PHP-and-MySQL/C2/Common-Errors-Part-3/English

Time	Narration
0:00	Right now I am onto the last two common errors that I have included.
0:04	And we will start with the hard one.
0:09	This is php header and we are using "header" function going to a location.
0:14	And here I have got some html code.
0:18	This is a header tag, I am saying "Welcome!".
0:21	And our "goto" variable is "google dot com".
0:25	If the "goto" exists, which it currently does, we are going to redirect the page to a u-r-l "google dot com".
0:35	Right now, this will return an error.
0:37	And the error is - Oh! um... Okay that’s why. "o b start".
0:48	Lets get rid of this. That wasn’t supposed to be there. That code is to fix the error!
0:57	Sorry, so we will go to "php header" and we have got "Welcome!" - our html code.
1:01	Then a warning - "Cannot modify header information – headers already sent by..." and all of this.
1:07	Okay so our headers have already been sent. This is the line no. by the way.
1:14	1, 2, 3 so if it gives you an error like "phpheader dot php" colon 3, then the error has occurred on the line no. 3.
1:27	So that's where the error is - on line 3, okay?
1:32	And this error has been generated by line 9, which if you go here, is our "header" function.
1:39	So the reason that this is happening is we are already sending our html code.
1:47	If I get rid of this by commenting it, and I were to refresh then we would be redirected to google.
1:54	But the point is that we want this welcome header here.
1:59	And you can’t actually put html before a header function, going to location and other features of this function.
2:10	You shouldn't do so.
2:15	So as you saw a minute ago that is "ob underscore start".
2:20	What this does is, it fixes this problem for us.
2:25	So I can come here to "phpheader" and it works, even though I have still got my html code echoed here before my header.
2:35	So without this we get an error (pause) and with this our header works fine, okay?
2:47	Despite the initial rule of no html output before header up here.
2:53	That should be pretty clear by now.
2:55	Now, the last one is extremely simple.
2:58	I don’t even need to explain it but anyway.
3:01	This is "include a file which doesn’t even exist" named as "idontexist dot php".
3:08	So lets have a look. Um.. where is it? "missing dot php".
3:12	Oh no! Its not. "open dot php".
3:14	Okay! So - include "idontexist dot php" failed to open stream; no such file or directory in that name here.
3:25	Our file name and directory on line 3.
3:29	So lets come to line 3.
3:30	And that is the only line of significant code in this file.
3:34	We have another warning here - Failed to open "idontexist dot php" for inclusion and all of this. So we get two errors.
3:43	This is quite messy when you have a page that has "include a header file".
3:52	Then these don’t look too nice. I mean you have probably been in a website before and you have seen this at the top.
3:55	You need to be attractive. So you can put a "@ (at)" symbol in front and refresh.
4:00	That won't show the error anymore.
4:03	But it doesn’t excuse the fact that the file doesn’t exist.
4:06	So the content of the file which doesn’t exist, won’t be included.
4:12	But yes, to be honest, looking at this, this is really pretty much self explanatory. I just thought I should explain this anyways.
4:23	So we have got a small collection of errors that you might come across when you are programming in php.
4:30	If there are other errors that you are getting, then please message me and I will be happy to help.
4:39	Please subscribe for latest updates. Thanks for watching. This is Evan Varkey dubbing for the Spoken Tutorial project.

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