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How to remove spaces and line breaks in php

Jul 03, 2020 am 10:58 AM
php

php去掉空格换行的方法:1、使用“str_replace”来替换,语法为“$str = str_replace(array("\r\n", "\r", "\n"), "", $str);”;2、使用正则替换;3、使用php定义好的变量。

How to remove spaces and line breaks in php

php去掉空格换行

PHP

PHP中有\r \r\n \t等多个隐藏字符,我们一般在源代码里面都看不到这些字符,但是他们却真实的存在,下面我们来说说他们都有那些区别。

\n 软回车:

在Windows 中表示换行且回到下一行的最开始位置。相当于Mac OS 里的 \r 的效果。

在Linux、unix 中只表示换行,但不会回到下一行的开始位置。

\r 软空格:

在Linux、unix 中表示返回到当行的最开始位置。

在Mac OS 中表示换行且返回到下一行的最开始位置,相当于Windows 里的 \n 的效果。

\t 跳格(移至下一列)。

它们在双引号或定界符表示的字符串中有效,在单引号表示的字符串中无效。

\r\n 一般一起用,用来表示键盘上的回车键,也可只用 \n。

\t表示键盘上的“TAB”键。

就像你使用 enter 和 shift+enter 的区别,如果要显示在页面上的效果还要转化为 HTML 代码或用…

文件中的换行符号:

linux,unix:     \r\n
 windows    :     \n
 Mac OS   :   \r
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对应:

\n LF或ASCII中的0x0A(10)
\r CR或ASCII中的0x0D(13)
\t 水平制表符-HT或ASCII中的0x09(9)
\\ 反斜杠
\$ 美圆符
\” 双引号
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删除方法

在PHP中有多种方法可以删除这样烦人的隐藏字符,请看下面的介绍。

1、使用str_replace 来替换

$str = str_replace(array("\r\n", "\r", "\n"), "", $str);
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2、使用正则替换

$str = preg_replace('//s*/', '', $str);
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3、使用php定义好的变量 (建议使用)

$str = str_replace(PHP_EOL, '', $str);
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当然我们可以把他定义成一个函数,然后一起替换,这样可以重复使用这个代码片段。

function trimall($str){
    $qian=array(" "," ","\t","\n","\r");
    return str_replace($qian, '', $str);   
}
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显示隐藏字符

我们不知道这个隐藏字符是什么,但是我们可以通过PHP的nl2br转为前台可显示的换行,然后对症下药,即可轻松解决换行和空格字符串问题。

$str = "a
b
e
f
c";
echo nl2br($str);
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