Full-width and half-width of the difference between input method

A What is the full-width and half-width?
(1) angle - a character occupies two standard character position.
Kanji characters and provides for the full-width English characters and the national standard GB2312-80 graphic symbols and special characters are full-width characters. The general command of the system do not have the full-width characters, just word processing will use the full-width characters.

(2) half-width - refers to the position occupied by a character of a standard character.
Usually letters of the alphabet, numeric keys, symbol keys are half-width, within a half-width of the display code is a byte. Within the system, these three characters are handled as a basic code, so the user input commands and parameters generally use half-width.

B full-width and half-width of each in what circumstances?
The full-width accounted for two-byte, half-width of one byte.
The half-width full-width punctuation, full-width punctuation accounted for two-byte, half-width of one byte, regardless of the half-width or full-width, Chinese characters, or to account for the two bytes.
Only in the source code of the programmed use of the half-width punctuation (excluding internal data string)
(In fact, this case simply does not exist the concept of full-width of the half-width on a computer that does not support Chinese characters and other languages ​​can only use half punctuate)

For most fonts, full angle looks larger than the half-width, of course this is not the essential difference.

C full-width and half-width of the difference between
The full-width is the width of letters and numbers, such as Chinese characters accounted position word. Half-width ASCII character way to do with the time from the Chinese character input method input alphanumeric characters are half-width.

Appear in the Chinese character input method, input alphanumeric default to half-width, but the punctuation is the default for the whole angle corresponding toolbar button mouse click input method.

D "full" and "half-width":
The whole angle: means in GB2312-80 (information exchange · basic set of Chinese ideograms coded character set ") in a variety of symbols.
Half-width: refers to the various symbols of the ASCII code of the English document.

Instead of cumbersome inefficient use of PHP5's __autoload the external file containing the way

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