Description:
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After opening a symlink, PHP will always use the original link location, even if the link is externally modified during script execution.

Test script:
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<?php
file_put_contents("linkOrig", "old data");
file_put_contents("linkNew", "new data");

//create the link
symlink("linkOrig", "link");
//`ln -s linkOrig link`;//this also works

file_get_contents("link");//open it and read it (caches the link data)

//simulate another program altering it
`ln -fs linkNew link`;

echo file_get_contents("link");


Expected result:
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new data

Actual result:
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old data