preg-replace.php
OR
str_replace should help you
Thanks to user187291's suggestion and preg_replace_callback specification I've ended up with the following outcome which does the job spot on! :
function parseTagsRecursive($input)
{
$regex = '~\[xcode\](.+?)\[/xcode\]~';
if (is_array($input)) {
$input = highlight_string($input[1], true);
}
return preg_replace_callback($regex, 'parseTagsRecursive', $input);
}
$text = "hello [xcode] <? echo bar ?> [/xcode] world and [xcode] <?php phpinfo(); ?> [/xcode]";
echo parseTagsRecursive($text);
The output of parsing the $text variable through this function is:
hello <? echo bar ?> world and <?php phpinfo(); ?>
Thank you everyone for input!
