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實用PHP代碼二十例

2013-11-15 12:24:25  來源: PHP編程 

   PHP可閱讀隨機字符串

  此代碼將創建一個可閱讀的字符串使其更接近詞典中的單詞實用且具有密碼驗證功能

  /**************
*@length length of random string (must be a multiple of )
**************/
function readable_random_string($length = ){
    $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()*);
    $max = $length/;
    for($i=; $i<=$max; $i++)
    {
    $password=$conso[rand()];
    $password=$vocal[rand()];
    }
    return $password;
}

   PHP生成一個隨機字符串

  如果不需要可閱讀的字符串使用此函數替代即可創建一個隨機字符串作為用戶的隨機密碼等

  /*************
*@l length of random string
*/
function generate_rand($l){
  $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  srand((double)microtime()*);
  for($i=; $i<$l; $i++) {
      $rand= $c[rand()%strlen($c)];
  }
  return $rand;
}

   PHP編碼電子郵件地址

  使用此代碼可以將任何電子郵件地址編碼為 html 字符實體以防止被垃圾郵件程序收集

  function encode_email($email=info@domaincom $linkText=Contact Us $attrs =class="emailencoder" )
{
    // remplazar aroba y puntos
    $email = str_replace(@ &#; $email);
    $email = str_replace( &#; $email);
    $email = str_split($email ); 

  $linkText = str_replace(@ &#; $linkText);
    $linkText = str_replace( &#; $linkText);
    $linkText = str_split($linkText ); 

  $part = <a href="ma;
    $part = ilto&#;;
    $part = " $attrs >;
    $part = </a>

  $encoded = <script type="text/javascript">;
    $encoded = "documentwrite($part);";
    $encoded = "documentwrite($part);";
    foreach($email as $e)
    {
            $encoded = "documentwrite($e);";
    }
    $encoded = "documentwrite($part);";
    foreach($linkText as $l)
    {
            $encoded = "documentwrite($l);";
    }
    $encoded = "documentwrite($part);";
    $encoded = </script>

  return $encoded;
}

   PHP驗證郵件地址

  電子郵件驗證也許是中最常用的網頁表單驗證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 $test_mx = false)
{
    if(eregi("^([_az]+)([_az]+)*@([az]+)([az]+)*([az]{})$" $email))
        if($test_mx)
        {
            list($username $domain) = split("@" $email);
            return getmxrr($domain $mxrecords);
        }
        else
            return true;
    else
        return false;
}

   PHP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 != "" && $file != "Thumbsdb")
                {
                    echo <a target="_blank" href="$dir$file">$file</a><br>"n";
                }
            }
            closedir($handle);
        }
    }
}

   PHP銷毀目錄

  刪除一個目錄包括它的內容

  /*****
*@dir Directory to destroy
*@virtual[optional] whether a virtual directory
*/
function destroyDir($dir $virtual = false)
{
    $ds = DIRECTORY_SEPARATOR;
    $dir = $virtual ? realpath($dir) : $dir;
    $dir = substr($dir ) == $ds ? substr($dir ) : $dir;
    if (is_dir($dir) && $handle = opendir($dir))
    {
        while ($file = readdir($handle))
        {
            if ($file == || $file == )
            {
                continue;
            }
            elseif (is_dir($dir$ds$file))
            {
                destroyDir($dir$ds$file);
            }
            else
            {
                unlink($dir$ds$file);
            }
        }
        closedir($handle);
        rmdir($dir);
        return true;
    }
    else
    {
        return false;
    }
}

   PHP解析 JSON 數據

  與大多數流行的 Web 服務如 twitter 通過開放 API 來提供數據一樣它總是能夠知道如何解析 API 數據的各種傳送格式包括 JSONXML 等等

  $json_string={"id":"name":"foo""email":"foo@foobarcom""interest":["wordpress""php"]} ;
$obj=json_decode($json_string);
echo $obj>name; //prints foo
echo $obj>interest[]; //prints php 

   PHP解析 XML 數據

  //xml string
$xml_string="<?xml version=?>
<users>
<user id=>
<name>Foo</name>
<email>foo@barcom</name>
</user>
<user id=>
<name>Foobar</name>
<email>foobar@foocom</name>
</user>
</users>";

  //load the xml string using simplexml
$xml = simplexml_load_string($xml_string);

  //loop through the each node of user
foreach ($xml>user as $user)
{
//access attribute
echo $user[id] ;
//subnodes are accessed by > operator
echo $user>name ;
echo $user>email <br />;
}

   PHP創建日志縮略名

  創建用戶友好的日志縮略名

  function create_slug($string){
$slug=preg_replace(/[^AZaz]+/ $string);
return $slug;
}

   PHP獲取客戶端真實 IP 地址

  該函數將獲取用戶的真實 IP 地址即便他使用代理服務器

  function getRealIpAddr()
{
    if (!emptyempty(實用PHP代碼二十一個實例 站長學院SERVER[REMOTE_ADDR];
    }
    return $ip;
}

   PHP強制性文件下載

  為用戶提供強制性的文件下載功能

  /********************
*@file path to file
*/
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header("Contentlength: "filesize($file));
header(ContentType: application/octetstream);
header(ContentDisposition: attachment; filename=" $file ");
readfile("$file");
} else {
echo "No file selected";
}
}

   PHP創建標簽雲

  function getCloud( $data = array() $minFontSize = $maxFontSize = )
{
$minimumCount = min( array_values( $data ) );
$maximumCount = max( array_values( $data ) );
$spread = $maximumCount $minimumCount;
$cloudHTML = ;
$cloudTags = array();

  $spread == && $spread = ;

  foreach( $data as $tag => $count )
{
$size = $minFontSize + ( $count $minimumCount )
* ( $maxFontSize $minFontSize ) / $spread;
$cloudTags[] = <a style="fontsize: floor( $size ) px
" href="#" title=" $tag
returned a count of $count ">
htmlspecialchars( stripslashes( $tag ) ) </a>;
}

  return join( "n" $cloudTags ) "n";
}
/**************************
**** Sample usage ***/
$arr = Array(Actionscript => Adobe => Array => Background =>
Blur => Canvas => Class => Color Palette => Crop =>
Delimiter => Depth => Design => Encode => Encryption =>
Extract => Filters => );
echo getCloud($arr );

   PHP尋找兩個字符串的相似性

  PHP 提供了一個極少使用的 similar_text 函數但此函數非常有用用於比較兩個字符串並返回相似程度的百分比

  similar_text($string $string $percent);
//$percent will have the percentage of similarity

   PHP在應用程序中使用 Gravatar 通用頭像

  隨著 WordPress 越來越普及Gravatar 也隨之流行由於 Gravatar 提供了易於使用的 API將其納入應用程序也變得十分方便

  /******************
*@email Email address to show gravatar for
*@size size of gravatar
*@default URL of default gravatar to use
*@rating rating of Gravatar(G PG R X)
*/
function show_gravatar($email $size $default $rating)
{
echo <img src="md($email)
&default=$default&size=$size&rating=$rating" width="$sizepx"
height="$sizepx" />;
}

   PHP在字符斷點處截斷文字

  所謂斷字 (word break)即一個單詞可在轉行時斷開的地方這一函數將在斷字處截斷字符串

  // Original PHP code by Chirp Internet: wwwchirpcomau
// Please acknowledge use of this code by including this header
function myTruncate($string $limit $break="" $pad="") {
// return with no change if string is shorter than $limit
if(strlen($string) <= $limit)
return $string;

  // is $break present between $limit and the end of the string?
if(false !== ($breakpoint = strpos($string $break $limit))) {
if($breakpoint < strlen($string) ) {
$string = substr($string $breakpoint) $pad;
}
}
return $string;
}
/***** Example ****/
$short_string=myTruncate($long_string );

   PHP文件 Zip 壓縮

  /* creates a compressed zip file */
function create_zip($files = array()$destination = $overwrite = false) {
//if the zip file already exists and overwrite is false return false
if(file_exists($destination) && !$overwrite) { return false; }
//vars
$valid_files = array();
//if files were passed in
if(is_array($files)) {
//cycle through each file
foreach($files as $file) {
//make sure the file exists
if(file_exists($file)) {
$valid_files[] = $file;
}
}
}
//if we have good files
if(count($valid_files)) {
//create the archive
$zip = new ZipArchive();
if($zip>open($destination$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
return false;
}
//add the files
foreach($valid_files as $file) {
$zip>addFile($file$file);
}
//debug
//echo The zip archive contains $zip>numFiles files with a status of $zip>status;

  //close the zip done!
$zip>close();

  //check to make sure the file exists
return file_exists($destination);
}
else
{
return false;
}
}
/***** Example Usage ***/
$files=array(filejpg filejpg filegif);
create_zip($files myzipfilezip true);

   PHP解壓縮 Zip 文件

  /**********************
*@file path to zip file
*@destination destination directory for unzipped files
*/
function unzip_file($file $destination){
// create object
$zip = new ZipArchive() ;
// open archive
if ($zip>open($file) !== TRUE) {
die (’Could not open archive’);
}
// extract contents to destination directory
$zip>extractTo($destination);
// close archive
$zip>close();
echo Archive extracted to directory;
}

   PHP為 URL 地址預設 http 字符串

  有時需要接受一些表單中的網址輸入但用戶很少添加 http:// 字段此代碼將為網址添加該字段

  if (!preg_match("/^(http|ftp):/" 實用PHP代碼二十一個實例 站長學院POST[url];
}

   PHP將網址字符串轉換成超級鏈接

  該函數將 URL 和 Email 地址字符串轉換為可點擊的超級鏈接

  function makeClickableLinks($text) { $text = eregi_replace((((f|ht){}tp://)[azAZ@:%_+~#?&//=]+) <a href=""></a> $text); $text = eregi_replace(([[:space:]()[{}])(www[azAZ@:%_+~#?&//=]+) <a href=">http://> $text); $text = eregi_replace(([_az]+@([az][az]+)+[az]{}) <a href="mailto:"></a> $text);  return $text;}

   PHP調整圖像尺寸

  創建圖像縮略圖需要許多時間此代碼將有助於了解縮略圖的邏輯

  /**********************
*@filename path to the image
*@tmpname temporary path to thumbnail
*@xmax max width
*@ymax max height
*/
function resize_image($filename $tmpname $xmax $ymax)
{
    $ext = explode("" $filename);
    $ext = $ext[count($ext)]; 

  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;
    } 

  $im = imagecreatetruecolor($newx $newy);
    imagecopyresized($im $im floor($newx) floor($newy) $x $y);
    return $im;
}


From:http://tw.wingwit.com/Article/program/PHP/201311/20882.html
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