Codes Hub : PHP & JS Useful Codes [ Part 1 ]

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PHP CODE FOR DATABASE CONNECTION

To store data, you would need a database. In this case we would be using MySQL database.

$DBNAME = 'koonk';

$HOST = 'localhost';

$DBUSER = 'root';

$DBPASS = 'koonk';

$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);

if(!$CONNECT)

{

echo 'MySQL Error: '.mysql_error();

}

$SELECT = mysql_select_db($DBNAME);

if(!$SELECT)

{

echo 'MySQL Error: '.mysql_error();

}

?>

In the red lines above, you would have to specify your own server database details.

You can save the above file as config.php and you would have to include that file in all pages where you need database connectivity.

PHP CODE FOR DIRECTORY LISTING

Using the below PHP code snippet you would be able to list all files and folders in a directory.

function list_files($dir)

{

    if(is_dir($dir))

    {

        if($handle = opendir($dir))

        {

            while(($file = readdir($handle)) !== false)

            {

                if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)

                {

                    echo ''.$file.'
'."\n";

                }

            }

            closedir($handle);

        }

    }

}

Syntax

    list_files("images/"); //This will list all files of images folder

?>

SENDING SMS

While working on web or mobile applications, you often face a situation where you need to send an SMS to your user either for login purposes or providing them with some information. The below PHP function would help you with it.

For sending SMS using any language, you’d need an SMS gateway. Most of the SMS providers these days provide with an API. For the below PHP snippet, I am using MSG91 as SMS gateway. You can use iTextMo if you are in Asia or the Philippines

function send_sms($mobile,$msg)
{
$authKey = "XXXXXXXXXXX";
date_default_timezone_set("Asia/Kolkata");
$date = strftime("%Y-%m-%d %H:%M:%S");
//Multiple mobiles numbers separated by comma
$mobileNumber = $mobile;

//Sender ID,While using route4 sender id should be 6 characters long.
$senderId = "IKOONK";

//Your message to send, Add URL encoding here.
$message = urlencode($msg);

//Define route 
$route = "template";
//Prepare you post parameters
$postData = array(
    'authkey' => $authKey,
    'mobiles' => $mobileNumber,
    'message' => $message,
    'sender' => $senderId,
    'route' => $route
);

//API URL
$url="https://control.msg91.com/sendhttp.php";

// init the resource
$ch = curl_init();
curl_setopt_array($ch, array(
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $postData
    //,CURLOPT_FOLLOWLOCATION => true
));


//Ignore SSL certificate verification
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);


//get response
$output = curl_exec($ch);

//Print error if any
if(curl_errno($ch))
{
    echo 'error:' . curl_error($ch);
}

curl_close($ch);
}

You’d see that I have highlighted two lines. On the first highlighted line you need to enter your passkey and on the second you need to enter your senderID. While entering mobile number you need to specify the country code (For example, USA’s country code is 1. Philippine's country code is 63).

Syntax:


$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);



SENDING EMAIL USING NATIVE PHP AND JS

 

or

or the w3schools version

  
SENDING EMAIL WITH MANDRILL

Mandrill is a powerful SMTP provider. Developers tend to use a third party SMTP provider for better inbox deliveries.


For the below function you would have to put a file “Mandrill.php” in the same folder as the PHP file you would be using to send emails.

function send_email($to_email,$subject,$message1)
{
require_once 'Mandrill.php';
$apikey = 'XXXXXXXXXX'; //specify your api key here
$mandrill = new Mandrill($apikey);

$message = new stdClass();
$message->html = $message1;
$message->text = $message1;
$message->subject = $subject;
$message->from_email = "blog@koonk.com";//Sender Email
$message->from_name  = "KOONK";//Sender Name
$message->to = array(array("email" => $to_email));
$message->track_opens = true;

$response = $mandrill->messages->send($message);

}

In the above code you would have to specify your own api key that you get from your Mandrill account.


Syntax


$to = "abc@example.com";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$subject,$message);

?>

PHP FUNCTION TO HELP PREVENT SQL INJECTION


SQL injection or SQLi is a common technique used to hack into a website. Using the below code can help you prevent it.

function clean($input)

{

if (is_array($input))

{

foreach ($input as $key => $val)

{

$output[$key] = clean($val);

// $output[$key] = $this->clean($val);

}

}

else

{

$output = (string) $input;

// if magic quotes is on then use strip slashes

if (get_magic_quotes_gpc()) 

{

$output = stripslashes($output);

}

// $output = strip_tags($output);

$output = htmlentities($output, ENT_QUOTES, 'UTF-8');

}

// return the clean text

return $output;


}

Syntax


$text = "";
$text = clean($text);
echo $text;

?>

Had we not used the clean function above, the page would have popped up an alert box.

DETECT LOCATION OF THE USER

Using the below function you can check the city from which the user is visiting your website.

function detect_city($ip) {
        
        $default = 'UNKNOWN';

        $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';
        
        $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
        $ch = curl_init();
        
        $curl_opt = array(
            CURLOPT_FOLLOWLOCATION  => 1,
            CURLOPT_HEADER      => 0,
            CURLOPT_RETURNTRANSFER  => 1,
            CURLOPT_USERAGENT   => $curlopt_useragent,
            CURLOPT_URL       => $url,
            CURLOPT_TIMEOUT         => 1,
            CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],
        );
        
        curl_setopt_array($ch, $curl_opt);
        
        $content = curl_exec($ch);
        
        if (!is_null($curl_info)) {
            $curl_info = curl_getinfo($ch);
        }
        
        curl_close($ch);
        
        if ( preg_match('{


City : ([^<]*)
}i', $content, $regs) )  {
            $city = $regs[1];
        }
        if ( preg_match('{
State/Province : ([^<]*)
}i', $content, $regs) )  {
            $state = $regs[1];
        }

        if( $city!='' && $state!='' ){
          $location = $city . ', ' . $state;
          return $location;
        }else{
          return $default; 
        }
       
    }
Syntax


$ip = $_SERVER['REMOTE_ADDR'];
$city = detect_city($ip);
echo $city;
?>

VALIDATE EMAIL ADDRESS


Sometimes, while filling forms on your website, a user can mistype his email address. Using the below function you can check if the email provided by user is in correct format

function is_validemail($email)
{
$check = 0;
if(filter_var($email,FILTER_VALIDATE_EMAIL))
{
$check = 1;
}
return $check;

}

Syntax


$email = "blog@koonk.com";
$check = is_validemail($email);
echo $check;
// If the output is 1, then email is valid.
?>

GET REAL IP ADDRESS OF USER

function getRealIpAddr()  
{  
    if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))  
    {  
        $ip=$_SERVER['HTTP_CLIENT_IP'];  
    }  
    elseif (!emptyempty($_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;  

}

Syntax

$ip = getRealIpAddr();
echo $ip;
?>

CONVERT URL IN A STRING TO HYPERLINKS

If you are working with forums, blogs or even a normal form submission, many times you end us asking user for a website. Using the function, the URL string would automatically convert to a hyperlink.


function makeClickableLinks($text) 
{  
 $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',  
 '\1', $text);  
 $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',  
 '\1\2', $text);  
 $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',  
 '\1', $text);  
  
return $text;  
}


Syntax


$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>

BLOCK MULTIPLE IP FROM ACCESSING YOUR WEBSITE


This snippet can come in handy if you want to restrict your website from a certain location or from certain users.

if ( !file_exists('blocked_ips.txt') ) {
 $deny_ips = array(
  '127.0.0.1',
  '192.168.1.1',
  '83.76.27.9',
  '192.168.1.163'
 );
} else {
 $deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
$ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips))!== FALSE ) {
 // address is blocked:
 echo 'Your IP adress ('.$ip.') was blocked!';
 exit;
}


FORCEFUL DOWNLOADING OF FILE

If you want certain files to download instead of opening in new tab, you can use the below snippet.


function force_download($file) 
{ 
    $dir      = "../log/exports/"; 
    if ((isset($file))&&(file_exists($dir.$file))) { 
       header("Content-type: application/force-download"); 
       header('Content-Disposition: inline; filename="' . $dir.$file . '"'); 
       header("Content-Transfer-Encoding: Binary"); 
       header("Content-length: ".filesize($dir.$file)); 
       header('Content-Type: application/octet-stream'); 
       header('Content-Disposition: attachment; filename="' . $file . '"'); 
       readfile("$dir$file"); 
    } else { 
       echo "No file selected"; 
    } 

}

Syntax


force_download("image.jpg");

?>


PHP CODE TO RESIZE IMAGE

Sometimes client can upload a large image and you might want to resize it. Below PHP snippet would enable you to do that.

function resize_image($filename, $tmpname, $xmax, $ymax)  
{  
    $ext = explode(".", $filename);  
    $ext = $ext[count($ext)-1];  
  
    if($ext == "jpg" || $ext == "jpeg")  
        $im = imagecreatefromjpeg($tmpname);  
    elseif($ext == "png")  
        $im = imagecreatefrompng($tmpname);  
    elseif($ext == "gif")  
        $im = imagecreatefromgif($tmpname);  
      
    $x = imagesx($im);  
    $y = imagesy($im);  
      
    if($x <= $xmax && $y <= $ymax)  
        return $im;  
  
    if($x >= $y) {  
        $newx = $xmax;  
        $newy = $newx * $y / $x;  
    }  
    else {  
        $newy = $ymax;  
        $newx = $x / $y * $newy;  
    }  
      
    $im2 = imagecreatetruecolor($newx, $newy);  
    imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);  
    return $im2;   

}

SEND EMAIL USING MAIL()


Above we have discussed how you can send email using Mandrill, but in case you do not want to use a third party service, you can use the below snippet.

function send_mail($to,$subject,$body)
{
$headers = "From: KOONK\r\n";
$headers .= "Reply-To: blog@koonk.com\r\n";
$headers .= "Return-Path: blog@koonk.com\r\n";
$headers .= "X-Mailer: PHP5\n";
$headers .= 'MIME-Version: 1.0' . "\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to,$subject,$body,$headers);

}
Syntax


$to = "admin@koonk.com";
$subject = "This is a test mail";
$body = "Hello World!";
send_mail($to,$subject,$body);
?>

READING A CSV FILE

function readCSV($csvFile){
$file_handle = fopen($csvFile, 'r');
while (!feof($file_handle) ) {
$line_of_text[] = fgetcsv($file_handle, 1024);
}
fclose($file_handle);
return $line_of_text;
}

Syntax

$csvFile = "test.csv";
$csv = readCSV($csvFile);
$a = csv[0][0]; // This will get value of Column 1 & Row 1

?>

CREATING A CSV FILE FROM PHP ARRAY

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
   $handle = fopen('php://temp', 'r+');
   foreach ($data as $line) {
  fputcsv($handle, $line, $delimiter, $enclosure);
   }
   rewind($handle);
   while (!feof($handle)) {
  $contents .= fread($handle, 8192);
   }
   fclose($handle);
   return $contents;

}

Syntax


$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data, $delimiter = ',', $enclosure = '"');

?>

GET LATEST TWEET FROM ANY TWITTER ACCOUNT

function my_twitter($username) 
{
  $no_of_tweets = 1;
  $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
  $xml = simplexml_load_file($feed);
foreach($xml->children() as $child) {
foreach ($child as $value) {
if($value->getName() == "link") $link = $value['href'];
if($value->getName() == "content") {
$content = $value . "";
echo '

'.$content.'  

';
}
}
}

}

Syntax


$handle = "koonktech";
my_twitter($handle);
?>

CALCULATE DIFFERENCE IN 2 DATES



$date1 = date( 'Y-m-d' );
$date2 = "2015-12-04";

$diff = abs(strtotime($date2) - strtotime($date1));

$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));

printf("%d years, %d months, %d days\n", $years, $months, $days);

-------------------------------------------------------- OR


$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; 

// shows the total amount of days (not divided into years, months and days like above)
echo "difference " . $interval->days . " days ";


-------------------------------------------------------- OR
    
    
/**
 * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
 * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
 * 
 * See here for original code:
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
 */

function _date_range_limit($start, $end, $adj, $a, $b, $result)
{
    if ($result[$a] < $start) {
        $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
        $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
    }

    if ($result[$a] >= $end) {
        $result[$b] += intval($result[$a] / $adj);
        $result[$a] -= $adj * intval($result[$a] / $adj);
    }

    return $result;
}

function _date_range_limit_days($base, $result)
{
    $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

    _date_range_limit(1, 13, 12, "m", "y", &$base);

    $year = $base["y"];
    $month = $base["m"];

    if (!$result["invert"]) {
        while ($result["d"] < 0) {
            $month--;
            if ($month < 1) {
                $month += 12;
                $year--;
            }

            $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];

            $result["d"] += $days;
            $result["m"]--;
        }
    } else {
        while ($result["d"] < 0) {
            $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];

            $result["d"] += $days;
            $result["m"]--;

            $month++;
            if ($month > 12) {
                $month -= 12;
                $year++;
            }
        }
    }

    return $result;
}

function _date_normalize($base, $result)
{
    $result = _date_range_limit(0, 60, 60, "s", "i", $result);
    $result = _date_range_limit(0, 60, 60, "i", "h", $result);
    $result = _date_range_limit(0, 24, 24, "h", "d", $result);
    $result = _date_range_limit(0, 12, 12, "m", "y", $result);

    $result = _date_range_limit_days(&$base, &$result);

    $result = _date_range_limit(0, 12, 12, "m", "y", $result);

    return $result;
}

/**
 * Accepts two unix timestamps.
 */
function _date_diff($one, $two)
{
    $invert = false;
    if ($one > $two) {
        list($one, $two) = array($two, $one);
        $invert = true;
    }

    $key = array("y", "m", "d", "h", "i", "s");
    $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
    $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));

    $result = array();
    $result["y"] = $b["y"] - $a["y"];
    $result["m"] = $b["m"] - $a["m"];
    $result["d"] = $b["d"] - $a["d"];
    $result["h"] = $b["h"] - $a["h"];
    $result["i"] = $b["i"] - $a["i"];
    $result["s"] = $b["s"] - $a["s"];
    $result["invert"] = $invert ? 1 : 0;
    $result["days"] = intval(abs(($one - $two)/86400));

    if ($invert) {
        _date_normalize(&$a, &$result);
    } else {
        _date_normalize(&$b, &$result);
    }

    return $result;
}

$date = "2014-12-04 19:37:22";

echo '

';

print_r( _date_diff( strtotime($date), time() ) );
echo '
'; 
?>

PHP SNIPPET TO DELETE A FOLDER WITH CONTENT


function Delete($path)
{
    if (is_dir($path) === true)
    {
        $files = array_diff(scandir($path), array('.', '..'));

        foreach ($files as $file)
        {
            Delete(realpath($path) . '/' . $file);
        }

        return rmdir($path);
    }

    else if (is_file($path) === true)
    {
        return unlink($path);
    }

    return false;
}

Syntax


$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>

SEARCH AND HIGHLIGHT KEYWORDS IN A STRING


It becomes convenient for user, when he searches something and in the result he can see his keyword highlighted.

function highlighter_text($text, $words)
{
    $split_words = explode( " " , $words );
    foreach($split_words as $word)
    {
        $color = "#4285F4";
        $text = preg_replace("|($word)|Ui" ,
            "$1" , $text );
    }
    return $text;

}

Syntax

$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string ,$words);

?>

DOWNLOAD IMAGE FROM URL

Most of the websites now give you an option to either upload image or download it from a URL. Ever wondered how they copy that image from that URL? Here is how

function imagefromURL($image,$rename)
{
$ch = curl_init($image);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$rawdata=curl_exec ($ch);
curl_close ($ch);

$fp = fopen("$rename",'w');
fwrite($fp, $rawdata); 
fclose($fp);
}

Syntax


$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>

GENERATE QR CODE

function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')  
{
     $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
    if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
    {
        $type = "TXT";
    }
    if (!preg_match('/^'.$types[$type].'/', $data))
    {
        $data = str_replace("\\", "", $types[$type]).$data;
    }
    $ch = curl_init();
    $data = urlencode($data);
    curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);

    $response = curl_exec($ch);

    curl_close($ch);
    return $response;

}

Syntax


header("Content-type: image/png");
echo qr_code("http://koonk.com", "URL");

?>

CALCULATE DISTANCE BETWEEN TWO MAP COORDINATES

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    $feet = $miles * 5280;
    $yards = $feet / 3;
    $kilometers = $miles * 1.609344;
    $meters = $kilometers * 1000;
    return compact('miles','feet','yards','kilometers','meters'); 

}

Syntax


$point1 = array('lat' => 40.770623, 'long' => -73.964367);
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
foreach ($distance as $unit => $value) {
    echo $unit.': '.number_format($value,4).'
';
}

?>

GET ALL TWEETS OF A SPECIFIC HASHTAG

function getTweets($hash_tag) {

    $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
    echo "Connecting to $url ...
";
    $ch = curl_init($url);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
    $xml = curl_exec ($ch);
    curl_close ($ch);

    //If you want to see the response from Twitter, uncomment this next part out:
    //echo "Response:
";
    //echo "

".htmlspecialchars($xml)."

";

    $affected = 0;
    $twelement = new SimpleXMLElement($xml);
    foreach ($twelement->entry as $entry) {
        $text = trim($entry->title);
        $author = trim($entry->author->name);
        $time = strtotime($entry->published);
        $id = $entry->id;
        echo "Tweet from ".$author.": ".$text."  Posted ".date('n/j/y g:i a',$time)."
";
    }

    return true ;

}

ADD TH,ST,ND OR RD TO THE END OF A NUMBER


Friday the 13th

function ordinal($cdnl){ 
    $test_c = abs($cdnl) % 10; 
    $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th' 
            : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
            ? 'th' : 'st' : 'nd' : 'rd' : 'th')); 
    return $cdnl.$ext; 
}

Syntax


$number = 10;
echo ordinal($number); //output is 10th

?>

CONVERT TEXT TO IMAGE


header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im, 255, 255, 255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;

imagestring($im, fontSize, $px, $py, $string, $color);
imagepng($im);
imagedestroy($im);

?>
PDF TO IMAGE CONVERTER WITH IMAGEBRICK


$pdf_file   = './pdf/demo.pdf';
$save_to    = './jpg/demo.jpg';     //make sure that apache has permissions to write in this folder! (common problem)

//execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);


if($return_var == 0) {              //if exec successfuly converted pdf to jpg
    print "Conversion OK";
}
else print "Conversion failed.
".$output;

?>

YOUTUBE DOWNLOAD LINK GENERATOR

function str_between($string, $start, $end)
{ 
$string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
function get_youtube_download_link(){
$youtube_link = $_GET['youtube'];
$youtube_page = file_get_contents($youtube_link);
$v_id = str_between($youtube_page, "&video_id=", "&");
$t_id = str_between($youtube_page, "&t=", "&");
$flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
$hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
$mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
$threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
echo "\t\tDownload (right-click > save as):\n\t\t";
echo "FLV\n\t\t";
echo "HQ FLV (if available)\n\t\t";
echo "MP4\n\t\t";
echo "3GP

\n";

}

FACEBOOK STYLE TIMESTAMP


Ever noticed how your post/comment time is shown on Facebook (x mins age, y hours ago etc). Below is a simple PHP snippet which you can use that will do the same thing.

function nicetime($date)
{
    if(empty($date)) {
        return "No date provided";
    }
    
    $periods         = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
    $lengths         = array("60","60","24","7","4.35","12","10");
    
    $now             = time();
    $unix_date         = strtotime($date);
    
       // check validity of date
    if(empty($unix_date)) {    
        return "Bad date";
    }

    // is it future date or past date
    if($now > $unix_date) {    
        $difference     = $now - $unix_date;
        $tense         = "ago";
        
    } else {
        $difference     = $unix_date - $now;
        $tense         = "from now";
    }
    
    for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
        $difference /= $lengths[$j];
    }
    
    $difference = round($difference);
    
    if($difference != 1) {
        $periods[$j].= "s";
    }
    
    return "$difference $periods[$j] {$tense}";

}

Syntax


$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago

?>

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