一些很有用的 PHP 代码片段

2. $host="localhost";
3. $uname="database username";
4. $pass="database password";
5. $database = "database name";
6. $connection=mysql_connect($host,$uname,$pass)
7. or die("Database Connection Failed");
9. $result=mysql_select_db($database)
10. or die("database cannot be selected");
12. ?>

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1. function words_limit( $str, $num, $append_str='' ){
2. $words = preg_split( '/[\s]+/', $str, -1, PREG_SPLIT_OFFSET_CAPTURE );
3. if( isset($words[$num][1]) ){
4. $str = substr( $str, 0, $words[$num][1] ).$append_str;
5. }
6. unset( $words, $num );
7. return trim( $str );>
8. }
10. echo words_limit($yourString, 50,'...');
12. or
14. echo words_limit($yourString, 50);

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1. function video_image($url){
2. $image_url = parse_url($url);
3. if($image_url['host'] == 'www.youtube.com' ||
4. $image_url['host'] == 'youtube.com'){
5. $array = explode("&", $image_url['query']);
6. return "http://img.youtube.com/vi/".substr($array[0], 2)."/0.jpg";
7. }else if($image_url['host'] == 'www.youtu.be' ||
8. $image_url['host'] == 'youtu.be'){
9. $array = explode("/", $image_url['path']);
10. return "http://img.youtube.com/vi/".$array[1]."/0.jpg";
11. }else if($image_url['host'] == 'www.vimeo.com' ||
12. $image_url['host'] == 'vimeo.com'){
13. $hash = unserialize(file_get_contents("http://vimeo.com/api/v2/video/".
14. substr($image_url['path'], 1).".php"));
15. return $hash[0]["thumbnail_medium"];
16. }
17. }
19. 

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1. function age_from_dob($dob){
2. $dob = strtotime($dob);
3. $y = date('Y', $dob);
4. if (($m = (date('m') - date('m', $dob))) $y++;
5. } elseif ($m == 0 && date('d') - date('d', $dob) $y++;
6. }
7. return date('Y') - $y;
8. }
10. echo age_from_dob('2005/04/19'); date in yyyy/mm/dd format.

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1. //设置 Cookie
2. setcookie("name", 'value', time()+3600*60*30);
4. //显示 Cookie
5. if ($_COOKIE["name"]!=""){
6. $_SESSION['name'] = $_COOKIE["name"];
7. }

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1. //方法1
2. echo substr(md5(uniqid()), 0, 8);
4. //方法2
5. function rand_password($length){
6. $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
7. $chars .= '0123456789' ;
8. $chars .= '!@#%^&*()_,./?;:[]{}\|=+';
10. $str = '';
11. $max = strlen($chars) - 1;
13. for ($i=0; $i $str .= $chars[rand(0, $max)];
15. return $str;
16. }
18. echo rand_password(16);

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1. date_default_timezone_set("Asia/Calcutta");
3. function dt_differ($start, $end){
4. $start = date("G:i:s:m:d:Y", strtotime($start));
5. $date1=explode(":", $start);
7. $end = date("G:i:s:m:d:Y", strtotime($end));
8. $date2=explode(":", $end);
10. $starttime = mktime(date($date1[0]),date($date1[1]),date($date1[2]),
11. date($date1[3]),date($date1[4]),date($date1[5]));
12. $endtime = mktime(date($date2[0]),date($date2[1]),date($date2[2]),
13. date($date2[3]),date($date2[4]),date($date2[5]));
15. $seconds_dif = $starttime-$endtime;
17. return $seconds_dif;
18. }

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1. function seconds2days($mysec) {
2. $mysec = (int)$mysec;
3. if ( $mysec === 0 ) {
4. return '0 second';
5. }
7. $mins = 0;
8. $hours = 0;
9. $days = 0;
12. if ( $mysec >= 60 ) {
13. $mins = (int)($mysec / 60);
14. $mysec = $mysec % 60;
15. }
16. if ( $mins >= 60 ) {
17. $hours = (int)($mins / 60);
18. $mins = $mins % 60;
19. }
20. if ( $hours >= 24 ) {
21. $days = (int)($hours / 24);
22. $hours = $hours % 60;
23. }
25. $output = '';
27. if ($days){
28. $output .= $days." days ";
29. }
30. if ($hours) {
31. $output .= $hours." hours ";
32. }
33. if ( $mins ) {
34. $output .= $mins." minutes ";
35. }
36. if ( $mysec ) {
37. $output .= $mysec." seconds ";
38. }
39. $output = rtrim($output);
40. return $output;
41. }

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1. $zip = zip_open("moooredale.zip");
2. if ($zip) {
3. while ($zip_entry = zip_read($zip)) {
4. $fp = fopen(zip_entry_name($zip_entry), "w");
5. if (zip_entry_open($zip, $zip_entry, "r")) {
6. $buf = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
7. fwrite($fp,"$buf");
8. zip_entry_close($zip_entry);
9. fclose($fp);
10. }
11. }
12. zip_close($zip);
13. }
14. ?>

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