[banghamid]

Description
ArrayHelper::dotKeyExists() previously had two bugs when traversing dot-notation paths:

1. Early loop termination on segment '0': while ($currentIndex = array_shift($indexes)) evaluated '0' as falsy and immediately exited the loop, returning true without checking whether '0' or any subsequent segments existed in the array (e.g., ArrayHelper::dotKeyExists('0', []) and ArrayHelper::dotKeyExists('contacts.friends.0.nonexistent', $array) both returned true).
2. Unhandled TypeError on non-array intermediate values: When an intermediate segment resolved to a scalar or null (e.g., contacts.friends.1.age.sub where age is an integer), calling array_key_exists() on the next segment threw a TypeError.

This PR:

• Uses while (($currentIndex = array_shift($indexes)) !== null) so '0' segments are properly traversed.
• Verifies is_array() on $currentArray and wildcard $item elements before calling array_key_exists().
• Adds regression assertions in ArrayHelperDotKeyExistsTest.
• Adds a changelog entry in \docs/changelogs/v4.7.7.md.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[gr8man]

Thank you @banghamid for this PR! The fix is clean, accurate, and addresses two very real issues: premature loop termination due to '0' being falsy in PHP, and fatal TypeErrors when encountering scalar intermediate segments.

The logic and test coverage look very solid. I have just a couple of minor suggestions before this is ready to merge:

1. Test coverage for ! is_array($item)

In ArrayHelper.php:158, you added:

if (! is_array($item) || ! array_key_exists($currentIndex, $item)) {

Currently, all items traversed in the wildcard test datasets are arrays, so the ! is_array($item) branch is not covered. It would be great to add a regression assertion for non-array items within a wildcard search, for example in testDotKeyExistsWithWildCard:

$this->assertFalse(ArrayHelper::dotKeyExists('*.name', [['name' => 'Fred'], 'not-an-array']));

2. Positive assertions for '0' and null values (Optional)

The new assertions for '0' are currently all negative (assertFalse). Adding a couple of positive assertions would ensure full regression coverage:

$this->assertTrue(ArrayHelper::dotKeyExists('0', ['0' => 'value']));
$this->assertTrue(ArrayHelper::dotKeyExists('0', ['0' => null]));

3. Changelog

Per CI4 contributing guidelines, please add a brief note under ## Bugs Fixed in docs/changelogs/v4.7.7.md

Other than these minor points, the fix looks great!

[banghamid]

Thanks for taking a look @gr8man!

Good catch on the wildcard non-array item branch not being covered yet. I pushed an update to address all three points:

• Added the wildcard test case with a non-array item ('*.name' against [['name' => 'Fred'], 'not-an-array']) in testDotKeyExistsWithWildCard().
• Added the positive assertions for '0' keys (including a null value) in testDotKeyExists().
• Added a changelog entry under ## Bugs Fixed in docs/changelogs/v4.7.7.md.

Let me know if anything else is needed!