composer install 报错（Install or enable PHPs redis extension）

Error message

<code> Problem <span>1</span>
    - The requested PHP extension ext-redis * <span>is</span> missing <span>from</span> your system. Install <span>or</span> enable PHP<span>'s redis extension.</span></code>

Solution
Install and enable the redis extension

<code>$ sudo apt<span>-get</span> install redis<span>-server</span>
$ sudo apt<span>-get</span> install php5<span>-redis</span></code>

Other similar errors can be solved like this

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The above introduces the composer install error (Install or enable PHPs redis extension), including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.