暂存

vendor/illuminate/database/Eloquent/Factories/Sequence.php

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+<?php
+
+namespace Illuminate\Database\Eloquent\Factories;
+
+use Countable;
+
+class Sequence implements Countable
+{
+    /**
+     * The sequence of return values.
+     *
+     * @var array
+     */
+    protected $sequence;
+
+    /**
+     * The count of the sequence items.
+     *
+     * @var int
+     */
+    public $count;
+
+    /**
+     * The current index of the sequence iteration.
+     *
+     * @var int
+     */
+    public $index = 0;
+
+    /**
+     * Create a new sequence instance.
+     *
+     * @param  mixed  ...$sequence
+     */
+    public function __construct(...$sequence)
+    {
+        $this->sequence = $sequence;
+        $this->count = count($sequence);
+    }
+
+    /**
+     * Get the current count of the sequence items.
+     *
+     * @return int
+     */
+    public function count(): int
+    {
+        return $this->count;
+    }
+
+    /**
+     * Get the next value in the sequence.
+     *
+     * @param  array<string, mixed>  $attributes
+     * @param  \Illuminate\Database\Eloquent\Model|null  $parent
+     * @return mixed
+     */
+    public function __invoke($attributes = [], $parent = null)
+    {
+        return tap(value($this->sequence[$this->index % $this->count], $this, $attributes, $parent), function () {
+            $this->index = $this->index + 1;
+        });
+    }
+}