Description:
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The <> operator matches different when passing code directly to CLI mode using the -r parameter vs. a file using the -f parameter.

Test script:
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php.exe -r "error_reporting(0); $a = array('parent' => array('existing' => '0')); var_dump($a['notExisting'] <> "0"); var_dump($a['notExisting'] <> $a['parent']['existing']);"

---
vs.
---

php.exe -f test.php
with test.php has the contents:
<?php error_reporting(0); $a = array('parent' => array('existing' => '0')); var_dump($a['notExisting'] <> "0"); var_dump($a['notExisting'] <> $a['parent']['existing']); ?>

Expected result:
----------------
bool(true)
bool(true)

---
vs.
---

bool(false)
bool(true)

Actual result:
--------------
bool(false)
bool(true)

---
vs.
---

bool(false)
bool(true)