PHP FTP 函数使用教程
引进的PHP的FTP该功能提供的FTP客户端访问文件服务器通过文件传输协议（ FTP ） 。
该FTP函数是用来打开，登录名和密切的联系，以及上传，下载，重命名，删除和获取信息的文件从文件服务器。并不是所有的FTP功能将与每一个服务器或返回同样的结果。该FTP函数成为可与PHP 3 。
这些功能都是为了详细访问FTP服务器。如果你只希望阅读或写入文件在FTP服务器上，可以考虑使用包装的ftp://与文件的功能。
安装
PHP的Windows版本内置了支持的FTP延长。因此， FTP函数将自动工作。
然而，如果您运行的是Linux版本的PHP中，你将不得不与编译PHP -启用-的F TP（ P HP4中+ ）或- wi th-的F T P（P H P3中）得到的F T P职能工作。
PHP的FTP函数
PHP的：显示最早的PHP版本，支持的功能。
| Function | Description | PHP |
|---|---|---|
| ftp_alloc() | Allocates space for a file to be uploaded to the FTP server | 5 |
| ftp_cdup() | Changes the current directory to the parent directory on the FTP server | 3 |
| ftp_chdir() | Changes the current directory on the FTP server | 3 |
| ftp_chmod() | Sets permissions on a file via FTP | 5 |
| ftp_close() | Closes an FTP connection | 4 |
| ftp_connect() | Opens an FTP connection | 3 |
| ftp_delete() | Deletes a file on the FTP server | 3 |
| ftp_exec() | Executes a program/command on the FTP server | 4 |
| ftp_fget() | Downloads a file from the FTP server and saves it to an open file | 3 |
| ftp_fput() | Uploads from an open file and saves it to a file on the FTP server | 3 |
| ftp_get_option() | Returns runtime behaviors of the FTP connection | 4 |
| ftp_get() | Downloads a file from the FTP server | 3 |
| ftp_login() | Logs on to an FTP connection | 3 |
| ftp_mdtm() | Returns the last modified time of a specified file | 3 |
| ftp_mkdir() | Creates a new directory on the FTP server | 3 |
| ftp_nb_continue() | Continues retrieving/sending a file (non-blocking) | 4 |
| ftp_nb_fget() | Downloads a file from the FTP server and saves it to an open file (non-blocking) | 4 |
| ftp_nb_fput() | Uploads from an open file and saves it to a file on the FTP server (non-blocking) | 4 |
| ftp_nb_get() | Downloads a file from the FTP server (non-blocking) | 4 |
| ftp_nb_put() | Uploads a file to the FTP server (non-blocking) | 4 |
| ftp_nlist() | Lists the files in a specified directory on the FTP server | 3 |
| ftp_pasv() | Turns passive mode on or off | 3 |
| ftp_put() | Uploads a file to the FTP server | 3 |
| ftp_pwd() | Returns the current directory name | 3 |
| ftp_quit() | Alias of ftp_close() | 3 |
| ftp_raw() | Sends a raw command to the FTP server | 5 |
| ftp_rawlist() | Returns a detailed list of files in the specified directory | 3 |
| ftp_rename() | Renames a file or directory on the FTP server | 3 |
| ftp_rmdir() | Removes a directory on the FTP server | 3 |
| ftp_set_option() | Sets runtime options for the FTP connection | 4 |
| ftp_site() | Sends a SITE command to the server | 3 |
| ftp_size() | Returns the size of the specified file | 3 |
| ftp_ssl_connect() | Opens a secure SSL-FTP connection | 4 |
| ftp_systype() | Returns the system type identifier of the FTP server | 3 |
PHP FTP Constants
PHP: indicates the earliest version of PHP that supports the constant.
| Constant | Description | PHP |
|---|---|---|
| FTP_ASCII | 3 | |
| FTP_TEXT | 3 | |
| FTP_BINARY | 3 | |
| FTP_IMAGE | 3 | |
| FTP_TIMEOUT_SEC | 3 | |
| FTP_AUTOSEEK | 4 | |
| FTP_AUTORESUME | Determine resume position and start position for get and put requests automatically | 4 |
| FTP_FAILED | Asynchronous transfer has failed | 4 |
| FTP_FINISHED | Asynchronous transfer has finished | 4 |
| FTP_MOREDATA | Asynchronous transfer is still active | 4 |
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php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM实现方法：1、使用“sleep(延迟秒数)”语句，可延迟执行函数若干秒；2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句，可延迟执行函数若干秒和纳秒；3、使用“time_sleep_until(time()+7)”语句。
php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PMphp除以100保留两位小数的方法：1、利用“/”运算符进行除法运算，语法“数值 / 100”；2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值，并保留两位小数。
php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM判断方法：1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式；2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的，因此真实天数需要在此基础上加1。
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php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM在php中，可以使用substr()函数来读取字符串后几个字符，只需要将该函数的第二个参数设置为负值，第三个参数省略即可；语法为“substr(字符串,-n)”，表示读取从字符串结尾处向前数第n个字符开始，直到字符串结尾的全部字符。
php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM方法：1、用“str_replace(" ","其他字符",$str)”语句，可将nbsp符替换为其他字符；2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。
php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PMphp判断有没有小数点的方法：1、使用“strpos(数字字符串,'.')”语法，如果返回小数点在字符串中第一次出现的位置，则有小数点；2、使用“strrpos(数字字符串,'.')”语句，如果返回小数点在字符串中最后一次出现的位置，则有。
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