Detailed explanation of how PHP converts full-width symbols in text to half-width

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Release: 2023-03-19 06:28:01
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PHP如何将文本中的全角符号转为半角?本文将分享一个封装好的转换方法,大家可以参考一下。希望对大家有所帮助。

将一个字串中含有全角的数字字符、字母、空格或'%+-()'字符转换为相应半角字符

/** * 将一个字串中含有全角的数字字符、字母、空格或'%+-()'字符转换为相应半角字符 * @access public * @param string $str 待转换字串 * @return string $str 处理后字串 */ function make_semiangle($str) { $arr = array('0' => '0', '1' => '1', '2' => '2', '3' => '3', '4' => '4','5' => '5', '6' => '6', '7' => '7', '8' => '8', '9' => '9', 'A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E','F' => 'F', 'G' => 'G', 'H' => 'H', 'I' => 'I', 'J' => 'J', 'K' => 'K', 'L' => 'L', 'M' => 'M', 'N' => 'N', 'O' => 'O','P' => 'P', 'Q' => 'Q', 'R' => 'R', 'S' => 'S', 'T' => 'T',U' => 'U', 'V' => 'V', 'W' => 'W', 'X' => 'X', 'Y' => 'Y','Z' => 'Z', 'a' => 'a', 'b' => 'b', 'c' => 'c', 'd' => 'd','e' => 'e', 'f' => 'f', 'g' => 'g', 'h' => 'h', 'i' => 'i','j' => 'j', 'k' => 'k', 'l' => 'l', 'm' => 'm', 'n' => 'n','o' => 'o', 'p' => 'p', 'q' => 'q', 'r' => 'r', 's' => 's', 't' => 't', 'u' => 'u', 'v' => 'v', 'w' => 'w', 'x' => 'x', 'y' => 'y', 'z' => 'z','(' => '(', ')' => ')', '〔' => '[', '〕' => ']', '【' => '[','】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']','‘' => '[', ''' => ']', '{' => '{', '}' => '}', '《' => '<','》' => '>','%' => '%', '+' => '+', '—' => '-', '-' => '-', '~' => '-',':' => ':', '。' => '.', '、' => ',', ',' => '.', '、' => '.', ';' => ',', '?' => '?', '!' => '!', '…' => '-', '‖' => '|', '”' => '"', ''' => '`', '‘' => '`', '|' => '|', '〃' => '"',' ' => ' '); return strtr($str, $arr); }
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"; $str = preg_replace('/\xa3([\xa1-\xfe])/e', 'chr(ord(\1)-0x80)', $str); echo $str; ?>
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另外为大家分享一个函数
在许多收集用户信息的表单里,期望用户输入的是半角字符,但是无论你如何强调,如何提醒,还是会有粗心的用户提交全角数据,其实,在一些新手眼中,全角和半角根本就没有区别,甚至他们会觉得:我提交的明明是正确的信息,为什么会提示错误呢?

实际上,全角和半角有一一对应关系,而大多数用户并非故意输入错误的信息,所以,我们可以通过程序来避免这种情况的发生,最多,可以在转换后给用户一个确认的机会,这样,或许能够给用户一个更好的体验。

下面介绍一个函数,实现字符 半角 和 全角 之间的互转

', '"', '\'','?', '[', ']', '{', '}', '\\', '|', '+', '=', '_', '^', '$', '~', '`' ); if ($args2 == 0) { return str_replace($SBC, $DBC, $str); // 半角到全角 } else if ($args2 == 1) { return str_replace($DBC, $SBC, $str); // 全角到半角 } else { return false; } } $str1 = "http://"; $str2 = "http://"; echo "半角 转 全角:
"; echo $str1 . ' -> ' . SBC_DBC($str1, 0); echo "

全角 转 半角:
"; echo $str2 . ' -> ' . SBC_DBC($str2, 1); ?>
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