How to Pass Variables into Laravel Advanced Where Clauses?

Passing Variables into Laravel Advanced Where Clauses

In situations where you need to pass external variables into a Laravel advanced where clause, such as when filtering results using user-defined search criteria, the default syntax provided in the documentation may not suffice.

Fortunately, there's a more convenient solution using the use keyword, which allows you to capture variables from the parent scope into the closure that defines the where clause. For instance:

DB::table('users')->where(function($query) use ($searchQuery) {
    $query->where('name', 'LIKE', '%'.$searchQuery.'%')
        ->orWhere('address', 'LIKE', '%'.$searchQuery.'%');
});

In this example, the $searchQuery variable is passed from the parent scope into the closure and can be used within the where clause. The use keyword ensures that the variable is captured by reference, allowing it to be accessed and modified within the closure.

Alternatively, with the introduction of PHP 7.4's arrow functions, you can achieve the same result with a more concise syntax:

DB::table('users')->where(fn($query) => $query->where('name', 'LIKE', '%'.$searchQuery.'%')
    ->orWhere('address', 'LIKE', '%'.$searchQuery.'%'));

Arrow functions capture variables from the parent scope automatically, eliminating the need to explicitly list them using use. However, it's important to note that arrow functions always return a value and require omitting the return keyword.

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