php --ini
For the webserver-SAPIs use phpinfo()
Here's some sample output:
bash-3.2# php --ini
Configuration File (php.ini) Path: /usr/local/php5/lib
Loaded Configuration File: /usr/local/php5/lib/php.ini
Scan for additional .ini files in: /usr/local/php5/php.d
Additional .ini files parsed: /usr/local/php5/php.d/10-extension_dir.ini,
/usr/local/php5/php.d/20-extension-opcache.ini,
/usr/local/php5/php.d/40-openssl.ini,
/usr/local/php5/php.d/50-extension-apcu.ini,
/usr/local/php5/php.d/50-extension-curl.ini,
/usr/local/php5/php.d/50-extension-gmp.ini,
/usr/local/php5/php.d/50-extension-imap.ini,
/usr/local/php5/php.d/50-extension-intl.ini,
/usr/local/php5/php.d/50-extension-mcrypt.ini,
/usr/local/php5/php.d/50-extension-mssql.ini,
/usr/local/php5/php.d/50-extension-pdo_pgsql.ini,
/usr/local/php5/php.d/50-extension-pgsql.ini,
/usr/local/php5/php.d/50-extension-propro.ini,
/usr/local/php5/php.d/50-extension-raphf.ini,
/usr/local/php5/php.d/50-extension-readline.ini,
/usr/local/php5/php.d/50-extension-xdebug.ini,
/usr/local/php5/php.d/50-extension-xsl.ini,
/usr/local/php5/php.d/60-extension-pecl_http.ini,
/usr/local/php5/php.d/99-liip-developer.ini
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