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system/DataCaster/Cast/BooleanCast.php

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\DataCaster\Cast;
+
+/**
+ * Class BooleanCast
+ *
+ * (PHP) [bool --> bool      ] --> (DB driver) --> (DB column) bool|int(0/1)
+ *       [     <-- string|int] <-- (DB driver) <-- (DB column) bool|int(0/1)
+ */
+class BooleanCast extends BaseCast
+{
+    public static function get(
+        mixed $value,
+        array $params = [],
+        ?object $helper = null
+    ): bool {
+        // For PostgreSQL
+        if ($value === 't') {
+            return true;
+        }
+        if ($value === 'f') {
+            return false;
+        }
+
+        return filter_var($value, FILTER_VALIDATE_BOOLEAN);
+    }
+}