How to set Read only field in tca.php

  

How to set Read only field in tca.php
OR
How to disable textbox in typo3 backend

you can set readonly textbox in tca file for just set ‘readOnly’ to 1

'readOnly' =>1,

'count' => array (		
    'exclude' => 0,		
    'label' => 'LLL:EXT:EXTENSION_NAME/locallang_db.xml:count',		
    'config' => array (
        'type' => 'input',	
        'size' => '10',
        'readOnly' =>1,
        'default'=> 0,
    )
),