KPHPStorm — IDE plugin
For easier development, a plugin for PhpStorm was developed. It makes IDE understand KPHP specifics.
This plugin in the JetBrains repository
Brief info
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extended types in PHPDoc: arbitrary nesting, ?nullable, tuples, shapes and other KPHP types

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extended type inferring with per-key access completion and stdlib enhancements

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@kphp- doc tags autocomplete and validation

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strict type checking in function calls, assignments, return statements, array access, etc

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… and much more!
Detailed info
KPHPStorm greatly improves coding accuracy, indicating if you have missed typing or if types are inconsistent.
You see these errors immediately, not on compilation fail.