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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...nt instruction sequences, compiler optimizations enabled by -O2 might benefit average processor, but decrease performance on your particular processor (and the same applies to -Os). If you try the same example on different processors, you will find that on some of them benefit from -O2 while other a...
Disable button in jQuery
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edited Sep 17 '14 at 13:37
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How do I remove all .pyc files from a project?
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edited Jul 17 '18 at 9:27
Mark Amery
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Select between two dates with Django
I am looking to make a query that selects between dates with Django.
4 Answers
4
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Dynamic variable names in Bash
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Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g...
How to properly add cross-site request forgery (CSRF) token using PHP
I am trying to add some security to the forms on my website. One of the forms uses AJAX and the other is a straightforward "contact us" form. I'm trying to add a CSRF token. The problem I'm having is that the token is only showing up in the HTML "value" some of the time. The rest of the time, the va...
How to Execute SQL Server Stored Procedure in SQL Developer?
...dure. I added the JTDS SQL Server JDBC jar file to SQL Developer and added it as a Third Party JDBC driver. I can successfully log in to the SQL Server database. I was given this syntax for running the procedure:
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getenv() vs. $_ENV in PHP
...ly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation explains:
For example on Windows $_SERVER['Path'] is like you see, with the first letter capitalized, not 'PATH' as...
How to use the pass statement?
...eached the section about the pass statement. The guide I'm using defines it as being a Null statement that is commonly used as a placeholder.
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How can I output leading zeros in Ruby?
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If the maximum number of digits in the counter is known (e.g., n = 3 for counters 1..876), you can do
str = "file_" + i.to_s.rjust(n, "0")
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