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
<?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
其他回答
你需要:
$ro = preg_replace('/\s+/', ' ', $row['message']);
您正在使用的\s\s+表示空格(空格、制表符或换行符)后面跟着一个或多个空格。这实际上意味着用一个空格替换两个或多个空格。
你想要的是用单个空格替换一个或多个空格，所以你可以使用模式\s\s*或\s+(推荐)
没有preg_replace ()
$str = "This is a Text \n and so on \t Text text.";
$str = str_replace(["\r", "\n", "\t"], " ", $str);
while (strpos($str, " ") !== false)
{
$str = str_replace(" ", " ", $str);
}
echo $str;
<?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
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。
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.
