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Valeri Tandilashvili's PHP Notes
Results: 135
__destruct CODE
Magic method 
__destruct
gets called when we delete an object manually. If we don't delete the object during the code execution, it will be called automatically at the end of the code execution
class User {
    public $username;
    public $friends = ['Tom','David'];

    function __construct($name) {
        $this->username = $name;
        print $this->username . "'s object is created'\n";
    }

    function __destruct() {
        print $this->username . "'s object is deleted'\n";
    }
}
$user1 = new User('George');
$user2 = new User('David');
echo $user1->username . "\n";
__construct CODE
Magic method 
__construct
gets called when a new object of the class gets created
class User {
    public $username;
    public $friends = ['Tom','David'];

    function __construct($name) {
        $this->username = $name;
        // print "In BaseClass constructor\n";
    }
    
    public function addFriend($friend_name) {
        $this->friends[] = $friend_name;
    }
}
$user1 = new User('George');
echo $user1->username;
get_class_methods CODE
Returns a list of methods of the class being passed to the function
class User {
    public $username = 'George';
    public $friends = ['Tom','David'];
    
    public function addFriend($friend_name) {
        $this->friends[] = $friend_name;
    }
}
$user1 = new User();

print_r( get_class_methods('User') );
get_class_vars CODE
Returns an array with properties of the class
class User {
    public $username;
    public $friends;
    
    public function addFriend($friend_name) {
        $this->friends[] = $friend_name;
    }
}
$user1 = new User();
print_r( get_class_vars('User') );
get_class
Returns the name of the class that is used to create the object passed to the 
get_class
function
class User {
    public $username;
    public $friends;
    
    public function addFriend($friend_name) {
        $this->friends[] = $friend_name;
    }
}
$user1 = new User();
echo get_class($user1);
train CLASS example
Properties (attributes): 
color
, 
length
, 
top speed
Methods (behavior): 
start
, 
stop
, 
accelerate
signal
PDO duplicate entry error code
We get the error code (using DB unique constraint) when the resource is already created 
try{
    $stmt = $conn->prepare($query);
    $stmt->execute($exec_arr);
} catch(PDOException $e) {
    if($e->getCode() == 23000){
        array_push($errors, 'Technology already exists');
    } else {
        array_push($errors, 'Database error');
    }
}
JSON Response encoding 
$res = preg_replace('/\\\\u([a-f0-9]{4})/e', "iconv('UCS-4LE','UTF-8',pack('V', hexdec('U$1')))", json_encode($this->response));
Modern way of doing this is:
$res = json_encode($this->response, JSON_UNESCAPED_UNICODE);
JSON_UNESCAPED_UNICODE
added in 5.4 PHP version
include resource
The statement does not work when config.php is one step out of the root directory on servage.net
include_once '../../config.php';
But works one of these lines:
include_once './../config.php';
include_once $_SERVER['DOCUMENT_ROOT'].'/../config.php';
Output of the second solution is:
/storage/content/95/1009995/test.sibrdzne.ge/public_html/../config.php
SMPP SMS-Off UTF8 Support CODE 
function getString(&$ar, $maxlen = 255, $firstRead = false, $encoding = 3)
{
	$s = "";
	$i = 0;
	$rep = 1;
	if ($encoding == 8) {
		$rep = 2;
	}
	do {
		$c = 0;
		for($rc = 0; $rc < $rep; $rc ++) {
			$c += ($firstRead && $i == 0) ? current($ar) : next($ar);
			$i++;
		}
		if ($encoding == 8) {
            if ($c >= 224 && $c <= 256) {
                $c += 4080;
            }
		}
		if ($c != 0) {
			$s .= mb_chr($c);
		}
	} while ($i < $maxlen && $c != 0);
	
	return $s;
}

$ar = unpack("C*", hex2bin('0001013939353539383235313533340000013930323237000000000000000008004a004800650079002010d010d110d210d310d410d510d610d710d810d910da10db10dc10dd10de10df10e010e110e210e310e410e510e610e710e810e910ea10eb10ec10ed10ee10ef10f00204000200a2'));

$service_type = getString($ar, 6, true); // 6

$source_addr_ton = next($ar); // 7
$source_addr_npi = next($ar); // 8
$source_addr = getString($ar, 21); // 29

$dest_addr_ton = next($ar); // 30
$dest_addr_npi = next($ar);
$destination_addr = getString($ar, 21); // 52

$esmClass = next($ar);
$protocolId = next($ar);
$priorityFlag = next($ar);
next($ar); // schedule_delivery_time
next($ar); // validity_period 
$registeredDelivery = next($ar);
next($ar); // replace_if_present_flag 
$dataCoding = next($ar); // 60
next($ar); // sm_default_msg_id 
$sm_length = next($ar);
$message = getString($ar, $sm_length, false, $dataCoding);

var_dump('encoding: '.$dataCoding, 'length: ' . $sm_length, 'msg:' . $message);
Results: 135