phpinfo của ngôn ngữ lập trình PHP cho ta biết những gì?

Ngôn ngữ lập trình PHP có nhiều thư viện, mỗi thư viện lại có nhiều giá trị, tham số cấu hình.

Hàm phpinfo trong PHP liệt kê tất các các thư viện và các giá trị, tham số cấu hình của mỗi thư viện.

PHP Version 8.3.1
System	Linux interdata.1704019704 5.14.0-362.13.1.el9_3.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Dec 21 07:12:43 EST 2023 x86_64
Build Date	Dec 20 2023 12:44:38
Build System	Red Hat Enterprise Linux release 9.3 (Plow)
Build Provider	Remi's RPM repository <https://rpms.remirepo.net/> #StandWithUkraine
Compiler	gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2)
Architecture	x86_64
Server API	FPM/FastCGI
Virtual Directory Support	disabled
Configuration File (php.ini) Path	/etc
Loaded Configuration File	/etc/php.ini
Scan this dir for additional .ini files	/etc/php.d
Additional .ini files parsed	/etc/php.d/10-opcache.ini, /etc/php.d/20-bz2.ini, /etc/php.d/20-calendar.ini, 
/etc/php.d/20-ctype.ini, /etc/php.d/20-curl.ini, /etc/php.d/20-dom.ini, /etc/php.d/20-enchant.ini, /etc/php.d/20-exif.ini, 
/etc/php.d/20-fileinfo.ini, /etc/php.d/20-ftp.ini, /etc/php.d/20-gd.ini, /etc/php.d/20-gettext.ini, /etc/php.d/20-iconv.ini, 
/etc/php.d/20-mbstring.ini, /etc/php.d/20-mysqlnd.ini, /etc/php.d/20-pdo.ini, /etc/php.d/20-phar.ini, /etc/php.d/20-posix.ini,
/etc/php.d/20-shmop.ini, /etc/php.d/20-simplexml.ini, /etc/php.d/20-sodium.ini, /etc/php.d/20-sqlite3.ini, 
/etc/php.d/20-sysvmsg.ini, /etc/php.d/20-sysvsem.ini, /etc/php.d/20-sysvshm.ini, /etc/php.d/20-tokenizer.ini, 
/etc/php.d/20-xml.ini, /etc/php.d/20-xmlwriter.ini, /etc/php.d/20-xsl.ini, /etc/php.d/30-mysqli.ini, 
/etc/php.d/30-pdo_mysql.ini, /etc/php.d/30-pdo_sqlite.ini, /etc/php.d/30-xmlreader.ini, /etc/php.d/40-igbinary.ini, 
/etc/php.d/40-msgpack.ini, /etc/php.d/50-redis.ini
PHP API	20230831
PHP Extension	20230831
Zend Extension	420230831
Zend Extension Build	API420230831,NTS
PHP Extension Build	API20230831,NTS
Debug Build	no
Thread Safety	disabled
Zend Signal Handling	enabled
Zend Memory Manager	enabled
Zend Multibyte Support	provided by mbstring
Zend Max Execution Timers	disabled
IPv6 Support	enabled
DTrace Support	available, disabled
Registered PHP Streams	https, ftps, compress.zlib, php, file, glob, data, http, ftp, compress.bzip2, phar
Registered Stream Socket Transports	tcp, udp, unix, udg, ssl, tls, tlsv1.0, tlsv1.1, tlsv1.2, tlsv1.3
Registered Stream Filters	zlib.*, string.rot13, string.toupper, string.tolower, convert.*, consumed, dechunk, bzip2.*, convert.iconv.*
Zend logoThis program makes use of the Zend Scripting Language Engine:
Zend Engine v4.3.1, Copyright (c) Zend Technologies with Zend OPcache v8.3.1, Copyright (c), by Zend Technologies