如何将变量传递给函数？

文档中的示例:

DB::table('users')
->whereExists(function($query)
{
$query->select(DB::raw(1))
->from('orders')
->whereRaw('orders.user_id = users.id');
})
->get();

但是如果我需要这样的外部变量呢:

            ->where('city_id', '=', $this->city->id)
->where(function($query)
{
$query->where('name', 'LIKE', '%'.$searchQuery.'%')
->orWhere('address', 'LIKE', '%'.$searchQuery.'%')


})

现在我创建了一个新的属性并通过 $this->访问它，但是还有更方便的方法吗？

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最佳答案

You can pass the necessary variables from the parent scope into the closure with the use keyword.

For example: 

DB::table('users')->where(function ($query) use ($activated) {
$query->where('activated', '=', $activated);
})->get();

More on that here.

EDIT (2019 update):

PHP 7.4 (will be released at November 28, 2019) introduces a shorter variation of the anonymous functions called arrow functions which makes this a bit less verbose.

An example using PHP 7.4 which is functionally nearly equivalent (see the 3rd bullet point below):

DB::table('users')->where(fn($query) => $query->where('activated', '=', $activated))->get();

Differences compared to the regular syntax:

  • fn keyword instead of function.
  • No need to explicitly list all variables which should be captured from the parent scope - this is now done automatically by-value. See the lack of use keyword in the latter example.
  • Arrow functions always return a value. This also means that it's impossible to use void return type when declaring them.
  • The return keyword must be omitted.
  • Arrow functions must have a single expression which is the return statement. Multi-line functions aren't supported at the moment. You can still chain methods though.
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If you are using Laravel eloquent you may try this as well.

$result = self::select('*')
->with('user')
->where('subscriptionPlan', function($query) use($activated){
$query->where('activated', '=', $roleId);
})
->get();
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@kajetons' answer is fully functional.

You can also pass multiple variables by passing them like: use($var1, $var2)

DB::table('users')->where(function ($query) use ($activated,$var2) {
$query->where('activated', '=', $activated);
$query->where('var2', '>', $var2);
})->get();
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You can pass variables using this...

$status =1;
$info = JOBS::where(function($query) use ($status){
$query->where('status',$status);
})->get();
print_r($info);

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