在php添加mongo过程中出现的mongo.so: > undefined symbol: php_json_encode in Unknown on line 0. After installation mongo driver for php 的错误

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my system is centos 6.3. I got the problem solved. vim /etc/php.ini then add extension=json.so before extension=mongo.so at last restart the php-fpm and nginx(apache) service php-fpm restart service ngxin restart It's OK!