<?php

$PHP_SELF = htmlspecialchars($_SERVER['PHP_SELF'], ENT_QUOTES, "utf-8");

#
# Returns TRUE if browser is Internet Explorer.
#
function isIE() {
	global $_SERVER;
	return strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE');
}

function isKonq() {
	global $_SERVER;
	return strstr($_SERVER['HTTP_USER_AGENT'], 'Konqueror');
}

function isMoz() {
	global $_SERVER;
	return strstr($_SERVER['HTTP_USER_AGENT'], 'Gecko');
}


#
# Force upload of specified file to browser.
#
function upload($source, $destination, $content_type="application/octet-stream") {
	header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); 
	header("Expires: -1");
#	header("Cache-Control: no-store, no-cache, must-revalidate");
#	header("Cache-Control: post-check=0, pre-check=0", false);
#	header("Pragma: no-cache");
    header("Content-Type: $content_type");

	if (is_array($source)) {
		$fsize = 0;
		foreach($source as $f) $fsize += filesize($f);
	}
	else {
		$fsize = filesize($source);
	}

	header("Content-length: " . $fsize);
#        header("Content-Disposition: attachment; filename=\"" . $destination ."\"");
        header("Content-Disposition: filename=\"" . $destination ."\"");

	if (is_array($source))
		foreach($source as $f) $ret = readfile($f);
	else 
        	$ret=readfile($source);

#        $fd=fopen($source,'r');
#        fpassthru($fd);
#        fclose($fd);
}


#
# Returns a value from the GET/POST global array referenced
# by field name.  POST fields have precedence over GET fields.
# Quoting/Slashes are stripped if magic quotes gpc is on.
#
function gpvar($v) {
	global $_GET, $_POST;
    $x = "";
	if (isset($_GET[$v]))  $x = $_GET[$v];
	if (isset($_POST[$v])) $x = $_POST[$v];
	if (get_magic_quotes_gpc()) $x = stripslashes($x);
	return $x;
}


#
# Sort a two multidimensional array by one of it's columns
#
function csort($array, $column, $ascdec=SORT_ASC){    

    if (sizeof($array) == 0) return $array;

    // Sort by digital date rather than text date
    if ($column == 'issued') $column = "issuedSort";
    if ($column == 'expires') $column = 'expiresSort';
    
    if ($column == 'status') {
		foreach($array as $x) {
			$sortarr[]=$x[$column];
			$sortdate[] = $x['expiresSort'];
		}
        array_multisort($sortarr, $ascdec, $sortdate, SORT_ASC, $array);
    } else {
        foreach($array as $x) $sortarr[]=$x[$column];
        array_multisort($sortarr, $ascdec, $array);
    }
    return $array;
}


#
# Returns a value suitable for display in the browser.
# Strips slashes if second argument is true.
#
function htvar($v, $strip=false) {
	if ($strip) 
		return  htmlentities(stripslashes($v), 0, "UTF-8");
	else
		return  htmlentities($v, 0, "UTF-8");
}


#
# Returns a value suitable for use as a shell argument.
# Strips slashes if magic quotes is on, surrounds
# provided strings with single-quotes and quotes any
# other dangerous characters.
#
function escshellarg($v, $strip=false) {
	if ($strip)
		return escapeshellarg(stripslashes($v));
	else
		return escapeshellarg($v);
}


#
# Similar to escshellarg(), but doesn't surround provided
# string with single-quotes.
#
function escshellcmd($v, $strip=false) {
	if ($strip)
		return escapeshellcmd(stripslashes($v));
	else
		return escapeshellarg($v);
}
	
#
# Recursively strips slashes from a string or array.
#
function stripslashes_array(&$a) {
	if (is_array($a)) {
		foreach($a as $k => $v) {
			my_stripslashes($a[$k]);
		}
	}
	else {
		$a = stripslashes($a);
	}
}


#
# Don't use this.
#
function undo_magic_quotes(&$a) {
	if(get_magic_quotes_gpc()) {
		global $HTTP_POST_VARS, $HTTP_GET_VARS;

		foreach($HTTP_POST_VARS as $k => $v) {
			stripslashes_array($HTTP_POST_VARS[$k]);
			global $$k;
			stripslashes_array($$k);
		}
		foreach($HTTP_GET_VARS as $k => $v) {
			stripslashes_array($HTTP_GET_VARS[$k]);
			global $$k;
			stripslashes_array($$k);
		}
	}
}

#
# Returns TRUE if argument contains only alphabetic characters.
#
function is_alpha($v) {
	#return (eregi('[^A-Z]',$v) ? false : true) ;
	#return (preg_match('/[^A-Z]'.'/i',$v,PCRE_CASELESS) ? false : true) ; # Replaced eregi() with preg_match()
	return (preg_match('/[^A-Z]/i',$v) ? false : true) ;
}

#
# Returns TRUE if argument contains only numeric characters.
#
function is_num($v) {
	#return (eregi('[^0-9]',$v) ? false : true) ;
	return (preg_match('/[^0-9]/',$v) ? false : true) ; # Replaced eregi() with preg_match()
}

#
# Returns TRUE if argument contains only alphanumeric characters.
#
function is_alnum($v) {
	#return (eregi('[^A-Z0-9]',$v) ? false : true) ;
	return (preg_match('/[^A-Z0-9]/i',$v) ? false : true) ; # Replaced eregi() with preg_match()
}

#
# Returns TRUE if argument is in proper e-mail address format.
#
function is_email($v) {
	#return (eregi('^[^@ ]+\@[^@ ]+\.[A-Z]{2,4}$',$v) ? true : false);
	return (preg_match('/^[^@ ]+\@[^@ ]+\.[A-Z]{2,4}$'.'/i',$v) ? true : false); # Replaced eregi() with preg_match()
}

#
# Returns True if the given string is a IP address
#
function is_ip( $ip = null ) {
    if( !$ip or strlen(trim($ip)) == 0){
        return false;
    }
    $ip=trim($ip);
    if(preg_match("/^[0-9]{1,3}(.[0-9]{1,3}){3}$/",$ip)) {
        foreach(explode(".", $ip) as $block)
            if($block<0 || $block>255 )
                return false;
        return true;
    }
    return false;
}

#
# Returns True if the given string is a valid FQDN
#
function is_fqdn($FQDN) {
    // remove leading wildcard characters if exist
    $FQDN = preg_replace('/^\*\./','', $FQDN, 1);
    return (!empty($FQDN) && preg_match('/^(?=.{1,254}$)((?=[a-z0-9-]{1,63}\.)(xn--+)?[a-z0-9]+(-[a-z0-9]+)*\.)+(xn--+)?[a-z0-9]{2,63}$/i', $FQDN) > 0);
}

#
# Checks regexp in every element of an array, returns TRUE as soon
# as a match is found.
#

function eregi_array($regexp, $arr) {

	foreach ($arr as $elem) {
		#if (eregi($regexp,$elem))
		if (! preg_match('/^\/.*\/$/', $regexp)) # if it doesn't begin and end with '/'
			$regexp = '/'.$regexp.'/'; # pad the $regexp with '/' to prepare for preg_match()
		if (preg_match($regexp.'i',$elem)) # Replaced eregi() with preg_match()
			return true;
	}
	return false;
}
#
# Reads entire file into a string
# Same as file_get_contents in php >= 4.3.0
#
function my_file_get_contents($f) {
	return implode('', file($f));
}

function getOSInformation() {
    if (false == function_exists("shell_exec")) {
        return null;
    }
    $os = shell_exec('cat /etc/redhat-release');
    if (preg_match('/^SME Server/', $os)) {
        return true;
    } else {
        return null;
    }
}
?>