Why utf 8 without bom

The picture below shows the bytes used in a sequence of two-byte characters. Each 2-digit hexadecimal number represents a byte in the stream of text. You can see that the order of the two bytes that represent a single character is reversed for big endian vs.

The byte-order mark indicates which order is used, so that applications can immediately decode the content. However, the BOM may still occur in UTF-8 encoded text, either as a by-product of an encoding conversion or because it was added by an editor to flag the content as UTF Most of the time you will not have to worry about the byte-order mark in UTF You will find that some editors such as Notepad on Windows will always add a BOM when you save a file with the UTF-8 encoding, others will offer you a choice.

However, bear in mind that it is always a good idea to declare the encoding of your page using the meta element, in addition to the BOM, so that the encoding is apparent to people looking at the source text. Also there are a number of situations where the BOM, particularly because it is invisible, may cause a problem. See the section below for more information about those. If you use a UTF encoding for your page and we strongly recommend that you don't , there are some additional considerations.

You can find out whether a page contains a BOM at the start or further down in the content by using the W3C Internationalization Checker. A BOM at the start of the page will be reported in the Information panel. Text encoding causes the concept of byte order, only that those who set standards are too rigid. For utf, I think that as long as the whole world follows a byte-order approach, there's no need to label it with a BOM. In other words, PHP does not support utf encoded files.

It is not known if PHP6 internal processing introduces the concept of Unicode, whether this will be supported. The coding problem is a simple, but actually cumbersome thing to say. Many programs have the concept of layered coding. Storage is also divided into system,database,table,column. I sometimes think it's necessary to be so complicated, tnnd. Like MySQL, who uses it for these traits? Unless two clients are allowed to operate in different coding environments, it is not necessary to separate the client code.

The byte-order mark or BOM eng. The specifications, its use is not mandatory, however, if the byte-order mark is used, it should be installed at the beginning of the text file. In addition to its specific use as a pointer byte order, the character can also specify which Unicode encoded text. Unicode can use bit or bit numbers, and the app needs to know how to deal with them. The byte order mark is useless for UTF They only used for UTF so they know which byte order is first. Opinions expressed by DZone contributors are their own.

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