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vendor/illuminate/support/Traits/Tappable.php

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+<?php
+
+namespace Illuminate\Support\Traits;
+
+trait Tappable
+{
+    /**
+     * Call the given Closure with this instance then return the instance.
+     *
+     * @param  callable|null  $callback
+     * @return $this|\Illuminate\Support\HigherOrderTapProxy
+     */
+    public function tap($callback = null)
+    {
+        return tap($this, $callback);
+    }
+}