\ x1a字符是什么意思 [英] What does the \x1a characters mean
问题描述
\x1a字符是什么意思，为什么mysql_real_escape_string会转义它?
What does the \x1a character mean and why does mysql_real_escape_string escape it?
从文档中:
mysql_real_escape_string()调用MySQL的库函数mysql_real_escape_string，该函数将反斜杠添加到以下字符前:\ x00，\ n，\ r，\，'，'和\ x1a.
mysql_real_escape_string() calls MySQL's library function mysql_real_escape_string, which prepends backslashes to the following characters: \x00, \n, \r, \, ', " and \x1a.
ASCII字符参考将其描述为Substitute character，但这并不多.
A ASCII Characters reference describes it as Substitute character, but this doesn't say much.
推荐答案
这是Unicode 转义序列，以十六进制(基数16). \x1a是替代"字符.
It's a Unicode escape sequence, in hexadecimal (base 16). \x1a is the "substitute" character.
另请参阅: http://en.wikipedia.org/wiki/Substitute_character
See also: http://en.wikipedia.org/wiki/Substitute_character
为什么
mysql_real_escape_string逃脱了它?
严格来说，MySQL仅要求转义反斜杠和用于对查询中的字符串加引号的引号字符.
mysql_real_escape_string()引用其他字符以使它们更易于在日志文件中阅读.
Strictly speaking, MySQL requires only that backslash and the quote character used to quote the string in the query be escaped.
mysql_real_escape_string()quotes the other characters to make them easier to read in log files.
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