这篇文章是小编为大家总结的一些php系统类函数，很实用，需要的朋友千万不要错过。
认为整理的还比较详细的，亲们，就快点收藏起来吧！
PHP系统类函数
assert函数：检查assertion声明是否错误
extension_loaded函数：检查PHP扩展是否加载
get_cfg_var函数：获取PHP配置选项的值
get_current_user函数：获取当前PHP脚本的所有者的名称
get_defined_constants函数：返回一个包含PHP预定义常量信息的数组
get_extension_funcs函数：返回一个包含指定模块中的所有函数名称的数组
get_include_path函数：返回当前配置的文件包含路径的信息
get_included_files函数：返回一个关于文件包含信息的数组
get_loaded_extensions函数：返回一个包含所有装载模块信息的数组
get_magic_quotes_gpc函数：获取magic_quotes_gpc的状态信息
get_magic_quotes_runtime函数：获取magic_quotes_ runtime的状态信息
get_required_files函数：返回一个关于文件包含信息的数组
getenv函数：获取PHP环境变量的值
PHP系统类函数
getlastmod函数：获取当前PHP页面文件的最后修改时间
getmygid函数：获取当前PHP脚本页面所有者的GID号码
getmyinode函数：获取当前PHP脚本页面的INODE号码
getmypid函数：获取PHP的PID
getmyuid函数：获取PHP脚本页面所有者的UID号码
getopt函数：从命令行参数列表获取设置
getrusage函数：获取当前的资源语法
ini_get_all函数：获取所有配置选项
ini_get函数：获取配置选项的值
memory_get_usage函数：返回PHP脚本占用的内存空间
php_ini_scanned_files函数：返回配置文件目录下的配置文件列表
php_logo_guid函数：获取LOGO图片的GUID
php_sapi_name函数：获取PHP和Web服务器之间的接口类型
php_uname函数：获取PHP脚本运行的操作系统信息
phpcredits函数：打印credits列表
phpinfo函数：输出PHP的信息
phpversion函数：获取PHP版本
zend_logo_guid函数：获取ZEND的LOGO图片的GUID
zend_version函数：获取ZEND引擎的版本
PHP配置类函数
assert_options函数：设置或者获取不同的声明标记
ini_alter函数：设置PHP配置选项的值
ini_restore函数：恢复配置选项的值
ini_set函数：设置PHP配置选项的值
putenv函数：设置环境变量
restore_include_path函数：恢复文件包含路径配置信息
set_include_path函数：设置文件包含路径配置选项
set_magic_quotes_runtime函数：设置magic_quotes运行时间
set_time_limit函数：设置最大执行时间
其他类函数
dl函数：加载PHP的扩展模块
main函数：只是一个挂名的main()函数
version_compare函数：比较PHP两个版本值
以上就是全部的php系统类函数，，希望对大家的学习有所帮助。
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