问题
I'm working with a mysqldump file that has escaped character sequences. I need to know the length of a string as its database value, but the dump has escape characters in it, which add length to the string.
I've used stripslashes() which properly un-escapes single- and double-quotes, but it doesn't touch the \r\n.
I'm concerned there are other escaped character sequences in there that I'm not aware of. Is there a function I can use that will give me the true length of the string as it would be in the database? If I have to build my own function, what other sequences should it handle?
回答1:
The strip c slashes() function does exactly that:
stripcslashes('foo\r\n');
回答2:
You can use substr_count() to count characters in a string. Simply count how many backslashes are in the string:
$string = "... mysqldump string here ...";
$backslashes = substr_count($string, '\\');
That'll give you a rough count. To be 100% accurate, you'd have to count how many double backslashes there are, to account for literal backslashes, and adjust the count as appropriate.
来源：https://stackoverflow.com/questions/7178399/remove-escape-sequences-from-string-in-php