php 将 <br /> 转换为新行以在文本区域中使用
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Converting <br /> into a new line for use in a text area
提问by someguy
If I have a variable:
如果我有一个变量：
$var1 = "Line 1 info blah blah <br /> Line 2 info blah blah";
And a text area:
和一个文本区域：
<textarea>echo $var1</textarea>
How can I get the text area to display a new line instead of displaying the text on a single like with a <br />in it?
如何让文本区域显示一个新行，而不是在单个像中显示文本<br />？
Edit:I have tried the following:
编辑：我尝试了以下方法：
<textarea class="hobbieTalk" id="hobbieTalk" name="hobbieTalk" cols="35" rows="5" onchange="contentHandler('userInterests',this.id,this.value,0)"><?php
$convert=$_SESSION["hobbieTalk"];
$convert = str_replace("<br />", "\n", $convert);
echo $convert;
?></textarea>
However the text area still contains the brtags in the lines.
但是文本区域仍然包含br行中的标签。
回答by Mobilpadde
Try this one
试试这个
<?php
$text = "Hello <br /> Hello again <br> Hello again again <br/> Goodbye <BR>";
$breaks = array("<br />","<br>","<br/>");
$text = str_ireplace($breaks, "\r\n", $text);
?>
<textarea><?php echo $text; ?></textarea>
回答by aftamat4ik
i am use following construction to convert back nl2br
我正在使用以下结构来转换回 nl2br
function br2nl( $input ) {
return preg_replace('/<br\s?\/?>/ius', "\n", str_replace("\n","",str_replace("\r","", htmlspecialchars_decode($input))));
}
here i replaced \nand \rsymbols from $input because nl2br dosen't remove them and this causes wrong output with \n\nor \r<br>.
在这里，我替换了 $input 中的\n和\r符号，因为 nl2br 不会删除它们，这会导致错误输出\n\n或\r<br>。
回答by Jonathan
The answer by @Mobilpadde is nice. But this is my solution with regex using preg_replacewhich might be faster according to my tests.
@Mobilpadde 的回答很好。但这是我使用preg_replace使用正则表达式的解决方案，根据我的测试，它可能会更快。
echo preg_replace('/<br\s?\/?>/i', "\r\n", "testing<br/><br /><BR><br>");
echo preg_replace('/<br\s?\/?>/i', "\r\n", "testing<br/><br /><BR><br>");
function function_one() {
preg_replace('/<br\s?\/?>/i', "\r\n", "testing<br/><br /><BR><br>");
}
function function_two() {
str_ireplace(['<br />','<br>','<br/>'], "\r\n", "testing<br/><br /><BR><br>");
}
function benchmark() {
$count = 10000000;
$before = microtime(true);
for ($i=0 ; $i<$count; $i++) {
function_one();
}
$after = microtime(true);
echo ($after-$before)/$i . " sec/function one\n";
$before = microtime(true);
for ($i=0 ; $i<$count; $i++) {
function_two();
}
$after = microtime(true);
echo ($after-$before)/$i . " sec/function two\n";
}
benchmark();
Results:
结果：
1.1471637010574E-6 sec/function one (preg_replace)
1.6027762889862E-6 sec/function two (str_ireplace)
回答by Svetoslav Marinov
Here is another approach.
这是另一种方法。
class orbisius_custom_string {
/**
* The reverse of nl2br. Handles <br/> <br/> <br />
* usage: orbisius_custom_string::br2nl('Your buffer goes here ...');
* @param str $buff
* @return str
* @author Slavi Marinov | http://orbisius.com
*/
public static function br2nl($buff = '') {
$buff = preg_replace('#<br[/\s]*>#si', "\n", $buff);
$buff = trim($buff);
return $buff;
}
}
回答by Crashspeeder
EDIT: previous answer was backwards of what you wanted. Use str_replace.
replace <br>with \n
编辑：先前的答案与您想要的相反。使用 str_replace。替换<br>成\n
echo str_replace('<br>', "\n", $var1);
回答by Dan LaManna
<?php
$var1 = "Line 1 info blah blah <br /> Line 2 info blah blah";
$var1 = str_replace("<br />", "\n", $var1);
?>
<textarea><?php echo $var1; ?></textarea>
