php中的phpinfo()函数有什么用
php中的phpinfo()函数的作用:phpinfo()函数是php中的一个内置函数,它可以提供关于系统中安装的php版本和php配置的详细信息。该函数在执行成功时返回true,执行失败时返回false。
phpinfo()函数
phpinfo()函数会输出关于 PHP 配置的信息。
phpinfo()是PHP中的一个内置函数,可以提供关于系统中安装的PHP版本和PHP配置的详细信息。phpinfo()函数返回一个布尔值;也就是说,它在成功时返回true,在faliure时返回false 。
基本语法:
phpinfo ([ int $what = INFO_ALL ] )
参数:
$what是一个可省略的参数,但$what被省略,则会输出全部的配置信息。
它可以有以下值:
● INFO_GENERAL:信息概述,用于显示配置行、php.ini位置、构建日期、Web服务器、系统等。
● INFO_CREDITS:用于显示PHP Credits。
● INFO_CONFIGURATION: 信息配置,用于显示PHP指令的当前值,本地值和主值。
● INFO_MODULES:信息模块,用于显示已加载的模块及其各自的设置。
● INFO_ENVIRONMENT:信息环境,用于显示环境变量信息。
● INFO_VARIABLES:信息变量,它显示来自EGPCS(环境,GET,POST,Cookie,服务器)的所有预定义变量。
● INFO_LICENSE:信息许可,用于显示PHP许可证信息。
● INFO_ALL:全部信息,显示以上所有信息。
返回类型:phpinfo()函数返回一个布尔值。也就是说,它在成功时返回true,在faliure时返回false 。
示例:
<?php phpinfo(); ?>
输出:
会显示有关PHP版本,配置,环境详细信息等的完整信息。
注意:使用CLI模式时,phpinfo()输出纯文本而不是HTML。
更多相关知识,请访问 PHP中文网!!

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