Como habilitar ou desabilitar a exibição de errors e warnings no PHP

Por padrão o PHP é configurado para exibir qualquer tipo de erros ou alertas que ocorrem durante sua execução, essa é uma funcionalidade importante em ambientes de desenvolvimento, mas quando partimos para servidores voltados para produção isso pode se tornar um desperdício desnecessário de recursos além de um comprometimento na segurança da aplicação, já que serão exibidas para o público externo informações que só seriam interessante aos desenvolvedores do aplicativo ou administradores da rede.

Para desabilitar as massagens de errors e warnings do PHP procure no php.ini a linha:

display_errors = on

E modifique para:

display_errors = off

; Error handling and logging ;

; This directive informs PHP of which errors, warnings and notices you would like
; it to take action for. The recommended way of setting values for this
; directive is through the use of the error level constants and bitwise
; operators. The error level constants are below here for convenience as well as
; some common settings and their meanings.
; By default, PHP is set to take action on all errors, notices and warnings EXCEPT
; those related to E_NOTICE and E_STRICT, which together cover best practices and
; recommended coding standards in PHP. For performance reasons, this is the
; recommend error reporting setting. Your production server shouldn’t be wasting
; resources complaining about best practices and coding standards. That’s what
; development servers and development settings are for.
; Note: The php.ini-development file has this setting as E_ALL | E_STRICT. This
; means it pretty much reports everything which is exactly what you want during
; development and early testing.
; Error Level Constants:
; E_ALL – All errors and warnings (includes E_STRICT as of PHP 6.0.0)
; E_ERROR – fatal run-time errors
; E_RECOVERABLE_ERROR – almost fatal run-time errors
; E_WARNING – run-time warnings (non-fatal errors)
; E_PARSE – compile-time parse errors
; E_NOTICE – run-time notices (these are warnings which often result
; from a bug in your code, but it’s possible that it was
; intentional (e.g., using an uninitialized variable and
; relying on the fact it’s automatically initialized to an
; empty string)
; E_STRICT – run-time notices, enable to have PHP suggest changes
; to your code which will ensure the best interoperability
; and forward compatibility of your code
; E_CORE_ERROR – fatal errors that occur during PHP’s initial startup
; E_CORE_WARNING – warnings (non-fatal errors) that occur during PHP’s
; initial startup
; E_COMPILE_ERROR – fatal compile-time errors
; E_COMPILE_WARNING – compile-time warnings (non-fatal errors)
; E_USER_ERROR – user-generated error message
; E_USER_WARNING – user-generated warning message
; E_USER_NOTICE – user-generated notice message
; E_DEPRECATED – warn about code that will not work in future versions
; of PHP
; E_USER_DEPRECATED – user-generated deprecation warnings
; Common Values:
; E_ALL & ~E_NOTICE (Show all errors, except for notices and coding standards warnings.)
; E_ALL & ~E_NOTICE | E_STRICT (Show all errors, except for notices)
; E_ALL | E_STRICT (Show all errors, warnings and notices including coding standards.)
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
;error_reporting = E_ALL | E_STRICT

; This directive controls whether or not and where PHP will output errors,
; notices and warnings too. Error output is very useful during development, but
; it could be very dangerous in production environments. Depending on the code
; which is triggering the error, sensitive information could potentially leak
; out of your application such as database usernames and passwords or worse.
; It’s recommended that errors be logged on production servers rather than
; having the errors sent to STDOUT.
; Possible Values:
; Off = Do not display any errors
; stderr = Display errors to STDERR (affects only CGI/CLI binaries!)
; On or stdout = Display errors to STDOUT
; Default Value: On
; Development Value: On
; Production Value: Off
display_errors = on

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