PHP - Variable Types
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PHP Data Types
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PHP Data Types
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Laravel version 8.64.0, PHP version 8.1.0, strtolower(): Passing null to parameter #1 ($string) of type string is deprecated · Issue #886 · beyondcode/laravel-websockets · GitHub
php - Why does my constant integer type convert to string? - Stack Overflow
How to get the Type of Variable in PHP? - TutorialKart
Beginner guide of PHP Strings - DevOpsSchool.com
