10 Useful PHP Code

get browser IP address

function getremoteipaddress () {

$ip = $_server[' remote_addr '];

return $IP;

}

Get IP If there is a proxy server

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 be pass from proxy

$ip = $_server[' http_x_forwarded_for '];

} else {

$ip = $_server[' remote_addr '];

}

return $IP;

}

Get MySQL timestamp

$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;

}

Validate date format: Yyyy-mm-dd

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;

}

}

redirect

Header (' location:http://www.php100.com ');

Send mail

$to = "Someone@oschina.net";

$subject = "Your subject here";

$body = "Body of your message is here for you can use HTML too." e.g.
Bold ";

$headers = "from:you\r\n";

$headers. = "reply-to:info@yoursite.com\r\n";

$headers. = "return-path:info@yoursite.com\r\n";

$headers. = "X-mailer:php\n";

$headers. = ' mime-version:1.0 '. "\ n";

$headers. = ' content-type:text/html; Charset=iso-8859-1 '. "\ r \ n";

Mail ($to, $subject, $body, $headers);

BASE64 encoding and decoding

function Base64url_encode ($plainText) {

$base = Base64_encode ($plainText);

$base 64url = STRTR ($base 64, ' +/= ', '-_, ');

return $base 64url;

}

function Base64url_decode ($plainText) {

$base 64url = STRTR ($plainText, '-_, ', ' +/= ');

$base = Base64_decode ($base 64url);

return $base 64;

}

JSON Processing

$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

Detecting user Browser types

$useragent = $_server [' http_user_agent '];

echo "Your User Agentis:". $useragent;

Display Web page source code

$lines = File (' http://www.php100.com/index.php ');

foreach ($lines as $line _num => $line) {

loop thru each line and prepend line numbers

echo "line #<b>{$line _num}</b>:". Htmlspecialchars ($line). "<br>\n";

}

Adjust server time

$now = Date (' y-m-d-g ');

$now = strftime ("%y-%m-%d-%h", Strtotime ("$now-8 hours"));