When I execute this code I get NULL without any notice.
$a = false;
var_dump($a[5]);
Who can explain this?
Attempting to access an array key which has not been defined is the same as accessing any other undefined variable: an
E_NOTICE-levelerror message will be issued, and the result will beNULL.Array dereferencing a scalar value which is not a string silently yields
NULL, i.e. without issuing an error message.
Please refer more details on this: http://php.net/manual/en/language.types.array.php
You are accessing Boolean variable in array form is not possible.
Index 5 you are accessing that is not available in $a that is the reason you are getting null in var_dump
If you want to create array with Boolean value then it is possible
Check below code:
<?php
$a = array(true, false, true, true, false, false);
var_dump($a[5]);
?>
There are two PHP configuration variables which control displaying error messages.
The first one is display_errors. If it's set to On, error messages will appear in the output.
The other one is error_reporting. It defines the severity level of the errors to display.
Both settings can be changed during runtime using ini_set.