錯誤示下：

php -i | grep Load
Loaded Configuration File => (none)
libXML Loaded Version => 20901

解決辦法：

使用strace去追蹤一下：

#strace /usr/local/php/bin/php -i 2 > /tmp/1.log

grep 'php.ini' /tmp/1.log 顯示如下資訊：

open("/usr/local/php-7.0.23/bin/php-cli.ini", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/php/etc/php-cli.ini", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/php-7.0.23/bin/php.ini", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/php/etc/php.ini", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/local/php/etc/php.d", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
 

把php.ini複製到/usr/local/php-7.0.23/bin/下，然後配置檔案載入成功了。