[11.x] Introduce method Rule::array()

src/Illuminate/Validation/Rule.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Support\Traits\Macroable;
+use Illuminate\Validation\Rules\ArrayRule;
 use Illuminate\Validation\Rules\Can;
 use Illuminate\Validation\Rules\Dimensions;
 use Illuminate\Validation\Rules\Enum;
@@ -59,6 +60,17 @@ public static function unless($condition, $rules, $defaultRules = [])
         return new ConditionalRules($condition, $defaultRules, $rules);
     }
 
+    /**
+     * Get an array rule builder instance.
+     *
+     * @param  array|null  $keys
+     * @return \Illuminate\Validation\ArrayRule
+     */
+    public static function array($keys = null)
+    {
+        return new ArrayRule(...func_get_args());
+    }
+
     /**
      * Create a new nested rule set.
      *
@@ -95,7 +107,7 @@ public static function exists($table, $column = 'NULL')
     }
 
     /**
-     * Get an in constraint builder instance.
+     * Get an in rule builder instance.
      *
      * @param  \Illuminate\Contracts\Support\Arrayable|\BackedEnum|\UnitEnum|array|string  $values
      * @return \Illuminate\Validation\Rules\In
@@ -110,7 +122,7 @@ public static function in($values)
     }
 
     /**
-     * Get a not_in constraint builder instance.
+     * Get a not_in rule builder instance.
      *
      * @param  \Illuminate\Contracts\Support\Arrayable|\BackedEnum|\UnitEnum|array|string  $values
      * @return \Illuminate\Validation\Rules\NotIn
@@ -125,7 +137,7 @@ public static function notIn($values)
     }
 
     /**
-     * Get a required_if constraint builder instance.
+     * Get a required_if rule builder instance.
      *
      * @param  callable|bool  $callback
      * @return \Illuminate\Validation\Rules\RequiredIf
@@ -136,7 +148,7 @@ public static function requiredIf($callback)
     }
 
     /**
-     * Get a exclude_if constraint builder instance.
+     * Get a exclude_if rule builder instance.
      *
      * @param  callable|bool  $callback
      * @return \Illuminate\Validation\Rules\ExcludeIf
@@ -147,7 +159,7 @@ public static function excludeIf($callback)
     }
 
     /**
-     * Get a prohibited_if constraint builder instance.
+     * Get a prohibited_if rule builder instance.
      *
      * @param  callable|bool  $callback
      * @return \Illuminate\Validation\Rules\ProhibitedIf
@@ -158,7 +170,7 @@ public static function prohibitedIf($callback)
     }
 
     /**
-     * Get an enum constraint builder instance.
+     * Get an enum rule builder instance.
      *
      * @param  class-string  $type
      * @return \Illuminate\Validation\Rules\Enum
@@ -169,7 +181,7 @@ public static function enum($type)
     }
 
     /**
-     * Get a file constraint builder instance.
+     * Get a file rule builder instance.
      *
      * @return \Illuminate\Validation\Rules\File
      */
@@ -179,7 +191,7 @@ public static function file()
     }
 
     /**
-     * Get an image file constraint builder instance.
+     * Get an image file rule builder instance.
      *
      * @return \Illuminate\Validation\Rules\ImageFile
      */
@@ -189,7 +201,7 @@ public static function imageFile()
     }
 
     /**
-     * Get a dimensions constraint builder instance.
+     * Get a dimensions rule builder instance.
      *
      * @param  array  $constraints
      * @return \Illuminate\Validation\Rules\Dimensions

src/Illuminate/Validation/Rules/ArrayRule.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Illuminate\Validation\Rules;
+
+use BackedEnum;
+use Illuminate\Contracts\Support\Arrayable;
+use Stringable;
+use UnitEnum;
+
+class ArrayRule implements Stringable
+{
+    /**
+     * The accepted keys.
+     *
+     * @var array
+     */
+    protected $keys;
+
+    /**
+     * Create a new array rule instance.
+     *
+     * @param  array|null  $keys
+     * @return void
+     */
+    public function __construct($keys = null)
+    {
+        if ($keys instanceof Arrayable) {
+            $keys = $keys->toArray();
+        }
+
+        $this->keys = is_array($keys) ? $keys : func_get_args();
+    }
+
+    /**
+     * Convert the rule to a validation string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        if (empty($this->keys)) {
+            return 'array';
+        }
+
+        $keys = array_map(
+            static fn ($key) => match (true) {
+                $key instanceof BackedEnum => $key->value,
+                $key instanceof UnitEnum => $key->name,
+                default => $key,
+            },
+            $this->keys,
+        );
+
+        return 'array:'.implode(',', $keys);
+    }
+}

tests/Validation/Enums.php

@@ -19,3 +19,17 @@ enum PureEnum
     case one;
     case two;
 }
+
+enum ArrayKeys
+{
+    case key_1;
+    case key_2;
+    case key_3;
+}
+
+enum ArrayKeysBacked: string
+{
+    case key_1 = 'key_1';
+    case key_2 = 'key_2';
+    case key_3 = 'key_3';
+}

tests/Validation/ValidationArrayRuleTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Illuminate\Tests\Validation;
+
+use Illuminate\Validation\Rule;
+use PHPUnit\Framework\TestCase;
+
+include_once 'Enums.php';
+
+class ValidationArrayRuleTest extends TestCase
+{
+    public function testItCorrectlyFormatsAStringVersionOfTheRule()
+    {
+        $rule = Rule::array();
+
+        $this->assertSame('array', (string) $rule);
+
+        $rule = Rule::array('key_1', 'key_2', 'key_3');
+
+        $this->assertSame('array:key_1,key_2,key_3', (string) $rule);
+
+        $rule = Rule::array(['key_1', 'key_2', 'key_3']);
+
+        $this->assertSame('array:key_1,key_2,key_3', (string) $rule);
+
+        $rule = Rule::array(collect(['key_1', 'key_2', 'key_3']));
+
+        $this->assertSame('array:key_1,key_2,key_3', (string) $rule);
+
+        $rule = Rule::array([ArrayKeys::key_1, ArrayKeys::key_2, ArrayKeys::key_3]);
+
+        $this->assertSame('array:key_1,key_2,key_3', (string) $rule);
+
+        $rule = Rule::array([ArrayKeysBacked::key_1, ArrayKeysBacked::key_2, ArrayKeysBacked::key_3]);
+
+        $this->assertSame('array:key_1,key_2,key_3', (string) $rule);
+    }
+}