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 程式師世界 >> 編程語言 >> 網頁編程 >> PHP編程 >> PHP綜合 >> PHP實用代碼二十例

PHP實用代碼二十例

編輯:PHP綜合

1. 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 2)

	**************/

	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. 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= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

	  srand((double)microtime()*1000000);

	  for($i=0; $i<$l; $i++) {

	      $rand.= $c[rand()%strlen($c)];

	  }

	  return $rand;

	}

3. 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='[email protected]', $linkText='Contact Us', $attrs ='class="emailencoder"' )

	{

	    // remplazar aroba y puntos

	    $email = str_replace('@', '&#64;', $email);

	    $email = str_replace('.', '&#46;', $email);

	    $email = str_split($email, 5); 

 

    $linkText = str_replace('@', '&#64;', $linkText);     $linkText = str_replace('.', '&#46;', $linkText);     $linkText = str_split($linkText, 5); 

    $part1 = '<a href="ma';     $part2 = 'ilto&#58;';     $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. 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("^([_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. 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 != "Thumbs.db")

	                {

	                    echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."n";

	                }

	            }

	            closedir($handle);

	        }

	    }

	}

6. 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, -1) == $ds ? substr($dir, 0, -1) : $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;

	    }

	}

7. 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 JSON,XML 等等。

	$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 

8. PHP解析 XML 數據

	//xml string

	$xml_string="<?xml version='1.0'?>

	<users>

	<user id='398'>

	<name>Foo</name>

	<email>[email protected]</name>

	</user>

	<user id='867'>

	<name>Foobar</name>

	<email>[email protected]</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 />'; }

9. 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('/[^A-Za-z0-9-]+/', '-', $string);

	return $slug;

	}

10. 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;

	}

11. 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("Content-length: ".filesize($file));

	header('Content-Type: application/octet-stream');

	header('Content-Disposition: attachment; filename="' . $file . '"');

	readfile("$file");

	} else {

	echo "No file selected";

	}

	}

 

12. PHP創建標簽雲

	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. 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($string1, $string2, $percent);

	//$percent will have the percentage of similarity

14. 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, $rating)
{
echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).
'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"
height="'.$size.'px" />';
}

15. 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: www.chirp.com.au
// 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) - 1) {
$string = substr($string, 0, $breakpoint) . $pad;
}
}
return $string;
}
/***** Example ****/
$short_string=myTruncate($long_string, 100, ' ');

16. 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 ***/
$files=array(/uplink/Activities/Uploadimgs/201501/20151239264115407693.jpg', /uplink/Activities/Uploadimgs/201501/20151239264217217454.jpg', /uplink/Activities/Uploadimgs/201501/20151239264214171243.gif');
create_zip($files, 'myzipfile.zip', true);

17. 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';
}

18. 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'];
}

19. PHP將網址字符串轉換成超級鏈接

該函數將 URL 和 E-mail 地址字符串轉換為可點擊的超級鏈接。

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

20. 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)-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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