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<?php $stuff = ['a' => ['b' => 'c']]; $path = 'a.b'; $parts = explode('.', $path); $value = &$stuff; foreach ($parts as $part) { if (isset($value[$part])) { $value = &$value[$part]; } else { throw new \RuntimeException('fail at: ' . $part); } } var_dump($stuff); var_dump($value);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["a"]=> array(1) { ["b"]=> &string(1) "c" } } string(1) "c"

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