<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePageContents extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('page_contents', function (Blueprint $table) {
            $table->timestamps();
            $table->increments('id');
            $table->longText('content');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('page_contents');
    }
}

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePageContents extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('page_contents', function (Blueprint $table) {
            $table->timestamps();
            $table->increments('id');
            $table->text('content');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('page_contents');
    }
}

--- 
+++ 
@@ -15,7 +15,7 @@
         Schema::create('page_contents', function (Blueprint $table) {
             $table->timestamps();
             $table->increments('id');
-            $table->text('content');
+            $table->longText('content');
         });
     }
 
Change content data type to longtext
