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Online Base Converter

In my spare time I usually do programming and write algorithms, basically after a long working day when I want to relax I enjoy writing algorithms. For example today I was bored, so I wrote codes for base conversion; actually this is very similar to one of my Maths assignment question in university. It may not perfect but I made it within a few hours using PHP. I never used any third party codes because whatever you see in this website, it is for my educational purpose only. Please comment it here if you have any queries, the algorithms is available on request


Online Base Converter

base converter

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I solved GCHQ puzzle and this is how I did it

Today, I was reading the BBC news and I stumbled upon this GCHQ puzzle:
Take the digits 1,2,3 up to 9 in numerical order and put either a plus sign or a minus sign or neither between the digits to make a sum that adds up to 100. For example, one way of achieving this is:
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We have 9 numbers [1 to 9] and also we have three possible separators [+, - and nothing] which to fill the gap between numbers we have 8 combinations of separators, e.g. we have 1+2+3+4+5+6+7-89 which in this case we have six times plus, one minus and one time nothing. 
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Then, hook the possible combinations into numbers and check the total, easy enough. Now print the solution.
I have written this algorithm in PHP but ea…

Vim cheatsheet

Global

:help keyword – open help for keyword

: o file – open file

:saveas file – save file as

:close – close current pane

Cursor movement

h – move cursor left

j – move cursor down

k – move cursor up

l – move cursor right

H – move to top of screen

M – move to middle of screen

L – move to bottom of screen

w – jump forwards to the start of a word

W – jump forwards to the start of a word (words can contain punctuation)

e – jump forwards to the end of a word

E – jump forwards to the end of a word (words can contain punctuation)

b – jump backwards to the start of a word

B – jump backwards to the start of a word (words can contain punctuation)

0 – jump to the start of the line

^ – jump to the first non-blank character of the line

$ – jump to the end of the line

g_ – jump to the last non-blank character of the line

gg – go to the first line of the document

G – go to the last line of the document

5G – go to line 5

fx – jump to next occurrence of character x

tx – jump to before next occurrence of character x

} – jump to …

Why Prestashop needs improvement for large application?

I have worked with Prestashop 1.6 long enough to know inside/outside of the application and even I developed few modules myself, all is simple and great but in small scale. My application is big, I am talking about millions rows in database. Two databases weight almost 18G (see the picture).

One day at 2AM I received a notification that my website/application is down. I looked at the server the application seems OK but the databases gone crazy big, (see the picture) it has gone from 18G to over 90G less than 6 hours. 
Since there was almost none free space left on the server, all server running really slow even I could not restart NGINX. All was frozen. All my websites/applications run on dedicated server on UKFast, so none of websites would work because all is glued together. 
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