1. PHP可閱讀隨機(jī)字符串

此代碼將創(chuàng)建一個人類可讀的字符串，更接近字典中的單詞，實用且密碼有效。

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

*@length-lengthofrandomstring(mustbeamultipleof2)

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

函數(shù)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',

2. PHP生成一個隨機(jī)字符串

　　如果不需要可閱讀的字符串，使用此函數(shù)替代，即可創(chuàng)建一個隨機(jī)字符串，作為用戶的隨機(jī)密碼等。

1. /*************?
2. *@l?-?length?of?random?string?
3. */?
4. function?generate_rand($l){?
5. ??$c=?"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";?
6. ??srand((double)microtime()*1000000);?
7. ??for($i=0;?$i<$l;?$i++)?{?
8. ??????$rand.=?$c[rand()%strlen($c)];?
9. ??}?
10. ??return?$rand;?
11. }?

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。

1. function?encode_email($email='info@domain.com',?$linkText='Contact?Us',?$attrs?='class="emailencoder"'?)?
2. {?
3. ????//?remplazar?aroba?y?puntos?
4. ????$email?=?str_replace('@',?'&#64;',?$email);?
5. ????$email?=?str_replace('.',?'&#46;',?$email);?
6. ????$email?=?str_split($email,?5);???
7. ?
8. ????$linkText?=?str_replace('@',?'&#64;',?$linkText);?
9. ????$linkText?=?str_replace('.',?'&#46;',?$linkText);?
10. ????$linkText?=?str_split($linkText,?5);???
11. ?
12. ????$part1?=?'<a?href="ma';?
13. ????$part2?=?'ilto&#58;';?
14. ????$part3?=?'"?'.?$attrs?.'?>';?
15. ????$part4?=?'</a>';???
16. ?
17. ????$encoded?=?'<script?type="text/javascript">';?
18. ????$encoded?.=?"document.write('$part1');";?
19. ????$encoded?.=?"document.write('$part2');";?
20. ????foreach($email?as?$e)?
21. ????{?
22. ????????????$encoded?.=?"document.write('$e');";?
23. ????}?
24. ????$encoded?.=?"document.write('$part3');";?
25. ????foreach($linkText?as?$l)?
26. ????{?
27. ????????????$encoded?.=?"document.write('$l');";?
28. ????}?
29. ????$encoded?.=?"document.write('$part4');";?
30. ????$encoded?.=?'</script>';???
31. ?
32. ????return?$encoded;?
33. }?

4. PHP驗證郵件地址

　　電子郵件驗證也許是中最常用的網(wǎng)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(qiáng)大。

1. function?is_valid_email($email,?$test_mx?=?false)?
2. {?
3. ????if(eregi("^([_a-z0-9-]+)(.[_a-z0-9-]+)*@([a-z0-9-]+)(.[a-z0-9-]+)*(.[a-z]{2,4})$",?$email))?
4. ????????if($test_mx)?
5. ????????{?
6. ????????????list($username,?$domain)?=?split("@",?$email);?
7. ????????????return?getmxrr($domain,?$mxrecords);?
8. ????????}?
9. ????????else?
10. ????????????return?true;?
11. ????else?
12. ????????return?false;?
13. }?

5. PHP列出目錄內(nèi)容

1. function?list_files($dir)?
2. {?
3. ????if(is_dir($dir))?
4. ????{?
5. ????????if($handle?=?opendir($dir))?
6. ????????{?
7. ????????????while(($file?=?readdir($handle))?!==?false)?
8. ????????????{?
9. ????????????????if($file?!=?"."?&&?$file?!=?".."?&&?$file?!=?"Thumbs.db")?
10. ????????????????{?
11. ????????????????????echo?'<a?target="_blank"?href="'.$dir.$file.'">'.$file.'</a><br>'."n";?
12. ????????????????}?
13. ????????????}?
14. ????????????closedir($handle);?
15. ????????}?
16. ????}?
17. }?

6. PHP銷毀目錄

　　刪除一個目錄，包括它的內(nèi)容。

1. /*****?
2. *@dir?-?Directory?to?destroy?
3. *@virtual[optional]-?whether?a?virtual?directory?
4. */?
5. function?destroyDir($dir,?$virtual?=?false)?
6. {?
7. ????$ds?=?DIRECTORY_SEPARATOR;?
8. ????$dir?=?$virtual???realpath($dir)?:?$dir;?
9. ????$dir?=?substr($dir,?-1)?==?$ds???substr($dir,?0,?-1)?:?$dir;?
10. ????if?(is_dir($dir)?&&?$handle?=?opendir($dir))?
11. ????{?
12. ????????while?($file?=?readdir($handle))?
13. ????????{?
14. ????????????if?($file?==?'.'?||?$file?==?'..')?
15. ????????????{?
16. ????????????????continue;?
17. ????????????}?
18. ????????????elseif?(is_dir($dir.$ds.$file))?
19. ????????????{?
20. ????????????????destroyDir($dir.$ds.$file);?
21. ????????????}?
22. ????????????else?
23. ????????????{?
24. ????????????????unlink($dir.$ds.$file);?
25. ????????????}?
26. ????????}?
27. ????????closedir($handle);?
28. ????????rmdir($dir);?
29. ????????return?true;?
30. ????}?
31. ????else?
32. ????{?
33. ????????return?false;?
34. ????}?
35. }?

7. PHP解析 JSON 數(shù)據(jù)

　　與大多數(shù)流行的 Web 服務(wù)如 twitter 通過開放 API 來提供數(shù)據(jù)一樣，它總是能夠知道如何解析 API 數(shù)據(jù)的各種傳送格式，包括 JSON，XML 等等。

1. $json_string='{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]}?';?
2. $obj=json_decode($json_string);?
3. echo?$obj->name;?//prints?foo?
4. echo?$obj->interest[1];?//prints?php?

8. PHP解析 XML 數(shù)據(jù)

1. //xml?string?
2. $xml_string="<?xml?version='1.0'?>?
3. <users>?
4. <user?id='398'>?
5. <name>Foo</name>?
6. <email>foo@bar.com</name>?
7. </user>?
8. <user?id='867'>?
9. <name>Foobar</name>?
10. <email>foobar@foo.com</name>?
11. </user>?
12. </users>";??
13. ?
14. //load?the?xml?string?using?simplexml?
15. $xml?=?simplexml_load_string($xml_string);??
16. ?
17. //loop?through?the?each?node?of?user?
18. foreach?($xml->user?as?$user)?
19. {?
20. //access?attribute?
21. echo?$user['id'],?'?';?
22. //subnodes?are?accessed?by?->?operator?
23. echo?$user->name,?'?';?
24. echo?$user->email,?'<br?/>';?
25. }?

9. PHP創(chuàng)建日志縮略名

　　創(chuàng)建用戶友好的日志縮略名。

1. function?create_slug($string){?
2. $slug=preg_replace('/[^A-Za-z0-9-]+/',?'-',?$string);?
3. return?$slug;?
4. }?

10. PHP獲取客戶端真實 IP 地址

　　該函數(shù)將獲取用戶的真實 IP 地址，即便他使用代理服務(wù)器。

1. function?getRealIpAddr()?
2. {?
3. ????if?(!emptyempty($_SERVER['HTTP_CLIENT_IP']))?
4. ????{?
5. ????????$ip=$_SERVER['HTTP_CLIENT_IP'];?
6. ????}?
7. ????elseif?(!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))?
8. ????//to?check?ip?is?pass?from?proxy?
9. ????{?
10. ????????$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];?
11. ????}?
12. ????else?
13. ????{?
14. ????????$ip=$_SERVER['REMOTE_ADDR'];?
15. ????}?
16. ????return?$ip;?
17. }?

11. PHP強(qiáng)制性文件下載

　　為用戶提供強(qiáng)制性的文件下載功能。

1. /********************?
2. *@file?-?path?to?file?
3. */?
4. function?force_download($file)?
5. {?
6. if?((isset($file))&&(file_exists($file)))?{?
7. header("Content-length:?".filesize($file));?
8. header('Content-Type:?application/octet-stream');?
9. header('Content-Disposition:?attachment;?filename="'?.?$file?.?'"');?
10. readfile("$file");?
11. }?else?{?
12. echo?"No?file?selected";?
13. }?
14. }?

12. PHP創(chuàng)建標(biāo)簽云

1. function?getCloud(?$data?=?array(),?$minFontSize?=?12,?$maxFontSize?=?30?)?
2. {?
3. $minimumCount?=?min(?array_values(?$data?)?);?
4. $maximumCount?=?max(?array_values(?$data?)?);?
5. $spread?=?$maximumCount?-?$minimumCount;?
6. $cloudHTML?=?'';?
7. $cloudTags?=?array();??
8. ?
9. $spread?==?0?&&?$spread?=?1;??
10. ?
11. foreach(?$data?as?$tag?=>?$count?)?
12. {?
13. $size?=?$minFontSize?+?(?$count?-?$minimumCount?)?
14. *?(?$maxFontSize?-?$minFontSize?)?/?$spread;?
15. $cloudTags[]?=?'<a?style="font-size:?'?.?floor(?$size?)?.?'px'?
16. .?'"?href="#"?title="''?.?$tag?.?
17. ''?returned?a?count?of?'?.?$count?.?'">'?
18. .?htmlspecialchars(?stripslashes(?$tag?)?)?.?'</a>';?
19. }??
20. ?
21. return?join(?"n",?$cloudTags?)?.?"n";?
22. }?
23. /**************************?
24. ****?Sample?usage?***/?
25. $arr?=?Array('Actionscript'?=>?35,?'Adobe'?=>?22,?'Array'?=>?44,?'Background'?=>?43,?
26. 'Blur'?=>?18,?'Canvas'?=>?33,?'Class'?=>?15,?'Color?Palette'?=>?11,?'Crop'?=>?42,?
27. 'Delimiter'?=>?13,?'Depth'?=>?34,?'Design'?=>?8,?'Encode'?=>?12,?'Encryption'?=>?30,?
28. 'Extract'?=>?28,?'Filters'?=>?42);?
29. echo?getCloud($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(shù)，但此函數(shù)非常有用，用于比較兩個字符串并返回相似程度的百分比。

1. similar_text($string1,?$string2,?$percent);?
2. //$percent?will?have?the?percentage?of?similarity?

14. PHP在應(yīng)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。由于 Gravatar 提供了易于使用的 API，將其納入應(yīng)用程序也變得十分方便。

1. /******************?
2. *@email?-?Email?address?to?show?gravatar?for?
3. *@size?-?size?of?gravatar?
4. *@default?-?URL?of?default?gravatar?to?use?
5. *@rating?-?rating?of?Gravatar(G,?PG,?R,?X)?
6. */?
7. function?show_gravatar($email,?$size,?$default,?$rating)?
8. {?
9. echo?'<img?src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).?
10. '&default='.$default.'&size='.$size.'&rating='.$rating.'"?width="'.$size.'px"?
11. height="'.$size.'px"?/>';?
12. }?

15. PHP在字符斷點(diǎn)處截斷文字

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

1. //?Original?PHP?code?by?Chirp?Internet:?www.chirp.com.au?
2. //?Please?acknowledge?use?of?this?code?by?including?this?header.?
3. function?myTruncate($string,?$limit,?$break=".",?$pad="...")?{?
4. //?return?with?no?change?if?string?is?shorter?than?$limit?
5. if(strlen($string)?<=?$limit)?
6. return?$string;??
7. ?
8. //?is?$break?present?between?$limit?and?the?end?of?the?string??
9. if(false?!==?($breakpoint?=?strpos($string,?$break,?$limit)))?{?
10. if($breakpoint?<?strlen($string)?-?1)?{?
11. $string?=?substr($string,?0,?$breakpoint)?.?$pad;?
12. }?
13. }?
14. return?$string;?
15. }?
16. /*****?Example?****/?
17. $short_string=myTruncate($long_string,?100,?'?');?

16. PHP文件 Zip 壓縮

1. /*?creates?a?compressed?zip?file?*/?
2. function?create_zip($files?=?array(),$destination?=?'',$overwrite?=?false)?{?
3. //if?the?zip?file?already?exists?and?overwrite?is?false,?return?false?
4. if(file_exists($destination)?&&?!$overwrite)?{?return?false;?}?
5. //vars?
6. $valid_files?=?array();?
7. //if?files?were?passed?in...?
8. if(is_array($files))?{?
9. //cycle?through?each?file?
10. foreach($files?as?$file)?{?
11. //make?sure?the?file?exists?
12. if(file_exists($file))?{?
13. $valid_files[]?=?$file;?
14. }?
15. }?
16. }?
17. //if?we?have?good?files...?
18. if(count($valid_files))?{?
19. //create?the?archive?
20. $zip?=?new?ZipArchive();?
21. if($zip->open($destination,$overwrite???ZIPARCHIVE::OVERWRITE?:?ZIPARCHIVE::CREATE)?!==?true)?{?
22. return?false;?
23. }?
24. //add?the?files?
25. foreach($valid_files?as?$file)?{?
26. $zip->addFile($file,$file);?
27. }?
28. //debug?
29. //echo?'The?zip?archive?contains?',$zip->numFiles,'?files?with?a?status?of?',$zip->status;??
30. ?
31. //close?the?zip?--?done!?
32. $zip->close();??
33. ?
34. //check?to?make?sure?the?file?exists?
35. return?file_exists($destination);?
36. }?
37. else?
38. {?
39. return?false;?
40. }?
41. }?
42. /*****?Example?Usage?***/?
43. $files=array('file1.jpg',?'file2.jpg',?'file3.gif');?
44. create_zip($files,?'myzipfile.zip',?true);?

17. PHP解壓縮 Zip 文件

1. /**********************?
2. *@file?-?path?to?zip?file?
3. *@destination?-?destination?directory?for?unzipped?files?
4. */?
5. function?unzip_file($file,?$destination){?
6. //?create?object?
7. $zip?=?new?ZipArchive()?;?
8. //?open?archive?
9. if?($zip->open($file)?!==?TRUE)?{?
10. die?(’Could?not?open?archive’);?
11. }?
12. //?extract?contents?to?destination?directory?
13. $zip->extractTo($destination);?
14. //?close?archive?
15. $zip->close();?
16. echo?'Archive?extracted?to?directory';?
17. }?

18. PHP為 URL 地址預(yù)設(shè) http 字符串

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

1. if?(!preg_match("/^(http|ftp):/",?$_POST['url']))?{?
2. ???$_POST['url']?=?'http://'.$_POST['url'];?
3. }?

19. PHP將網(wǎng)址字符串轉(zhuǎn)換成超級鏈接

　　該函數(shù)將 URL 和 E-mail 地址字符串轉(zhuǎn)換為可點(diǎn)擊的超級鏈接。

1. function?makeClickableLinks($text)?{?
2. $text?=?eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',?
3. '<a?href="1">1</a>',?$text);?
4. $text?=?eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',?
5. '1<a?href="http://2">2</a>',?$text);?
6. $text?=?eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',?
7. '<a?href="mailto:1">1</a>',?$text);??
8. ?
9. return?$text;?
10. }?

20. PHP調(diào)整圖像尺寸

　　創(chuàng)建圖像縮略圖需要許多時間，此代碼將有助于了解縮略圖的邏輯。

1. /**********************?
2. *@filename?-?path?to?the?image?
3. *@tmpname?-?temporary?path?to?thumbnail?
4. *@xmax?-?max?width?
5. *@ymax?-?max?height?
6. */?
7. function?resize_image($filename,?$tmpname,?$xmax,?$ymax)?
8. {?
9. ????$ext?=?explode(".",?$filename);?
10. ????$ext?=?$ext[count($ext)-1];???
11. ?
12. ????if($ext?==?"jpg"?||?$ext?==?"jpeg")?
13. ????????$im?=?imagecreatefromjpeg($tmpname);?
14. ????elseif($ext?==?"png")?
15. ????????$im?=?imagecreatefrompng($tmpname);?
16. ????elseif($ext?==?"gif")?
17. ????????$im?=?imagecreatefromgif($tmpname);???
18. ?
19. ????$x?=?imagesx($im);?
20. ????$y?=?imagesy($im);???
21. ?
22. ????if($x?<=?$xmax?&&?$y?<=?$ymax)?
23. ????????return?$im;???
24. ?
25. ????if($x?>=?$y)?{?
26. ????????$newx?=?$xmax;?
27. ????????$newy?=?$newx?*?$y?/?$x;?
28. ????}?
29. ????else?{?
30. ????????$newy?=?$ymax;?
31. ????????$newx?=?$x?/?$y?*?$newy;?
32. ????}???
33. ?
34. ????$im2?=?imagecreatetruecolor($newx,?$newy);?
35. ????imagecopyresized($im2,?$im,?0,?0,?0,?0,?floor($newx),?floor($newy),?$x,?$y);?
36. ????return?$im2;?
37. }?

21. PHP檢測 ajax 請求

大多數(shù)的 JavaScript 框架如 jquery，Mootools 等，在發(fā)出 Ajax 請求時，都會發(fā)送額外的 HTTP_X_REQUESTED_WITH 頭部信息，頭當(dāng)他們一個ajax請求，因此你可以在服務(wù)器端偵測到 Ajax 請求。

1. if(!emptyempty($_SERVER['HTTP_X_REQUESTED_WITH'])?&&?strtolower($_SERVER['HTTP_X_REQUESTED_WITH'])?==?'xmlhttprequest'){?
2. ????//If?AJAX?Request?Then?
3. }else

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