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Check if PHP session has already started
I have a PHP file that is sometimes called from a page that has started a session and sometimes from a page that doesn't have session started. Therefore when I have session_start() on this script I sometimes get the error message for "session already started". For that I've put these lines:
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Difference between scaling horizontally and vertically for databases [closed]
...ses and scalability is one of them. What is the difference between horizontally and vertically scaling these databases?
10 ...
What is lexical scope?
...
I understand them through examples. :)
First, lexical scope (also called static scope), in C-like syntax:
void fun()
{
int x = 5;
void fun2()
{
printf("%d", x);
}
}
Every inner level can access its outer levels.
There is another way, called dynamic scope used by ...
JSON: why are forward slashes escaped?
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JSON doesn't require you to do that, it allows you to do that. It also allows you to use "\u0061" for "A", but it's not required. Allowing \/ helps when embedding JSON in a <script> tag, which doesn't allow </ inside strings, like Seb points out.
Some of ...
Multi-Line Comments in Ruby?
.....is kinda ugly and creates
a String instance, but I know one guy
with a Smalltalk background, who
does this."
puts "Hello world!"
##
# most
# people
# do
# this
__END__
But all forgot there is another option.
Only at the end of a file, of course.
This is how it looks (via screenshot) - othe...
(Built-in) way in JavaScript to check if a string is a valid number
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A very important note about parseInt is that it will allow you to specify a radix for converting the string to an int. This is a big gotcha as it tries to guess a radix for you if you don't supply it. So, for example: parseInt("17") results in 17 (decimal, 10), but parseInt("...
Spring Boot JPA - configuring auto reconnect
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The above suggestions did not work for me.
What really worked was the inclusion of the following lines in the application.properties
spring.datasource.testWhileIdle = true
spring.datasource.timeBetweenEvictionRunsMillis = 3600000
spring.datasource.validationQuery = SELECT 1...
HttpServletRequest - how to obtain the referring URL?
...
Actually it's:
request.getHeader("Referer"),
or even better, and to be 100% sure,
request.getHeader(HttpHeaders.REFERER),
where HttpHeaders is com.google.common.net.HttpHeaders
...
Pythonic way to check if a list is sorted or not
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Actually we are not giving the answer anijhaw is looking for. Here is the one liner:
all(l[i] <= l[i+1] for i in xrange(len(l)-1))
For Python 3:
all(l[i] <= l[i+1] for i in range(len(l)-1))
...
Blocks on Swift (animateWithDuration:animations:completion:)
... dat completion block syntax :(
– Chris Allinson
Sep 25 '16 at 0:19
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