超級實用的php函數片段

1. 使用textmagic API發送消息
可能有的時候，你需要發送一些短信給你的客戶，那麼你絕對應該看看textMagic。它提供了非常簡單的API來實現這個功能。但是不是免費的。

// Include the TextMagic PHP lib  
require('textmagic-sms-api-php/TextMagicAPI.php');  
  
// Set the username and password information  
$username = 'myusername';  
$password = 'mypassword';  
  
// Create a new instance of TM  
$router = new TextMagicAPI(array(  
    'username' => $username,  
    'password' => $password  
));  
  
// Send a text message to '999-123-4567'  
$result = $router->send('Wake up!', array(9991234567), true);  
  
// result:  Result is: Array ( [messages] => Array ( [19896128] => 9991234567 ) [sent_text] => Wake up! [parts_count] => 1 )

2. 通過IP判斷來源
這是一個非常實用的代碼片段，可以幫助你通過IP來判斷訪客來源。下面的方法通過接收一個參數，然後返回IP所在地點。如果沒有找到，則返回UNKNOWN。

function detect_city($ip) {  
  
        $default = 'UNKNOWN';  
  
        if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')  
            $ip = '8.8.8.8';  
  
        $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('{<li>City : ([^<]*)</li>}i', $content, $regs) )  {  
            $city = $regs[1];  
        }  
        if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) )  {  
            $state = $regs[1];  
        }  
  
        if( $city!='' && $state!='' ){  
          $location = $city . ', ' . $state;  
          return $location;  
        }else{  
          return $default;  
        }  
}

3. 顯示任何網頁的源代碼
是不是想顯示帶有行號的任何網頁的源代碼？這裏有個簡單的代碼片段，你只需要修改第二行的url即可

<!--?php // display source code    
$lines = file('http://google.com/');    
foreach ($lines as $line_num =--> $line) {    
    // loop thru each line and prepend line numbers    
    echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";    
}   
?>

4. 判斷服務器是否是HTTPS連接
需要判斷代碼運行環境是否是HTTPS服務器？下面的代碼可以幫助你實現，非常簡單！

if ($_SERVER['HTTPS'] != "on") {    
    echo "This is not HTTPS";    
}else{    
    echo "This is HTTPS";    
}

5. 在文本中顯示Facebook 粉絲數
想看看你在facebook有多少粉絲麼？下面代碼可以幫助你實現。

function fb_fan_count($facebook_name){    
    // Example: https://graph.facebook.com/digimantra    
    $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));    
    echo $data->likes;    
}    

6. 判斷一張圖片的主色調
下面這個代碼非常實用，能幫助你判斷一張圖片中的主色調，你可以分析任何圖片。

$i = imagecreatefromjpeg("image.jpg");    
     
for ($x=0;$x<imagesx($i);$x++) {="" for="" ($y="0;$y<imagesy($i);$y++)" $rgb="imagecolorat($i,$x,$y);" $r="($rgb">> 16) & 0xFF;    
        $g   = ($rgb >>  & 0xFF;    
        $b   = $rgb & 0xFF;    
     
        $rTotal += $r;    
        $gTotal += $g;    
        $bTotal += $b;    
        $total++;    
    }    
}    
     
$rAverage = round($rTotal/$total);    
$gAverage = round($gTotal/$total);    
$bAverage = round($bTotal/$total);    </imagesx($i);$x++)>

7. 瞭解你的內存使用情況
爲了優化你的腳本，你需要了解服務器上的RAM使用情況。這個代碼片段將幫助你瞭解內存使用，並且打印初始、最終以及峯值使用情況。

echo "Initial: ".memory_get_usage()." bytes \n";    
/* prints   
Initial: 361400 bytes   
*/   
     
// let's use up some memory    
for ($i = 0; $i < 100000; $i++) {    
    $array []= md5($i);    
}    
     
// let's remove half of the array    
for ($i = 0; $i < 100000; $i++) {    
    unset($array[$i]);    
}    
     
echo "Final: ".memory_get_usage()." bytes \n";    
/* prints   
Final: 885912 bytes   
*/   
     
echo "Peak: ".memory_get_peak_usage()." bytes \n";    
/* prints   
Peak: 13687072 bytes   
*/

8. 使用gzcompress()壓縮數據
當使用很長的string時，可以通過gzcompress()方法，將strings壓縮。解壓縮使用gzuncompress()即可。代碼如下。

$string =    
"Lorem ipsum dolor sit amet, consectetur    
adipiscing elit. Nunc ut elit id mi ultricies    
adipiscing. Nulla facilisi. Praesent pulvinar,    
sapien vel feugiat vestibulum, nulla dui pretium orci,    
non ultricies elit lacus quis ante. Lorem ipsum dolor    
sit amet, consectetur adipiscing elit. Aliquam    
pretium ullamcorper urna quis iaculis. Etiam ac massa    
sed turpis tempor luctus. Curabitur sed nibh eu elit    
mollis congue. Praesent ipsum diam, consectetur vitae    
ornare a, aliquam a nunc. In id magna pellentesque    
tellus posuere adipiscing. Sed non mi metus, at lacinia    
augue. Sed magna nisi, ornare in mollis in, mollis    
sed nunc. Etiam at justo in leo congue mollis.    
Nullam in neque eget metus hendrerit scelerisque    
eu non enim. Ut malesuada lacus eu nulla bibendum    
id euismod urna sodales. ";    
     
$compressed = gzcompress($string);    
     
echo "Original size: ". strlen($string)."\n";    
/* prints   
Original size: 800   
*/   
     
echo "Compressed size: ". strlen($compressed)."\n";    
/* prints   
Compressed size: 418   
*/   
     
// getting it back    
$original = gzuncompress($compressed);

9. 使用PHP執行Whois查詢
如果你需要得到指定域名的whois信息，爲什麼不使用PHP呢？下面的代碼可以幫助大家。

function whois_query($domain) {    
     
    // fix the domain name:    
    $domain = strtolower(trim($domain));    
    $domain = preg_replace('/^http:\/\//i', '', $domain);    
    $domain = preg_replace('/^www\./i', '', $domain);    
    $domain = explode('/', $domain);    
    $domain = trim($domain[0]);    
     
    // split the TLD from domain name    
    $_domain = explode('.', $domain);    
    $lst = count($_domain)-1;    
    $ext = $_domain[$lst];    
     
    // You find resources and lists    
    // like these on wikipedia:    
    //    
    // http://de.wikipedia.org/wiki/Whois    
    //    
    $servers = array(    
        "biz" => "whois.neulevel.biz",    
        "com" => "whois.internic.net",    
        "us" => "whois.nic.us",    
        "coop" => "whois.nic.coop",    
        "info" => "whois.nic.info",    
        "name" => "whois.nic.name",    
        "net" => "whois.internic.net",    
        "gov" => "whois.nic.gov",    
        "edu" => "whois.internic.net",    
        "mil" => "rs.internic.net",    
        "int" => "whois.iana.org",    
        "ac" => "whois.nic.ac",    
        "ae" => "whois.uaenic.ae",    
        "at" => "whois.ripe.net",    
        "au" => "whois.aunic.net",    
        "be" => "whois.dns.be",    
        "bg" => "whois.ripe.net",    
        "br" => "whois.registro.br",    
        "bz" => "whois.belizenic.bz",    
        "ca" => "whois.cira.ca",    
        "cc" => "whois.nic.cc",    
        "ch" => "whois.nic.ch",    
        "cl" => "whois.nic.cl",    
        "cn" => "whois.cnnic.net.cn",    
        "cz" => "whois.nic.cz",    
        "de" => "whois.nic.de",    
        "fr" => "whois.nic.fr",    
        "hu" => "whois.nic.hu",    
        "ie" => "whois.domainregistry.ie",    
        "il" => "whois.isoc.org.il",    
        "in" => "whois.ncst.ernet.in",    
        "ir" => "whois.nic.ir",    
        "mc" => "whois.ripe.net",    
        "to" => "whois.tonic.to",    
        "tv" => "whois.tv",    
        "ru" => "whois.ripn.net",    
        "org" => "whois.pir.org",    
        "aero" => "whois.information.aero",    
        "nl" => "whois.domain-registry.nl"   
    );    
     
    if (!isset($servers[$ext])){    
        die('Error: No matching nic server found!');    
    }    
     
    $nic_server = $servers[$ext];    
     
    $output = '';    
     
    // connect to whois server:    
    if ($conn = fsockopen ($nic_server, 43)) {    
        fputs($conn, $domain."\r\n");    
        while(!feof($conn)) {    
            $output .= fgets($conn,128);    
        }    
        fclose($conn);    
    }    
    else { die('Error: Could not connect to ' . $nic_server . '!'); }    
     
    return $output;    
}

10. 不顯示PHP錯誤而發送電子郵件取代之
如果你不想在頁面中顯示PHP錯誤，也可以通過email來獲取錯誤信息。下面的代碼可以幫助你實現。

<!--?php    
     
// Our custom error handler    
function nettuts_error_handler($number, $message, $file, $line, $vars){    
    $email = "    
        <p-->An error ($number) occurred on line    
        <strong>$line</strong> and in the <strong>file: $file.</strong>    
        <p> $message </p>";    
     
    $email .= "<pre class="brush:java;">" . print_r($vars, 1) . "</pre>";    
     
    $headers = 'Content-type: text/html; charset=iso-8859-1' . "\r\n";    
     
    // Email the error to someone...    
    error_log($email, 1, '[email protected]', $headers);    
     
    // Make sure that you decide how to respond to errors (on the user's side)    
    // Either echo an error message, or kill the entire project. Up to you...    
    // The code below ensures that we only "die" if the error was more than    
    // just a NOTICE.    
    if ( ($number !== E_NOTICE) && ($number < 2048) ) {    
        die("There was an error. Please try again later.");    
    }    
}    
     
// We should use our custom function to handle errors.    
set_error_handler('nettuts_error_handler');    
     
// Trigger an error... (var doesn't exist)    
echo $somevarthatdoesnotexist;
?>