[10.x] Add ArrayAccess to Stringable (#46279)

* Add ArrayAccess to Stringable.

* Fix typos and mistakes.

* formatting

---------

Co-authored-by: Taylor Otwell <[email protected]>

src/Illuminate/Support/Stringable.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Support;
 
+use ArrayAccess;
 use Closure;
 use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Traits\Conditionable;
@@ -10,7 +11,7 @@
 use JsonSerializable;
 use Symfony\Component\VarDumper\VarDumper;
 
-class Stringable implements JsonSerializable
+class Stringable implements JsonSerializable, ArrayAccess
 {
     use Conditionable, Macroable, Tappable;
 
@@ -1216,6 +1217,50 @@ public function jsonSerialize(): string
         return $this->__toString();
     }
 
+    /**
+     * Determine if the given offset exists.
+     *
+     * @param  mixed  $offset
+     * @return bool
+     */
+    public function offsetExists(mixed $offset): bool
+    {
+        return isset($this->value[$offset]);
+    }
+
+    /**
+     * Get the value at the given offset.
+     *
+     * @param  mixed  $offset
+     * @return string
+     */
+    public function offsetGet(mixed $offset): string
+    {
+        return $this->value[$offset];
+    }
+
+    /**
+     * Set the value at the given offset.
+     *
+     * @param  mixed  $offset
+     * @return void
+     */
+    public function offsetSet(mixed $offset, mixed $value): void
+    {
+        $this->value[$offset] = $value;
+    }
+
+    /**
+     * Unset the value at the given offset.
+     *
+     * @param  mixed  $offset
+     * @return void
+     */
+    public function offsetUnset(mixed $offset): void
+    {
+        unset($this->value[$offset]);
+    }
+
     /**
      * Proxy dynamic properties onto methods.
      *

tests/Support/SupportStringableTest.php

@@ -1179,4 +1179,13 @@ public function testToDateThrowsException()
 
         $this->stringable('not a date')->toDate();
     }
+
+    public function testArrayAccess()
+    {
+        $str = $this->stringable('my string');
+        $this->assertSame('m', $str[0]);
+        $this->assertSame('t', $str[4]);
+        $this->assertTrue(isset($str[2]));
+        $this->assertFalse(isset($str[10]));
+    }
 }