fix: enable error logging

Need to keep an eye on docker-library/php#358 to find out what is the reason that the `php_admin_flag[log_errors]` is necessary.

Dockerfile

@@ -9,7 +9,8 @@ COPY ./php.ini /usr/local/etc/php/php.ini
 RUN apt-get update && \
   apt-get install -y libzip-dev git && \
   rm -rf /var/lib/apt/lists/* && \
-  docker-php-ext-install zip pdo pdo_mysql
+  docker-php-ext-install zip pdo pdo_mysql && \
+  echo "php_admin_flag[log_errors] = On">>/usr/local/etc/php-fpm.conf
 
 RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
   php -r "if (hash_file('SHA384', 'composer-setup.php') === '61069fe8c6436a4468d0371454cf38a812e451a14ab1691543f25a9627b97ff96d8753d92a00654c21e2212a5ae1ff36') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" && \

php.ini

@@ -38,28 +38,18 @@ memory_limit=256M
 ; Error handling and logging ;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-error_reporting=0
+error_reporting=E_ALL
 display_errors=0
-display_startup_errors=1
+display_startup_errors=0
 log_errors=1
 log_errors_max_len=2048
 ignore_repeated_errors=0
 ignore_repeated_source=0
 report_memleaks=1
-
-; This setting is on by default.
-;report_zend_debug=0
-
+report_zend_debug=0
 track_errors=0
-
-; Turn off normal error reporting and emit XML-RPC error XML
-; http://php.net/xmlrpc-errors
-;xmlrpc_errors=0
-
-; An XML-RPC faultCode
-;xmlrpc_error_number=0
-
 html_errors=0
+error_log = /var/log/php-errors.log
 
 ;;;;;;;;;;;;;;;;;
 ; Data Handling ;