(Screenshot) Why does brew install extensions for PHP under Mac? After successful installation, why can’t the. so file be found in the installation directory? ?

  linux, question

Why does brew install extensions for PHP under Mac? After successful installation, why can’t the. so file be found in the installation directory? ?
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The default installation directory for brew is:/usr/local/cellular/

If the php55-redis extension is installed, the. so file will be generated in,/usr/local/cellular/PHP 55-Redis/2.2.7.