暂存

vendor/illuminate/validation/Rules/RequiredIf.php

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+<?php
+
+namespace Illuminate\Validation\Rules;
+
+use Closure;
+use InvalidArgumentException;
+use Stringable;
+
+class RequiredIf implements Stringable
+{
+    /**
+     * The condition that validates the attribute.
+     *
+     * @var (\Closure(): bool)|bool
+     */
+    public $condition;
+
+    /**
+     * Create a new required validation rule based on a condition.
+     *
+     * @param  (\Closure(): bool)|bool|null  $condition
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct($condition)
+    {
+        if (is_null($condition)) {
+            $condition = false;
+        }
+
+        if ($condition instanceof Closure || is_bool($condition)) {
+            $this->condition = $condition;
+        } else {
+            throw new InvalidArgumentException('The provided condition must be a callable or boolean.');
+        }
+    }
+
+    /**
+     * Convert the rule to a validation string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        if (is_callable($this->condition)) {
+            return call_user_func($this->condition) ? 'required' : '';
+        }
+
+        return $this->condition ? 'required' : '';
+    }
+}