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How to fix “Headers already sent” error in PHP
...ically
Previous error messages or notices
Intentional:
print, echo and other functions producing output
Raw <html> sections prior <?php code.
Why does it happen?
To understand why headers must be sent before output it's necessary
to look at a typical HTTP
response. PHP scripts ...
Vim clear last search highlighting
...
This is not clear from this answer and comments : note that set nohlsearch will disable the highlighting for next searches as well. The behaviour of :noh is very different : the highlighting will be automatically reenabled when you perform a new search or eve...
Check to see if a string is serialized?
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In case the passed string is not
unserializeable, FALSE is returned and
E_NOTICE is issued.
So, you have to check if the return value is false or not (with === or !==, to be sure not to have any problem with 0 or null or anything that equals to false, I'd say).
Just beware the notice : y...
How to get next/previous record in MySQL?
Say I have records with IDs 3,4,7,9 and I want to be able to go from one to another by navigation via next/previous links. The problem is, that I don't know how to fetch record with nearest higher ID.
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Ignore Typescript Errors “property does not exist on value of type”
... You could also create an interface that extends HTMLElement and has the additional getBBox property. That way you still get code completion on the other properties.
– thetallweeks
Sep 24 '14 at 19:13
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Displaying a message in iOS which has the same functionality as Toast in Android
...to know if there is any method in iOS which behaves like Toast messages in Android. That is, I need to display a message which is dismissed automatically after few seconds. This is similar to the functionality of the Toast class in the Android environment.
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Cloning a MySQL database on the same MySql instance
...s a bit dodgy.
Integrated from various good other answers
Both mysqldump and mysql commands accept options for setting connection details (and much more), like:
mysqldump -u <user name> --password=<pwd> <original db> | mysql -u <user name> -p <new db>
Also, if the ...
“Items collection must be empty before using ItemsSource.”
...so the fix is to explicitly indicate the property to be set.
Fix the XAML and the exception goes away:
<ListView Name="ListViewImages"
SelectionMode="Single"
ItemsSource="{Binding}">
<ListView.View>
<local:ImageView />
</ListView.View>
&l...
Disabling Chrome cache for website development
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The Chrome DevTools can disable the cache.
Right-click and choose Inspect Element to open the DevTools. Or use one of the following keyboard shortcuts:
F12
Command+Option+i on Mac
Control+Shift+i on Windows or Linux
Click Network in the toolbar to open the network pane.
Check ...
Can't start Eclipse - Java was started but returned exit code=13
I am trying to get my first taste of Android development using Eclipse. I ran into this problem when trying to run Eclipse, having installed version 4.2 only minutes ago.
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