简化为一个函数:

function removeWhiteSpace($text)
{
    $text = preg_replace('/[\t\n\r\0\x0B]/', '', $text);
    $text = preg_replace('/([\s])\1+/', ' ', $text);
    $text = trim($text);
    return $text;
}

基于丹尼尔·奥尼尔的答案。

<?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);

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);

你所需要的就是像下面这样运行它:

echo preg_replace('/\s{2,}/', ' ', "This is   a Text \n and so on \t     Text text."); // This is a Text and so on Text text.

preg_replace('/(\s\s+|\t|\n)/', ' ', $row['message']);

这将用一个空格替换所有制表符、换行符以及多个空格、制表符和换行符的所有组合。

<?php
$str = "This is  a string       with
spaces, tabs and newlines present";

$stripped = preg_replace(array('/\s{2,}/', '/[\t\n]/'), ' ', $str);

echo $str;
echo "\n---\n";
echo "$stripped";
?>

这个输出

This is  a string   with
spaces, tabs and newlines present
---
This is a string with spaces, tabs and newlines present