如何在php中替换½替换½与.5

Question

如何在字符串7½中用.5替换特殊字符½。我想输出字符串为7.5

preg_replace('/\x{EF}\x{BF}\x{BD}/u', '.5', iconv(mb_detect_encoding($str), 'UTF-8', $str));

不会替换为.5

Answer 1

你试过了吗？

$str = "how to replace special character ½ with .5 in a string 7½. i want to output string as 7.5";
echo preg_replace('/½/u', '.5', iconv(mb_detect_encoding($str), 'UTF-8', $str));
//or
echo preg_replace('/½/u', '.5', $str);
//or
echo preg_replace('/½/', '.5', $str);

Answer 2

str_replace比preg_replace更快，并且还有技巧

$str = "how to replace special character ½ with .5 in a string 7½. i want to output string as 7.5";

echo str_replace('½', '.5', $str);