10 More Useful PHP Codes

http://www.learncomputer.com/10-useful-php-code-snippets/

function getRemoteIPAddress() {
    $ip = $_SERVER['REMOTE_ADDR'];
    return $ip;
}

function getRealIPAddress() {
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) { // check ip from share internet
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { // to check ip is pass from proxy
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}

$query = "select UNIX_TIMESTAMP(date_field) as mydate from mytable where 1=1";
$records = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_array($records)) {
    echo $row;
}

function checkDateFormat($date) {
	// match the format of the date
	if (preg_match("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts)) {
		// check whether the date is valid of not
		if (checkdate($parts[2], $parts[3], $parts[1])) {
			return true;
		} else {
			return false;
		}
	} else {
		return false;
	}
}

header('Location: http://www.oschina.net/project/zh');

$to = "someone@oschina.net";
$subject = "Your Subject here";
$body = "Body of your message here you can use HTML too. e.g.  Bold ";
$headers = "From: Yourn";
$headers .= "Reply-To: info@yoursite.comrn";
$headers .= "Return-Path: info@yoursite.comrn";
$headers .= "X-Mailer: PHPn";
$headers .= 'MIME-Version: 1.0' . "n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn";
mail($to, $subject, $body, $headers);

function base64url_encode($plainText) {
    $base64 = base64_encode($plainText);
    $base64url = strtr($base64, '+/=', '-_,');
    return $base64url;
}

function base64url_decode($plainText) {
    $base64url = strtr($plainText, '-_,', '+/=');
    $base64 = base64_decode($base64url);
    return $base64;
}

$json_data = array ('id'=>1,'name'=>"John",'country'=>'Canada',"work"=>array("Google","Oracle"));
echo json_encode($json_data);

$json_string='{"id":1,"name":"John","country":"Canada","work":["Google","Oracle"]} ';
$obj=json_decode($json_string);

// print the parsed data
echo $obj->name; //displays John
echo $obj->work[0]; //displays Google

$useragent = $_SERVER ['HTTP_USER_AGENT'];
echo "Your User Agent is: " . $useragent;

$lines = file('http://www.oschina.net/home/about');
foreach ($lines as $line_num => $line) {
	// loop thru each line and prepend line numbers
	echo "Line #{$line_num} : " . htmlspecialchars($line) . "n";
}

$now = date('Y-m-d-G');
$now = strftime("%Y-%m-%d-%H", strtotime("$now -8 hours"));