tap() 返回原始值，允許在不中斷鍊式調(diào)用的情況下執(zhí)行副作用操作；1. 用於保存模型並返回實例，如tap(new User([...]))->save()；2. 修改對象同時保持鍊式調(diào)用，如tap($user)->update(['active' => false])；3. 調(diào)試時記錄中間值，如tap(...)->toArray()；它始終返回原始值而非回調(diào)結(jié)果，適用於對象、數(shù)組或基本類型，是處理日誌、事件或保存操作的理想選擇。

The tap helper function in Laravel is a handy utility that allows you to "tap into" a value, perform some actions on it, and then pass it along—usually as part of a method chain. It's particularly useful when you want to manipulate or inspect an object without breaking the flow of your code.

What Does tap() Do?

tap($value, $callback) takes two arguments:

• $value : The value or object you want to work with.
• $callback : A closure (function) that receives the value as its parameter.

After the callback runs, tap() returns the original value —not the result of the callback. This makes it perfect for side effects like logging, setting properties, or saving to the database, while still allowing method chaining.

Common Use Cases

1. Saving a Model and Returning It

You often create a model, save it, and want to return it—all in one chain.

 use Illuminate\Support\Arr;
use function tap;

$user = tap(new User(['name' => 'Taylor', 'email' => 'taylor@example.com']))->save();

Now $user is the saved User instance. The save() method is called inside the tap, but the original $user object is returned.

Alternatively, using tap with a callback:

 $user = tap(User::create(['name' => 'Taylor', 'email' => 'taylor@example.com']), function ($user) {
    // Do something after creation, like logging or sending a welcome email
    \Log::info("User created: {$user->id}");
    // Maybe dispatch a job
    // SendWelcomeEmail::dispatch($user);
});

Here, the user is created, the callback runs, and the created $user is returned.

2. Modifying an Object Without Breaking the Chain

Say you're building a response or transforming data:

 return tap($user)->update([
    'active' => false
]);

This calls update() on the user (which might trigger a database save), but returns the $user object itself—not the boolean result of update() .

This is especially useful in fluent interfaces.

3. Debugging in the Middle of a Chain

You can use tap to inspect values without stopping the flow:

 return collect($users)
    ->where('active', 1)
    ->tap(function ($activeUsers) {
        \Log::debug('Active users:', $activeUsers->toArray());
    })
    ->map->displayName();

The collection is logged mid-processing, but the chain continues unaffected.

Key Points to Remember

• tap() returns the original value , not the callback's return value.
• The callback receives the value as its only argument.
• It works with any type: objects, arrays, primitives.
• It's great for side effects (logging, events, saving) in fluent chains.

tap() vs. other helpers

Bonus: tap() with Static Methods (Laravel 9 )

You can also use tap on classes with ::class syntax in some contexts, but more commonly it's used on instances.

 return tap($post, PostObserver::class . '::saving')->save();

This isn't standard—better to stick with closures unless using Laravel's built-in tap support in models.

In short, tap() is ideal when you want to interact with a value temporarily —like saving, logging, or modifying—while keeping the original value flowing through your code. It keeps your code clean and expressive.

Basically: do something, then pass the original thing along.

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