欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

经验分享 总结PHP常用函数_PHP教程

程序员文章站 2022-06-12 12:21:36
...

PHP常用函数1.产生随机字符串函数

  1. function random($length) {
  2. $hash = @#@#;
  3. $chars = @#abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz@#;
  4. $max = strlen($chars) - 1;
  5. mt_srand((double)microtime() * 1000000);
  6. for($i = 0; $i $length; $i++) {
  7. $hash .= $chars[mt_rand(0, $max)];
  8. }
  9. return $hash;
  10. }

PHP常用函数2.截取一定长度的字符串

注:该函数对gb2312使用有效

  1. function wordscut($string, $length ,$sss=0) {
  2. if(strlen($string) > $length) {
  3. if($sss){
  4. $length=$length - 3;
  5. $addstr=@# ...@#;
  6. }
  7. for($i = 0; $i $length; $i++) {
  8. if(ord($string[$i]) > 127) {
  9. $wordscut .= $string[$i].$string[$i + 1];
  10. $i++;
  11. } else {
  12. $wordscut .= $string[$i];
  13. }
  14. }
  15. return $wordscut.$addstr;
  16. }
  17. return $string;
  18. }

PHP常用函数3.取得客户端ip地址

  1. function getip(){
  2. if (getenv("http_client_ip")
    && strcasecmp(getenv("http_client_ip"), "unknown"))
  3. $ip = getenv("http_client_ip");
  4. else if (getenv("http_x_forwarded_for")
    && strcasecmp(getenv("http_x_forwarded_for"), "unknown"))
  5. $ip = getenv("http_x_forwarded_for");
  6. else if (getenv("remote_addr")
    && strcasecmp(getenv("remote_addr"), "unknown"))
  7. $ip = getenv("remote_addr");
  8. else if (isset($_server[@#remote_addr@#])
    && $_server[@#remote_addr@#]
    && strcasecmp($_server[@#remote_addr@#], "unknown"))
  9. $ip = $_server[@#remote_addr@#];
  10. else
  11. $ip = "unknown";
  12. return($ip);
  13. }

PHP常用函数4.创建相应的文件夹

  1. function createdir($dir=@#@#)
  2. {
  3. if (!is_dir($dir))
  4. {
  5. $temp = explode(@#/@#,$dir);
  6. $cur_dir = @#@#;
  7. for($i=0;$icount($temp);$i++)
  8. {
  9. $cur_dir .= $temp[$i].@#/@#;
  10. if (!is_dir($cur_dir))
  11. {
  12. @mkdir($cur_dir,0777);
  13. }
  14. }



www.bkjia.comtruehttp://www.bkjia.com/PHPjc/446157.htmlTechArticlePHP常用函数1.产生随机字符串函数 functionrandom($length){ $ hash =@#@#; $ chars =@#abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz@#; $ max = strlen ($ch...