经验分享 总结PHP常用函数_PHP教程
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2022-06-12 12:21:36
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PHP常用函数1.产生随机字符串函数
- function random($length) {
- $hash = @#@#;
- $chars = @#abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz@#;
- $max = strlen($chars) - 1;
- mt_srand((double)microtime() * 1000000);
- for($i = 0; $i $length; $i++) {
- $hash .= $chars[mt_rand(0, $max)];
- }
- return $hash;
- }
PHP常用函数2.截取一定长度的字符串
注:该函数对gb2312使用有效
- function wordscut($string, $length ,$sss=0) {
- if(strlen($string) > $length) {
- if($sss){
- $length=$length - 3;
- $addstr=@# ...@#;
- }
- for($i = 0; $i $length; $i++) {
- if(ord($string[$i]) > 127) {
- $wordscut .= $string[$i].$string[$i + 1];
- $i++;
- } else {
- $wordscut .= $string[$i];
- }
- }
- return $wordscut.$addstr;
- }
- return $string;
- }
PHP常用函数3.取得客户端ip地址
- function getip(){
- if (getenv("http_client_ip")
&& strcasecmp(getenv("http_client_ip"), "unknown"))- $ip = getenv("http_client_ip");
- else if (getenv("http_x_forwarded_for")
&& strcasecmp(getenv("http_x_forwarded_for"), "unknown"))- $ip = getenv("http_x_forwarded_for");
- else if (getenv("remote_addr")
&& strcasecmp(getenv("remote_addr"), "unknown"))- $ip = getenv("remote_addr");
- else if (isset($_server[@#remote_addr@#])
&& $_server[@#remote_addr@#]
&& strcasecmp($_server[@#remote_addr@#], "unknown"))- $ip = $_server[@#remote_addr@#];
- else
- $ip = "unknown";
- return($ip);
- }
PHP常用函数4.创建相应的文件夹
- function createdir($dir=@#@#)
- {
- if (!is_dir($dir))
- {
- $temp = explode(@#/@#,$dir);
- $cur_dir = @#@#;
- for($i=0;$icount($temp);$i++)
- {
- $cur_dir .= $temp[$i].@#/@#;
- if (!is_dir($cur_dir))
- {
- @mkdir($cur_dir,0777);
- }
- }