Zend Studio 13.5.1 IDE When switch dev Macbook, I found because file path changed, all new projects will be lost PHP Language Library, the PHP Language Library can be found by the follow method

{ Mac OS Show Hidden file }

<< MAC OS X EL CAPITAN 10.11.6 SHOW SYSTEM LEVEL HIDDEN FILES BY COMMAND LINE >>

{ Find and Config .buildpath file }

In Code "<buildpathentry kind="con" path="org.eclipse.php.core.LANGUAGE"/>" is the config for PHP Library, if don't have .buildpath in project root, then create it. if your .buildpath don't have this item, then add it.

<?xml version="1.0" encoding="UTF-8"?>
<buildpath>

	....

	<buildpathentry kind="con" path="org.eclipse.php.core.LANGUAGE"/>
	<buildpathentry kind="src" path=""/>
</buildpath>