unicode preg_replace problem in php

Question

I\'ve got the string

$result = \"bei einer Temperatur, die etwa 20 bis 60°C unterhalb des Schmelzpunktes der kristallinen Modifikation\"

wh

Answer 1

If you use the 'u' modifier, the pattern is supposed to be treated as utf-8, so why not simply write '°' instead of '\u00B0' or '\xB0'?

Answer 2

Use

$result = preg_replace('/\x{00B0}/u'," degrees ", $result );

Please see here for more information on the \x{FFFF}-syntax.

It's important to note the difference between \xB0 and \x{00B0}:

• \xB0 denotes a single character with hex-code B0 (176 decimal) which is the degree symbol (°) in ISO-8859-1 for example
• \x{00B0} denotes the unicode codepoint U+00B0 which describes the degree symbol (°) in the unicode system. This codepoint will be encoded using two bytes \xC2\xB0 when using UTF-8 encoding.