Difference between revisions of "PHP-and-MySQL/C2/Common-Errors-Part-3/English-timed"

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|This is '''php''' '''header''' and we are using "header" function going to a location.
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|This is the '''php''' '''header''' and we are using "header" function going to a location.
 
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|And our "goto" variable is "google dot com".
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|And our '''$goto''' variable is "google dot com".
 
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|If the "goto" exists which it currently does, we are going to redirect the page to a u-r-l "google dot com".  
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|If the '''$goto''' exists which it currently does, we are going to redirect the page to a u-r-l "google dot com".  
 
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|Right now, this will return an '''error'''.
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|Right now, this will return an '''error'''
 
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|And the error is - Oh! um... Okay that’s why. "o b start".
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|and the error is - Oh! um... Okay that’s why. "o b_ start()".
 
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|Sorry, so we will go to "php header" and we have got "Welcome!" - our '''html code'''.
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|Sorry, so we will go to the "php header" and we have got "Welcome!" - our '''html code'''.
 
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|Then a warning - "Cannot modify  header information – headers already sent by..." and all of this.
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|Then a '''Warning - "Cannot modify  header information – headers already sent by..." and all of this.
 
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|Okay; so our '''headers''' have already been sent. This is the line no. by the way.
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|Okay; so our '''headers''' have already been sent. This is the line number, by the way.
 
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|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.
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|1, 2, 3 so if it gives you an error like "phpheader dot php" colon 3 then the error has occurred on the line number 3.
 
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|But the point is that we want this "welcome" '''header''' here.
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|But the point is that we want this "Welcome" '''header''' here.
 
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|And you can’t actually put '''html''' before a '''header''' function, going to location and other features of this function.  
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|And you can’t actually put '''html''' before a '''header''' function, going to '''Location''' and other features of this function.  
 
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|So, as you saw a minute ago that is "ob underscore start".
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|So, as you saw a minute ago, that is "ob underscore start()".
 
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|So, I can come here to "phpheader" and it works even though I have still got my '''html code''' echoed here before my '''header'''.
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|So, if I come here to "phpheader" and it works even though I have still got my '''html code''' echoed here, before my '''header'''.
 
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|So, without this we get an '''error''' (pause) and with this our '''header''' works fine. Okay?   
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|So, without this we get an '''error''' (pause) and with this our '''header''' works fine, okay?   
 
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|Despite the initial rule of no html output before header up here.
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|Despite the initial rule of 'no html output before header', up here.
 
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|This is "include a file which doesn’t even exist" named as "idontexist dot php".  
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|This is '''include''' a file which doesn’t even exist named as "idontexist dot php".  
 
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|Okay! So - include "idontexist dot php" failed to open stream; no such file or '''directory''' in that name here.
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|Okay! So - '''include idontexist dot php''' failed to open stream: No such file or directory in that name here.
 
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|We have another warning here - '''Failed to open "idontexist dot php" for inclusion''' and all of this.  So, we get two errors.  
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|We have another warning here - '''Failed to open "idontexist dot php" for inclusion...''' and all of this.  So, we get two errors.  
 
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|This is quite messy when you have a '''page''' that has "include a header file".
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|This is quite messy when you have a '''page''' that has '''include''' a header file.
 
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|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.  
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|Then these don’t look too nice. I mean you have probably been in a website before and you have seen this is at the top.  
 
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|You need to be attractive.  So you can put a "@ (at)" symbol in front and '''refresh'''.
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|You need to be attractive.  So, you can put a "@ (at)" symbol in front of it. '''refresh'''.
 
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|But it doesn’t excuse the fact that the file doesn’t exist.
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|But, it doesn’t excuse the fact that the file doesn’t exist.
 
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Latest revision as of 16:58, 22 May 2015

Time Narration
00:00 Right now I am onto the last two common errors that I have included.
00:05 And we will start with the hard one.
00:09 This is the php header and we are using "header" function going to a location.
00:14 And here, I have got some html code.
00:18 This is a header tag, I am saying "Welcome!".
00:21 And our $goto variable is "google dot com".
00:26 If the $goto exists which it currently does, we are going to redirect the page to a u-r-l "google dot com".
00:35 Right now, this will return an error
00:37 and the error is - Oh! um... Okay that’s why. "o b_ start()".
00:50 Let's get rid of this. That wasn’t supposed to be there. That code is to fix the error!
00:56 Sorry, so we will go to the "php header" and we have got "Welcome!" - our html code.
01:03 Then a Warning - "Cannot modify header information – headers already sent by..." and all of this.
01:10 Okay; so our headers have already been sent. This is the line number, by the way.
01:16 1, 2, 3 so if it gives you an error like "phpheader dot php" colon 3 then the error has occurred on the line number 3.
01:26 So that's where the error is - on line 3, okay?
01:32 And this error has been generated by line 9 which if you go here, is our "header" function.
01:39 So, the reason that this is happening is we are already sending our html code.
01:47 If I get rid of this by commenting it and I were to refresh then we would be redirected to google.
01:54 But the point is that we want this "Welcome" header here.
01:59 And you can’t actually put html before a header function, going to Location and other features of this function.
02:10 You shouldn't do so.
02:15 So, as you saw a minute ago, that is "ob underscore start()".
02:20 What this does is, it fixes this problem for us.
02:25 So, if I come here to "phpheader" and it works even though I have still got my html code echoed here, before my header.
02:37 So, without this we get an error (pause) and with this our header works fine, okay?
02:47 Despite the initial rule of 'no html output before header', up here.
02:53 That should be pretty clear by now.
02:55 Now, the last one is extremely simple.
02:58 I don’t even need to explain it but anyway.
03:02 This is include a file which doesn’t even exist named as "idontexist dot php".
03:08 So, let's have a look. Um.. where is it? "missing dot php".
03:13 Oh no! It's not. "open dot php".
03:16 Okay! So - include idontexist dot php failed to open stream: No such file or directory in that name here.
03:25 Our file name and directory on line 3.
03:27 So, let's come to line 3.
03:30 And that is the only line of significant code in this file.
03:35 We have another warning here - Failed to open "idontexist dot php" for inclusion... and all of this. So, we get two errors.
03:43 This is quite messy when you have a page that has include a header file.
03:50 Then these don’t look too nice. I mean you have probably been in a website before and you have seen this is at the top.
03:57 You need to be attractive. So, you can put a "@ (at)" symbol in front of it. refresh.
04:02 That won't show the error anymore.
04:06 But, it doesn’t excuse the fact that the file doesn’t exist.
04:10 So the content of the file which doesn’t exist, won’t be included.
04:14 But yes, to be honest, looking at this, this is really pretty much self explanatory. I just thought I should explain this anyway.
04:23 So, we have got a small collection of errors that you might come across when you are programming in php.
04:30 If there are other errors that you are getting, then please message me and I will be happy to help.
04:39 Please subscribe for latest updates. Thanks for watching. This is Evan Varkey, dubbing for the Spoken Tutorial project.

Contributors and Content Editors

Minal, Pratik kamble, Sandhya.np14