To turn on errors at the script level, include at the top of your script:
ini_set('display_errors', 1);
error_reporting(~0);
Alternatively, if it is not a production site and simply a development / testing site, you can turn on error reporting in php.ini. Search it for these settings:
error_reporting = E_ALL
;error_reporting = E_ERROR
display_errors = On
;display_errors = Off
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