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HMAC-SHA1 in bash
...ution, but mainly to prove that the results are the same, we can also call PHP's hmac_sha1() from the command line:
[me@home]$ echo '<?= hash_hmac("sha1", "value", "key") ?>' | php
57443a4c052350a44638835d64fd66822f813319
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What column type/length should I use for storing a Bcrypt hashed password in a Database?
...40 bytes: 1 + 16 + 23
You can read more at the link above, or examine my PHP implementation, also on GitHub.
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How are feature_importances in RandomForestClassifier determined?
...ative ways to compute feature importance values in decision trees. A brief description of the above method can be found in "Elements of Statistical Learning" by Trevor Hastie, Robert Tibshirani, and Jerome Friedman.
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Mapping over values in a python dictionary
...e function the way you want (the name chosen in this answer is inspired by PHP's array_walk() function).
Note: Neither the try-except block nor the return statements are mandatory for the functionality, they are there to further mimic the behavior of the PHP's array_walk.
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Rails 4 - passing variable to partial
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<%=f.date_field :date, class: 'form-control' %>
<%=f.label :description, "Description"%>
<%=f.text_area :description, class: 'form-control' %>
<%= f.submit local_assigns[:button_label], class:"btn btn-primary"%>
<%end%>
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Preserve Line Breaks From TextArea When Writing To MySQL
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Two solutions for this:
PHP function nl2br():
e.g.,
echo nl2br("This\r\nis\n\ra\nstring\r");
// will output
This<br />
is<br />
a<br />
string<br />
Wrap the input in <pre></pre> tags.
See: W3C Wiki - HTML/El...
How to disassemble one single function using objdump?
...8 83 ec 20 sub $0x20,%rsp
To start with, I begin with the description of the objdump output. A section or function is separated by an empty line. Therefore changing the FS (Field Separator) to newline and the RS (Record Separator) to twice newline let you easily search for your reco...
How to unit test an object with database queries
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I've been using PHP's PDO as my lowest level access to the database, over which I extracted an interface. Then I built an application aware database layer on top of that. This is the layer that holds all the raw SQL queries and other infor...
What is the difference between `throw new Error` and `throw someObject`?
...lly, the name of the constructor function the error belongs to.
message: A description of the error, with this description varying depending on the browser.
Six possible values can be returned by the name property, which as mentioned correspond to the names of the error's constructors. They are:
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MySQL combine two columns into one column
...L() function in some implementations. In my situation, I have a column of descriptions which is NOT NULL, and a column of serial numbers which may be NULL This is how I combined them into one column:
SELECT CONCAT(description,IFNULL(' SN: ', serial_number),'')) FROM my_table;
My results suggest ...