如何在php中替換½與.5

Question

如何用字符串替換特殊字符½與.5中的字符串7½。我想輸出字符串爲7.5

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

沒有更換爲0.5

Answer 1

你嘗試過：

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

Answer 2

str_replace函數更快，比preg_replace函數，並且也做的伎倆

$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);