Things to remeber in linux

• Display All Information About Files/Directories Using ls -l

  
  

Things to remeber in html

• text box width is set by style property only style="width:20px" not by width property <input type="text" id="text1" name="text1" style="width:20px" />
• For putting html in the blogger you should go to this site and encode the code http://centricle.com/tools/html-entities/
  
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Things to remeber in php

Things to remember in php so that you don't dependent on google and manual.

• To push values in array $stack.
  

array_push($stack, "apple", "raspberry");

• preg_split used in youngib api for commandline interface .
  array preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

Indexing in database

• An index is a separate file that is sorted, and contains only the field/s you're interested in sorting on. If you create an index on employee_number, MySQL can find the corresponding record very quickly (Indexes work in very similar ways to an index in a book. Imagine paging through a technical book (or more often, an scrambled pile of notes!) looking for the topic "Optimizing MySQL". An index saves you an immense amount of time!
• http://www.databasejournal.com/features/mysql/article.php/1382791/Optimizing-MySQL-Queries-and-Indexes.htm
  

Css Learning

• white-space:no-wrap to make text in a line .
• vertical-align:middle; display:table-cell will not work with float so advise to insert a div cover for entering float .
• Use Float left to all the div in the container with the width specified.
• Use Position:relative for parent div , and absolute for child div for positioning.
• For Floating image use overflow:hidden;
• Use CSS selectors .e.g. > * for select adjacent child divs. Check this link for more css selectors.
• Z-index of elements should be check in the same Containers., And position should be absolute of the other element.
  

Regular Expressions

Regular Expression of Email:
string :rahul@gmail.com
exp.:([a-z])+@([a-z])+\.([a-z])+([a-z])

Passwords cannot contain sequences of 3 or more of the same character
(.)\1\1

• # the following expression finds double characters
  (.)\1
  

Brackets, Ranges and Negation[],- ^

Positioning (or Anchors)^,$,.

• The ^ (circumflex or caret) outside square brackets means look only at the beginning of the target string, for example,
• The $ (dollar) means look only at the end of the target string, for example, fox$ will
• The . (period) means any character(s) in this position,

Iteration MetaCharcters ?,* ,+,{n},{}

• The ? (question mark) matches the preceding character 0 or 1 times only

• The * (asterisk or star) matches the preceding character 0 or more times
• The + (plus) matches the previous character 1 or more times,
• {n} Matches the preceding character n times exactly
• {n,m} Matches the preceding character at least n times but not more than m times,

More metacharacters()|

Submatches, Groups and Backreferences

for testing and article Please follow
http://www.zytrax.com/tech/web/regex.htm

Best Coding Practices

• The more code you have the more possible to make errors and the more code you have to maintain.
• Use Plugins are around to make life easier after all to write less code
• Never write html code in the js files , always put html code in html file , and access html element in jquery .
  Object Oriented Programming
  
• Don't put Parent Class in the Child Class , always pass the data to the child class from the Parent Class. e.g. App is parent Class then App should not be in the Child Class . Because it is the method of abstraction.
  
• Put the Code related to the Class only in Class else put in Project (App) Class of the Project.
• To Pass the Parent Class use the context .e.g. for passing config variable to the child class.
• Each Class is separate entity and should be complete,not dependent on any class and should not give error if something changed in other class.
• Best OOPS Principles http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
• http://www.dofactory.com/Patterns/Patterns.aspx