[mysql] SQLSTATE[28000] [1045] Access denied for user 'root'@'localhost' (using password: YES) Symfony2

In your app/config/parameters.yml

# This file is auto-generated during the composer install
parameters:
    database_driver: pdo_mysql
    database_host: 127.0.0.1
    database_port: 3306
    database_name: symfony
    database_user: root
    database_password: "your_password"
    mailer_transport: smtp
    mailer_host: 127.0.0.1
    mailer_user: null
    mailer_password: null
    locale: en
    secret: ThisTokenIsNotSoSecretChangeIt

The value of database_password should be within double or single quotes as in: "your_password" or 'your_password'.

I have seen most of users experiencing this error because they are using password with leading zero or numeric values.

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