Difference between revisions of "PHP-and-MySQL/C2/Common-Errors-Part-3/English"
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Latest revision as of 19:49, 1 December 2012
| 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. |
