You can do it in three ways to display all errors using PHP & .htaccess.
Enable error reporting in php.ini
display_errors = on (use this in php.ini file)
.htaccess error report method:
php_flag display_errors 1
Another method is you can directly write below mentioned code in which page error you want.
ini_set(‘display_errors’, ‘1’);
ini_set(‘display_startup_errors’, ‘1’);
error_reporting(E_ALL);