PHP 程式碼片段

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1. 可閱讀隨機字串 此代碼將建立一個可閱讀的字串，使其更接近詞典中的單詞，實用且具有密碼驗證功能function readable_random_string($length = 6){    $conso=array("b","c","d","f","g","h","j","k","l",    "m","n","p","r","s","t","v","w","x","y","z");    $vocal=array("a","e","i","o","u");    $password="";    srand ((double)microtime()*1000000);    $max = $length/2;    for($i=1; $i<=$max; $i++)    {    $password.=$conso[rand(0,19)];    $password.=$vocal[rand(0,4)];    }    return $password;}2. 產生一個隨機字串如果不需要可閱讀的字串，使用此函數替代，即可建立一個隨機字串，作為使用者的隨機密碼等。function generate_rand($len){    $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";    srand((double)microtime()*1000000);    for($i=0; $i<$len; $i++) {        $rand.= $c[rand()%strlen($c)];    }    return $rand;}  function rand_password( $length = 8 ) {      // 密碼字元集，可任意添加你需要的字元      $chars = ‘[email protected]#$%^&*()-_ []{}<>~`+=,.;:/?|’;      $password = ”;      for ( $i = 0; $i < $length; $i++ )      {          // 這裡提供兩種字元擷取方式          // 第一種是使用 substr 截取$chars中的任意一位字元；          // 第二種是取字元數組 $chars 的任意元素          // $password .= substr($chars, mt_rand(0, strlen($chars) – 1), 1);          $password .= $chars[ mt_rand(0, strlen($chars) - 1) ];      }      return $password;  }    3. 編碼電子郵件地址可以將任何電子郵件地址編碼為 HTML 字元實體，以防止被垃圾郵件程式收集。    function encode_email($email=‘[email protected]‘, $linkText=‘Contact Us‘, $attrs =‘class="emailencoder"‘ )    {        // remplazar aroba y puntos        $email = str_replace(‘@‘, ‘@‘, $email);        $email = str_replace(‘.‘, ‘.‘, $email);        $email = str_split($email, 5);               $linkText = str_replace(‘@‘, ‘@‘, $linkText);        $linkText = str_replace(‘.‘, ‘.‘, $linkText);        $linkText = str_split($linkText, 5);               $part1 = ‘<a href="ma‘;        $part2 = ‘ilto:‘;        $part3 = ‘" ‘. $attrs .‘ >‘;        $part4 = ‘</a>‘;               $encoded = ‘<script type="text/javascript">‘;        $encoded .= "document.write(‘$part1‘);";        $encoded .= "document.write(‘$part2‘);";        foreach($email as $e)        {                $encoded .= "document.write(‘$e‘);";        }        $encoded .= "document.write(‘$part3‘);";        foreach($linkText as $l)        {                $encoded .= "document.write(‘$l‘);";        }        $encoded .= "document.write(‘$part4‘);";        $encoded .= ‘</script>‘;               return $encoded;    }        4. 驗證郵件地址    此代碼除了驗證電子郵件地址，也可以選擇檢查郵件域所屬 DNS 中的 MX 記錄，使郵件驗證功能更加強大    function is_valid_email($email, $test_mx = false)    {        if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email))            if($test_mx)            {                list($username, $domain) = split("@", $email);                return getmxrr($domain, $mxrecords);            }            else                return true;        else            return false;    }      5. 列出目錄內容    function list_files($dir)    {        if(is_dir($dir))        {            if($handle = opendir($dir))            {                while(($file = readdir($handle)) !== false)                {                    if($file != "." && $file != ".." && $file != "Thumbs.db")                    {                        echo ‘<a target="_blank" href="‘.$dir.$file.‘">‘.$file.‘</a><br>‘."\n";                    }                }                closedir($handle);            }        }    }        -----------------------------    function list_dir($path){        $dp = dir($path);        while( $fp = $dp->read() ){            if ( $fp==‘.‘ ){                }        }    }    -----------------------------          7. 解析 JSON 資料    $json_string=‘{"id":1,"name":"foo","email":"[email protected]","interest":["wordpress","php"]} ‘;    $obj=json_decode($json_string);    echo $obj->name;    //prints foo    echo $obj->interest[1];    //prints php    $ary = json_decode($json_string,true);    echo $ary[‘id‘];        10. 擷取用戶端真實 IP 位址    function getRealIpAddr()    {        if (!emptyempty($_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 $ip;    }         11. 強制性檔案下載   function force_download($file){    if ((isset($file))&&(file_exists($file))) {       header("Content-length: ".filesize($file));       header(‘Content-Type: application/octet-stream‘);       header(‘Content-Disposition: attachment; filename="‘ . $file . ‘"‘);       readfile("$file");    } else {       echo "No file selected";    }}12. 建立標籤雲function getCloud($data = array(), $minFontSize = 12, $maxFontSize = 30){    $minimumCount = min(array_values($data));    $maximumCount = max(array_values($data));    $spread = $maximumCount - $minimumCount;    $cloudHTML = ‘‘;    $cloudTags = array();    $spread == 0 && $spread = 1;    foreach($data as $tag => $count){        $size = $minFontSize + ($count - $minimumCount) * ($maxFontSize - $minFontSize) / $spread;        $cloudTags[] = ‘<a style="font-size: ‘ . floor($size) . ‘px‘         . ‘" href="#" title="\‘‘ . $tag . ‘\‘ returned a count of ‘ . $count . ‘">‘         . htmlspecialchars(stripslashes($tag)) . ‘</a>‘;    }    return join("\n", $cloudTags) . "\n";}/** * Sample usage    ** */$arr = Array(‘Actionscript‘ => 35, ‘Adobe‘ => 22, ‘Array‘ => 44, ‘Background‘ => 43,    ‘Blur‘ => 18, ‘Canvas‘ => 33, ‘Class‘ => 15, ‘Color Palette‘ => 11, ‘Crop‘ => 42,    ‘Delimiter‘ => 13, ‘Depth‘ => 34, ‘Design‘ => 8, ‘Encode‘ => 12, ‘Encryption‘ => 30,    ‘Extract‘ => 28, ‘Filters‘ => 42);echo getCloud($arr, 12, 36);13. 尋找兩個字串的相似性similar_text(‘abcde‘, ‘abcdef‘, $percent);echo $percent;16. 檔案 Zip 壓縮function create_zip($files = array(), $destination = ‘‘, $overwrite = false){    if(file_exists($destination) && !$overwrite){        return false;    }    $valid_files = array();    if(is_array($files)){        foreach($files as $file){            if(file_exists($file)){                $valid_files[] = $file;            }        }    }    if(count($valid_files)){        $zip = new ZipArchive();        if($zip -> open($destination, $overwrite ? ZIPARCHIVE :: OVERWRITE : ZIPARCHIVE :: CREATE) !== true){            return false;        }        foreach($valid_files as $file){            $zip -> addFile($file, $file);        }        $zip -> close();        return file_exists($destination);    }else{        return false;    }}/** * **** Example Usage ** */$files = array(‘question_20120828_211308.csv‘, ‘question_20120828_211326.csv‘);create_zip($files, ‘myzipfile.zip‘, true);17. 解壓縮 Zip 檔案function unzip_file($file, $destination){    $zip = new ZipArchive() ;    if ($zip->open($file) !== TRUE) {        die (‘Could not open archive‘);    }    $zip->extractTo($destination);        $zip->close();}20. 調整映像尺寸$imgsrc = "http://www.nowamagic.net/images/3.jpg";$width = 780;$height = 420;resizejpg($imgsrc, $imgdst, $width, $height);function resizejpg($imgsrc, $imgdst, $imgwidth, $imgheight){     // $imgsrc jpg格式映像路徑 $imgdst jpg格式映像儲存檔案名稱 $imgwidth要改變的寬度 $imgheight要改變的高度    // 取得圖片的寬度,高度值    $arr = getimagesize($imgsrc);    header("Content-type: image/jpg");    $imgWidth = $imgwidth;    $imgHeight = $imgheight;     // Create image and define colors    $imgsrc = imagecreatefromjpeg($imgsrc);    $image = imagecreatetruecolor($imgWidth, $imgHeight); //建立一個彩色的底圖    imagecopyresampled($image, $imgsrc, 0, 0, 0, 0, $imgWidth, $imgHeight, $arr[0], $arr[1]);    imagepng($image);    imagedestroy($image);}21. 數組轉 json 格式, 包含中文字元 替代json_encodefunction jsonEncode($var) {          switch (gettype($var)) {              case ‘boolean‘:                  return $var ? ‘true‘ : ‘false‘;             case ‘integer‘:              case ‘double‘:                  return $var;              case ‘resource‘:              case ‘string‘:                  return ‘"‘. str_replace(array("\r", "\n", "<", ">", "&"),                      array(‘\r‘, ‘\n‘, ‘\x3c‘, ‘\x3e‘, ‘\x26‘),                      addslashes($var)) .‘"‘;              case ‘array‘:                  if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {                      $output = array();                      foreach ($var as $v) {                          $output[] = jsonEncode($v);                      }                      return ‘[ ‘. implode(‘, ‘, $output) .‘ ]‘;                  }              case ‘object‘:                  $output = array();                  foreach ($var as $k => $v) {                      $output[] = jsonEncode(strval($k)) .‘: ‘. jsonEncode($v);                  }                  return ‘{ ‘. implode(‘, ‘, $output) .‘ }‘;              default:                  return ‘null‘;          }    }22. 刪除目錄及其下所有檔案//Delete folder functionfunction deleteDirectory($dir) {    if (!file_exists($dir)) return true;    if (!is_dir($dir) || is_link($dir)) return unlink($dir);    foreach (scandir($dir) as $item) {        if ($item == ‘.‘ || $item == ‘..‘) continue;        if (!deleteDirectory($dir . "/" . $item)) {            chmod($dir . "/" . $item, 0777);            if (!deleteDirectory($dir . "/" . $item)) return false;        };    }    return rmdir($dir);} 

　　

PHP 程式碼片段