The PHP version has been updated rapidly, but how do you feel that many features are not used?
Is the usage scenario small, or is it because the PHP development team has created these features for its own needs?
It is not unnecessary, it isYouNo.
5.3 Namespace, this should be commonly used.
5.4 Traits, used to know.
Finally, if you still use trigger_error, you really don’t need this.
The syntax icing of array.