PHP study notes 8--Problems caused by half quotation marks

I reinstalled the system some time ago, and then I decided to use PHP again, so I rebuilt the apache+php+mysql environment. Since I had built it many times before, I found it very easy, and it was quickly completed. Then I wrote the following Commonly used test environment codes:

<span>1</span> <span>php
</span><span>2</span><span>3</span><span>phpinfo</span><span>();
</span><span>4</span><span>5</span> ?>

Then output normally. If you feel that the environment is fine, just leave it alone...

I have been using it recently, but running the previous project code (using the CI framework) always displays a blank page , not getting any correct output.

I’m embarrassed...

I re-wrote simple php statements and they all run normally. It seems that the environment is fine.

It wasn’t until I used the date() function that I discovered a clue.

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.

However, I have already configured it in the php.ini file date.timezone = Asia/Shanghai

Okay, the information configured in the php.ini file does not take effect

The first thing that comes to mind is that the server is not reading this php.ini configuration file, because I have encountered wamp before Without deleting it, and then reconfiguring the environment by yourself, there is more than one php.ini file in the system, and the historical configuration file is read.

Looking for system files, there is only one php.ini file, and after reinstalling the system, even if it existed in the past, it is gone now.

Check phpinfo() again;

What is read is indeed the php.ini I configured now

Then the problem may be that there is a problem with the php.ini file and it is not parsed correctly.

I tried to use php code to connect to the database and found that the relevant functions could not be found...

It seems that there is indeed a problem with php.ini.

Check the modified configuration carefully, there is no problem...

Check again, there is still no problem...

...

...

Then, when it was time for my daily walk, I decided not to do it anymore. If it doesn't work, I delete them all, re-establish the environment, turn off the computer, go downstairs for a walk, and then make a phone call to complain about today's "happy" life...

After returning from the walk, I am not willing to give in, but I still have to figure it out, otherwise I won't be able to sleep...

Then, I checked php.ini for the last time without giving up, and finally caught this bug

When configuring the directory where the extension is located, I missed half of the quotation marks, which caused problems in subsequent parsing, so Configuring the time zone and accessing the database failed to work correctly.

Add the upper half of the quotation marks, restart the apache service, OK, everything is running so beautifully again

Summary: There is no need to be careless...

The above introduces the problems caused by PHP study notes 8-half quotation marks, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.