[PHP]实用函数8
//建立dBase资料表
int dBase_create(string filename,array fields)
//打开dBase资料表
int dbase_open(string filename,int flags)
//关闭dBase资料表
boolean dbase_close(int dbase_identifier)
//清理dBase资料表
bool dbase_pack(int dbase_identifier)
//加入记录到dBase资料表
bool dbase_add_record(int dbase_identifier,array record)
//删除dBase资料表的记录
bool dbase_delete_record(int dbase_identifier,int record)
//取得dBase资料表的记录
array dbase_get_record(int dbase_identifier,int record)
//取得dBase资料表的字段数
int dbase_numfields(int dbase_identifier)
//取得dBase资料表的记录数
int_dbase_numrecords(int dbase_identifier)
//打开目录并返回一个 dir_handle
int opendir(string path)
//关闭由 dir_handle 标志的目录连接
void closedir(int dir_handle)
//更改当前工作目录
int chdir(string directory)
//获得当前工作目录
string getcwd(void)
//把 dir_handle 回绕到开头
vod rewinddir(int dir_handle)
//从 dir_handle 中逐个读取目录
string readdir(int dir_handle)
//获得 path 所在的文件系统的空闲磁盘空间,以字节计
double diskfreespace(string directory)
//改变文件的属主
bool chown(string filename,mixed user)
//改变文件的组属性
bool chgrp(string filename,mixed group)
//更改文件属性
bool chmdo(string filename,int mode)
//设置文件的修改时间
bool touch(string filename,int [time])
//获得文件访问权限(以八进制形式返回)
int fileperms(string filename)
//获得文件的 i-node(索引节点)信息
int filenode(string filename)
//获得文件大小
int filesize(string filename)
//获得文件的 UID 值
int fileowner(string filename)
//获得文件的 GID 值
int filegroup(string filename)
//获得文件类型,可能的返回类型有 fifo、char、dir、block、link、file 及 unknown 等
string filetype(string filename)
//如果文件符合 xxx 指定的属性,则返回 true。xxx 是 dir、executable、file、link、readable、writeable 等
bool is_xxx(string filename)

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PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

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