Error Free Laravel Migrations

<?php use Illuminate\Support\Facades\Schema; use Illuminate\Database\Schema\Blueprint; use Illuminate\Database\Migrations\Migration; class [class_name] extends Migration { public function table() { return '[table_name]'; } public function columns() { return [ [ "type"=>"integer", "column"=>"[column_name]", "after"=>"[after_column_name] (optional)", ] ]; } /** * Run the migrations. * * @return void */ public function up() { $table = $this->table(); $list = $this->columns(); foreach ($list as $item) { if(!Schema::hasColumn($table, $item['column'])){ Schema::table($table, function (Blueprint $table) use ($item) { $type = $item['type']; $column = $item['column']; if(isset($item['after'])) { $table->$type($column)->nullable()->after($item['after']); } else { $table->$type($column)->nullable(); } }); } } } /** * Reverse the migrations. * * @return void */ public function down() { $table = $this->table(); $list = $this->columns(); foreach ($list as $item) { if(Schema::hasColumn($table, $item['column'])){ Schema::table($table, function (Blueprint $table) use ($item) { $column = $item['column']; $table->dropColumn($column); }); } } } }