Broken yaml parsing.

[vetaltor]

Exception #0 (Exception): Notice: Undefined variable: line in ../vendor/magento/zendframework1/library/Zend/Config/Yaml.php on line 292

zf1/library/Zend/Config/Yaml.php

Line 292 in 4df0182

foreach ($line as $n => $line) {

[vetaltor]

Also, foreach ($lines as $n => $line) is not equal to while (list($n, $line) = each($lines)) (from original file https://github.com/zendframework/zf1/blob/136735e776f520b081cd374012852cb88cef9a88/library/Zend/Config/Yaml.php#L292). Since it does reset(), and also in PHP7 foreach loop doesn't utilize array pointer.

[halfpastfouram]

Yaml parsing is very slow as well. It would be better to use any other Yaml parser than the ZF1 yaml parser.