我得到$row['message']从一个MySQL数据库,我需要删除所有的空白,如\n \t等。

$row['message'] = "This is   a Text \n and so on \t     Text text.";

应格式化为:

$row['message'] = 'This is a Text and so on Text text.';

我试着:

 $ro = preg_replace('/\s\s+/', ' ',$row['message']);
 echo $ro;

但它不删除\n或\t,只删除单个空格。有人能告诉我怎么做吗?


当前回答

preg_replace('/[\s]+/mu', ' ', $var);

\s已经包含制表符和新行,所以上面的正则表达式似乎足够了。

其他回答

<?php
#This should help some newbies
# REGEX NOTES FROM DANUEL
# I wrote these functions for my own php framework
# Feel Free to make it better
# If it gets more complicated than this. You need to do more software engineering/logic.
# (.)  // capture any character
# \1   // if it is followed by itself
# +    // one or more

class whitespace{

    static function remove_doublewhitespace($s = null){
           return  $ret = preg_replace('/([\s])\1+/', ' ', $s);
    }

    static function remove_whitespace($s = null){
           return $ret = preg_replace('/[\s]+/', '', $s );
    }

    static function remove_whitespace_feed( $s = null){
           return $ret = preg_replace('/[\t\n\r\0\x0B]/', '', $s);
    }

    static function smart_clean($s = null){
           return $ret = trim( self::remove_doublewhitespace( self::remove_whitespace_feed($s) ) );
    }
}
$string = " Hey   yo, what's \t\n\tthe sc\r\nen\n\tario! \n";
echo whitespace::smart_clean($string);

没有preg_replace,在loop的帮助下。

<?php

$str = "This is   a Text  and so on      Text text.";
$str_length = strlen($str);
$str_arr = str_split($str);
for ($i = 0; $i < $str_length; $i++) {
    if (isset($str_arr[$i + 1])
       && $str_arr[$i] == ' '
       && $str_arr[$i] == $str_arr[$i + 1]) {
       unset($str_arr[$i]);
    } 
    else {
      continue;
    }
}

 echo implode("", $str_arr) ; 

 ?>

我不能在这里重复这个问题:

$x = "this    \n \t\t \n    works.";
var_dump(preg_replace('/\s\s+/', ' ', $x));
// string(11) "this works."

我不确定这是否只是一个转录错误,但在您的示例中,您使用的是单引号字符串。如果有双引号字符串,\n和\t只被当作换行符和制表符。那就是:

'\n\t' != "\n\t"

编辑:正如Codaddict指出的那样,\s\s+不会取代一个制表符。我仍然不认为使用\s+是一个有效的解决方案,所以这样如何:

preg_replace('/(?:\s\s+|\n|\t)/', ' ', $x);

这将用一个选项卡替换多个选项卡

preg_replace("/\s{2,}/", "\t", $string);

我使用以下代码和模式:

preg_replace('/\\s+/', ' ',$data)

$data = 'This is   a Text 
   and so on         Text text on multiple lines and with        whitespaces';
$data= preg_replace('/\\s+/', ' ',$data);
echo $data;

您可以在http://writecodeonline.com/php/上进行测试