PHP Regular expression filter space line break Enter _php tutorial

One, the following example can remove additional whitespace

The code is as follows

$STR = "This line containstliberal RN use of whitespace.nn"; First remove the leading/trailing whitespace Remove the opening and closing blanks www.111cn.net $str = Trim ($STR); Now remove any doubled-up whitespace Remove the blank that follows the other squeeze $str = Preg_replace ('/s (? =s)/', ' ', $str); Finally, replace any non-space whitespace, with a space Finally, remove the non-space space, with a space instead $str = preg_replace ('/[nrt]/', ' ', $str); Echo out: ' This line contains liberal use of whitespace. ' echo " {$STR} "; ?>

Second, replace the line break

PHP has three ways to solve

The code is as follows
1. Use Str_replace to replace line breaks $str = Str_replace (Array ("RN", "R", "N"), "", $str); 2. Use regular replacement $str = preg_replace ('//s*/', ' ', $str); 3. Use PHP-defined variables (recommended) $str = Str_replace (Php_eol, ", $STR);

The code is as follows:

The code is as follows
/* * Get the user's operating system line break, n * @access Public * @return String */ function Get_crlf () { if (Stristr ($_server[' http_user_agent '), ' Win ') { $the _crlf = ' RN '; } ElseIf (Stristr ($_server[' http_user_agent '), ' Mac ') { $the _crlf = ' R '; For-old MAC OS } Else { $the _crlf = ' n ';//Right important point www.111cn.net } return $the _crlf; }

Note: When the foreground page is displayed, use NL2BR to change the line to

Third, replace the carriage return

The code is as follows

PHP line breaks for different systems The implementation of line breaks between different systems is not the same Linux and Unix with/n MAC with/R Window is/r/n in order to show that it is different from Linux So the implementation method on different platforms is not the same PHP has three ways to solve 1. Use Str_replace to replace line breaks $str = Str_replace (Array ("/r/n", "/R", "/n"), "", $str); 2. Use regular replacement $str = preg_replace ('//s*/', ' ', $str); 3. Use PHP-defined variables (recommended) $str = Str_replace (Php_eol, ", $STR); ?>

http://www.bkjia.com/PHPjc/727587.html www.bkjia.com true http://www.bkjia.com/PHPjc/727587.html techarticle One, the following example can remove the additional blank code as follows? PHP $str = This line containstliberal rn use of whitespace.nn;//First remove the leading/trailing whitespace//Remove start and end ...

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