PHP Startup: Invalid library (maybe not a PHP library) 'mysqlnd.so' in Unknown on line

[ganl]

Description

Added MySQL extension (source compilation):

cd php-8.1.22/
cd ext/mysqlnd/
cp config9.m4 config.m4
phpize
./configure  --enable-mysqlnd
make && make install

Resulted in this output:

php -m |grep mysql
PHP Warning:  PHP Startup: Invalid library (maybe not a PHP library) 'mysqlnd.so' in Unknown on line 0

mprotect(0x7f382958c000, 12288, PROT_READ) = 0
openat(AT_FDCWD, "/usr/xxx/php/lib/php/extensions/no-debug-non-zts-20210902/mysqlnd.so", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\371\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=285784, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 253824, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f3829a03000
mprotect(0x7f3829a12000, 163840, PROT_NONE) = 0
mmap(0x7f3829a12000, 114688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f3829a12000
mmap(0x7f3829a2e000, 45056, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2b000) = 0x7f3829a2e000
mmap(0x7f3829a3a000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x36000) = 0x7f3829a3a000
mmap(0x7f3829a40000, 3968, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f3829a40000
close(3)                                = 0
mprotect(0x7f3829a3a000, 20480, PROT_READ) = 0
munmap(0x7f3829a03000, 253824)          = 0
write(2, "PHP Warning:  PHP Startup: Inval"..., 103PHP Warning:  PHP Startup: Invalid library (maybe not a PHP library) 'mysqlnd.so' in Unknown on line 0
) = 103

config9.m4
……
dnl If some extension uses mysqlnd it will get compiled in PHP core

MySQL driver must be compiled into PHP core?

PHP Version

PHP 8.1.22

Operating System

CentOS7.9