php - 不显示通知错误

i don't get notice when i try to echo a variable that not declare. Why ?

    error_reporting  =  E_ALL & ~E_NOTICE
    display_errors = On
    error_log = "F:\phperror.log"

    zend_extension_ts="F:\work\xampp168w7\php\ext\php_xdebug.dll"
    xdebug.remote_enable=true
    xdebug.remote_host=127.0.0.1
    xdebug.remote_port=9000
    xdebug.remote_handler=dbgp
    xdebug.profiler_enable=1
    xdebug.profiler_output_dir="F:\work\xampp168w7\tmp"

;   - Show all errors, except for notices and coding standards warnings
;
;error_reporting = E_ALL & ~E_NOTICE

~E_NOTICE is 'no notices' I believe. Try just error_reporting = E_ALL

Unsure if echoing an undefined variable would cause an E_NOTICE though.

Edit: apparently echoing an undefined variable does report an E_NOTICE :) (see comments)

Change your ini setting to:

 error_reporting  =  E_ALL

or, during runtime:

 ini_set( 'error_reporting', E_ALL );