Declare types to function arguments, return values, and properties
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PHP Data Types
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PHP Data Types example and How to use in program
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PHP's Building Blocks: Data Types, Literals, Variables, and Constants | 4.1 Data Types | InformIT
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
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