46 Very Useful PHP Code Snippets (2)-PHP Tutorial-php.cn

16. Unzip file [code] php code:

function unzip($location,$newLocation)
{
        if(exec("unzip $location",$arr)){
            mkdir($newLocation);
            for($i = 1;$i< count($arr);$i++){
                $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
                copy($location.&#39;/&#39;.$file,$newLocation.&#39;/&#39;.$file);
                unlink($location.&#39;/&#39;.$file);
            }
            return TRUE;
        }else{
            return FALSE;
        }
}

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Syntax:

unzip('test.zip','unziped/test'); //File would be unzipped in unziped/ test folder

17. Zoom image

[code]php code:

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;   
}

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18. Use mail() to send email

Before we provided PHP code snippets on how to use Mandrill to send emails, but If you don't want to use a third-party service, you can use the following PHP code snippet.

[Code]php code:

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 .= &#39;MIME-Version: 1.0&#39; . "\n";
$headers .= &#39;Content-type: text/html; charset=iso-8859-1&#39; . "\r\n";
mail($to,$subject,$body,$headers);
}

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Syntax:

$to = "admin@koonk.com";

$subject = "This is a test mail";

$body = "Hello World!";

send_mail($to,$subject,$body);

19. Convert seconds to days, hours and minutes

[code]php code:

function secsToStr($secs) {
    if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.&#39; day&#39;;if($days<>1){$r.=&#39;s&#39;;}if($secs>0){$r.=&#39;, &#39;;}}
    if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.&#39; hour&#39;;if($hours<>1){$r.=&#39;s&#39;;}if($secs>0){$r.=&#39;, &#39;;}}
    if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.&#39; minute&#39;;if($minutes<>1){$r.=&#39;s&#39;;}if($secs>0){$r.=&#39;, &#39;;}}
    $r.=$secs.&#39; second&#39;;if($secs<>1){$r.=&#39;s&#39;;}
    return $r;
}

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Syntax:

$seconds = "56789";

$output = secsToStr($seconds);

echo $output;

20. Database connection

<?php
$DBNAME = &#39;koonk&#39;;
$HOST = &#39;localhost&#39;;
$DBUSER = &#39;root&#39;;
$DBPASS = &#39;koonk&#39;;
$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
if(!$CONNECT)
{
    echo &#39;MySQL Error: &#39;.mysql_error();
}
$SELECT = mysql_select_db($DBNAME);
if(!$SELECT)
{
    echo &#39;MySQL Error: &#39;.mysql_error();
}
?>

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21. Directory Listing

Use the following PHP code snippet to list all files and folders in a directory

[Code]php code:

function list_files($dir)
{
    if(is_dir($dir))
    {
        if($handle = opendir($dir))
        {
            while(($file = readdir($handle)) !== false)
            {
                if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
                {
                    echo &#39;<a target="_blank" href="&#39;.$dir.$file.&#39;">&#39;.$file.&#39;</a><br>&#39;."\n";
                }
            }
            closedir($handle);
        }
    }
}

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Syntax:

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

22. Detect user language

Use the following PHP code snippet to detect the language used by the user's browser

[Code]php code:

function get_client_language($availableLanguages, $default=&#39;en&#39;){
    if (isset($_SERVER[&#39;HTTP_ACCEPT_LANGUAGE&#39;])) {
        $langs=explode(&#39;,&#39;,$_SERVER[&#39;HTTP_ACCEPT_LANGUAGE&#39;]);
        foreach ($langs as $value){
            $choice=substr($value,0,2);
            if(in_array($choice, $availableLanguages)){
                return $choice;
            }
        }
    } 
    return $default;
}

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23. View CSV file

[Code]php code:

function readCSV($csvFile){
    $file_handle = fopen($csvFile, &#39;r&#39;);
    while (!feof($file_handle) ) {
        $line_of_text[] = fgetcsv($file_handle, 1024);
    }
    fclose($file_handle);
    return $line_of_text;
}

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Syntax:

$csvFile = "test.csv";

$csv = readCSV($csvFile);

$ a = csv[0][0]; // This will get value of Column 1 & Row 1

24. Create CSV file from PHP data

[code]php code:

function generateCsv($data, $delimiter = &#39;,&#39;, $enclosure = &#39;"&#39;) {
   $handle = fopen(&#39;php://temp&#39;, &#39;r+&#39;);
   foreach ($data as $line) {
           fputcsv($handle, $line, $delimiter, $enclosure);
   }
   rewind($handle);
   while (!feof($handle)) {
           $contents .= fread($handle, 8192);
   }
   fclose($handle);
   return $contents;
}

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Syntax:

$data[0] = "apple";

$data[1] = "oranges";

generateCsv($data, $delimiter = ',', $enclosure = '"'

PHP snippets can help you let users jump directly to the previously browsed page after logging in

[Code]php code:

$xml_string="<!--?xml version=&#39;1.0&#39;?-->
<moleculedb>
    <molecule name="Benzine">
        <symbol>ben</symbol>
        <code>A</code>
    </molecule>
    <molecule name="Water">
        <symbol>h2o</symbol>
        <code>K</code>
    </molecule>
</moleculedb>";
  
//load the xml string using <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Simple</a>xml function
$xml = simplexml_load_string($xml_string);
  
//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
   //attribute are accessted by
   echo $record[&#39;name&#39;], &#39;  &#39;;
   //node are accessted by -> operator
   echo $record->symbol, &#39;  &#39;;
   echo $record->code, &#39;<br>&#39;;
}

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Syntax:

echo "Currently you are on: ".current_url() ;

28. Get the latest Tweets from any Twitter account

[code]php code:

$json_string=&#39;{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} &#39;;
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

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Syntax:

$handle = "koonktech";

my_twitter ($handle);

29. Number of retweets

Use this PHP snippet to detect how many retweets your page URL has

[Code]php code:

function current_url()
{
$url = "http://" . $_SERVER[&#39;HTTP_HOST&#39;] . $_SERVER[&#39;REQUEST_URI&#39;];
$validURL = str_replace("&", "&", $url);
return validURL;
}

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Syntax:

$url = "http://blog.koonk.com";

$count = tweetCount($url);

return $count;

30. Calculate the difference between two dates

[code]php code:

<!--?php
$date1 = date( &#39;Y-m-d&#39; );
$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. <a href="http://www.php-z.com/" target="_blank" class="relatedlink">Base</a>d 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;
}
$date = "2014-12-04 19:37:22";
echo &#39;<pre class="brush:php;toolbar:false">&#39;;
print_r( _date_diff( strtotime($date), time() ) );
echo &#39;

'; ?>

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