To add a field that can have a value of null in a CodeIgniter 4 migration, you can specify the field as nullable. The 'null' => true option in the field definition specifies that the field can have a null value.
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namespace App\Database\Migrations; use CodeIgniter\Database\Migration; class Add_nullable_field_migration extends Migration { public function up() { // Add the new field with nullable option $fields = [ 'new_field' => [ 'type' => 'VARCHAR', 'constraint' => 100, 'null' => true, // This specifies that the field can have a null value ], ]; $this->forge->addColumn('your_table_name', $fields); } public function down() { // Drop the field if you need to rollback the migration $this->forge->dropColumn('your_table_name', 'new_field'); } }Programming Language: PHP