Method for implementing line wrapping of PHP stored text in the first volume of Chinese textbook for sixth grade primary school students

n 0x0A (10) in LF or ASCII
r 0x0D (13) in CR or ASCII
t Horizontal tab - 0x09 (9) in HT or ASCII
\ backslash
$ dollar sign
" double quote
' single quote
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windows: rn
linux, unix: n
php function similar to response.end in asp is exit( ) or die()
Judge the numeric function is_numeric()

The above introduces the implementation method of PHP storage text line wrapping in the first volume of Chinese textbook for sixth grade primary school, including the content of the first volume Chinese textbook for sixth grade primary school. I hope it will be helpful to friends who are interested in PHP tutorials.