MySQL / PHP数据库设置为utf8,表设置为utf8,列设置为utf8_general_ci无法存储u201d

I've been dealing with a bug where a user will copy and paste text from an email onto a form on our page, but the text is cut off at special characters such as u201D (”) when it's inserted into the database with mysql_query().

On my development machine (windows) I backed up the database, dropped it, recreated it with CHARACTER SET utf8 and loaded the backup. Now it works correctly on my dev machine.

I tried the same fix on the live server (linux) and while everything shows up as utf8, the text is still being cut off.

My dev machine is running:
MySQL version: 5.7.9
PHP version: 5.6.16

The server is running:
MySQL version: 5.5.35-1ubuntu1
PHP version: 5.4.30
(We are planning to update MySQL / PHP, but a lot of code will need to be fixed first).

Does anyone know what the problem could be? Thanks.