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经验分享总结PHP常用函数_PHP教程

时间:2021-07-01 10:21:17 帮助过:22人阅读

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;$i<count($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...

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