Php conversion form textarea line break code

After my test form textarea line break, in windows it is rn, in linux it is n (this is not tested), in addition, in win, r, n have a line break function.

After my test form textarea line break, in windows it is rn, in linux it is n (this is not tested), in addition, in win, r, n have a line break function.

Escape characters:

N line feed (lf or ascii characters 0 × 0a (10 ))

R press enter (cr or ascii character 0 × 0d (13 ))

T horizontal tab (ht or ascii character 0 × 09 (9 ))

/Backslash

$ Dollar Sign

Double quotation marks

[0-7] {} the regular expression sequence matches a character represented by the octal symbol

X [0-9a-fa-f] {} this regular expression matches a character in a sequence expressed in hexadecimal notation

Conclusion: many friends say that the newline code n in textarea is like this in str_replace ("n ","
"), But we do not know that this is not the Windows standard line feed. we should change it to str_replace (" nr ","
") Then OK.