1. 通过 php.ini 修改配置：
[root@/usr/local/php/etc]# /usr/local/php/bin/php -ini|grep php.iniconfiguration file (php.ini) path => /usr/local/php-5.3.29/lib[root@/usr/local/php/etc]# vim /usr/local/php-5.3.29/lib/php.ini
2. 通过 ini_set 修改配置： ini_set只能针对有效选项进行修改，详情请见：
ini_set php.ini 配置选项列表 3. 通过 php-fpm.conf 修改配置： 通过 php_value/php_flag，php_admin_value/php_admin_flag 对php.ini配置进行修改； 该修改方法只会在php-fpm进程请求中生效； 二者的区别在于前者修改指令可以被ini_set覆盖，后者修改指令不能通过ini_set覆盖； php_flag用来专门设置布尔值，如on, off, 1, 0, true, false, yes, no，而php_value用来设置所有类型的值；
; additional php.ini defines, specific to this pool of workers. these settings; overwrite the values previously defined in the php.ini. the directives are the ; same as the php sapi:; php_value/php_flag - you can set classic ini defines which can ; be overwritten from php call 'ini_set'.-; php_admin_value/php_admin_flag - these directives won't be overwritten by; php call 'ini_set'; for php_*flag, valid values are on, off, 1, 0, true, false, yes or no. ; defining 'extension' will load the corresponding shared extension from; extension_dir. defining 'disable_functions' or 'disable_classes' will not ; overwrite previously defined php.ini values, but will append the new value; instead.; note: path ini options can be relative and will be expanded with the prefix; (pool, global or /usr/local/php-5.3.29); default value: nothing is defined by default except the values in php.ini and ; specified at startup with the -d argument;php_admin_value[sendmail_path] = /usr/sbin/sendmail -t -i -f www@my.domain.com;php_flag[display_errors] = off ;php_admin_value[error_log] = /var/log/fpm-php.www.log;php_admin_flag[log_errors] = on;php_admin_value[memory_limit] = 32m
4. 自 5.3.3 起，通过 web服务器 修改配置： 如下通过nginx.conf修改配置：
set $php_value pcre.backtrack_limit=424242;set $php_value $php_value \n pcre.recursion_limit=99999;fastcgi_param php_value $php_value;fastcgi_param php_admin_value open_basedir=/var/www/htdocs;
5. 更多阅读 php-fpm.conf配置