WordPress/wp-includes/vars.php

<?php

// On which page are we ?
if (preg_match('#([^/]+\.php)$#', $PHP_SELF, $self_matches)) {
	$pagenow = $self_matches[1];
} else if (strstr($PHP_SELF, '?')) {
	$pagenow = explode('/', $PHP_SELF);
	$pagenow = trim($pagenow[(sizeof($pagenow)-1)]);
	$pagenow = explode('?', $pagenow);
	$pagenow = $pagenow[0];
} else {
	$pagenow = 'index.php';
}

// Simple browser detection
$is_lynx = 0; $is_gecko = 0; $is_winIE = 0; $is_macIE = 0; $is_opera = 0; $is_NS4 = 0;

if (preg_match('/Lynx/', $_SERVER['HTTP_USER_AGENT'])) {
	$is_lynx = 1;
} elseif (preg_match('/Gecko/', $_SERVER['HTTP_USER_AGENT'])) {
	$is_gecko = 1;
} elseif ((preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) && (preg_match('/Win/', $_SERVER['HTTP_USER_AGENT']))) {
	$is_winIE = 1;
} elseif ((preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) && (preg_match('/Mac/', $_SERVER['HTTP_USER_AGENT']))) {
	$is_macIE = 1;
} elseif (preg_match('/Opera/', $_SERVER['HTTP_USER_AGENT'])) {
	$is_opera = 1;
} elseif ((preg_match('/Nav/', $_SERVER['HTTP_USER_AGENT']) ) || (preg_match('/Mozilla\/4\./', $_SERVER['HTTP_USER_AGENT']))) {
	$is_NS4 = 1;
}
$is_IE    = (($is_macIE) || ($is_winIE));

// Server detection
$is_apache = ( strstr($_SERVER['SERVER_SOFTWARE'], 'Apache') || strstr($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') ) ? 1 : 0;
$is_IIS = strstr($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') ? 1 : 0;

// if the config file does not provide the smilies array, let's define it here
if (!isset($wpsmiliestrans)) {
	$wpsmiliestrans = array(
	':mrgreen:'	=> 'icon_mrgreen.gif',
	':neutral:'	=> 'icon_neutral.gif',
	':twisted:'	=> 'icon_twisted.gif',
	':arrow:'	=> 'icon_arrow.gif',
	':shock:'	=> 'icon_eek.gif',
	':smile:'	=> 'icon_smile.gif',
	':???:'	=> 'icon_confused.gif',
	':cool:'	=> 'icon_cool.gif',
	':evil:'	=> 'icon_evil.gif',
	':grin:'	=> 'icon_biggrin.gif',
	':idea:'	=> 'icon_idea.gif',
	':oops:'	=> 'icon_redface.gif',
	':razz:'	=> 'icon_razz.gif',
	':roll:'	=> 'icon_rolleyes.gif',
	':wink:'	=> 'icon_wink.gif',
	':cry:'		=> 'icon_cry.gif',
	':eek:'		=> 'icon_surprised.gif',
	':lol:'		=> 'icon_lol.gif',
	':mad:'		=> 'icon_mad.gif',
	':sad:'		=> 'icon_sad.gif',
	'8-)'		=> 'icon_cool.gif',
	'8-O'		=> 'icon_eek.gif',
	':-('		=> 'icon_sad.gif',
	':-)'		=> 'icon_smile.gif',
	':-?'		=> 'icon_confused.gif',
	':-D'		=> 'icon_biggrin.gif',
	':-P'		=> 'icon_razz.gif',
	':-o'		=> 'icon_surprised.gif',
	':-x'		=> 'icon_mad.gif',
	':-|'		=> 'icon_neutral.gif',
	';-)'		=> 'icon_wink.gif',
	'8)'		=> 'icon_cool.gif',
	'8O'		=> 'icon_eek.gif',
	':('		=> 'icon_sad.gif',
	':)'		=> 'icon_smile.gif',
	':?'		=> 'icon_confused.gif',
	':D'		=> 'icon_biggrin.gif',
	':P'		=> 'icon_razz.gif',
	':o'		=> 'icon_surprised.gif',
	':x'		=> 'icon_mad.gif',
	':|'		=> 'icon_neutral.gif',
	';)'		=> 'icon_wink.gif',
	':!:'		=> 'icon_exclaim.gif',
	':?:'		=> 'icon_question.gif',
	);
}


// generates smilies' search & replace arrays
foreach($wpsmiliestrans as $smiley => $img) {
	$wp_smiliessearch[] = '/(\s|^)'.preg_quote($smiley, '/').'(\s|$)/';
	$smiley_masked = htmlspecialchars( trim($smiley) , ENT_QUOTES);
	$wp_smiliesreplace[] = " <img src='" . get_option('siteurl') . "/wp-includes/images/smilies/$img' alt='$smiley_masked' class='wp-smiley' /> ";
}

?>