PHP - how to create a newline character?

2019-01-01 17:03发布

站内问答 / PHP
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In PHP I am trying to create a newline character:

echo $clientid;
echo ' ';
echo $lastname;
echo ' ';
echo '\r\n';

Afterwards I open the created file in Notepad and it writes the newline literally:

1 John Doe\r\n 1 John Doe\r\n 1 John Doe\r\n

I have tried many variations of the \r\n, but none work. Why isn't the newline turning into a newline?

13条回答
只靠听说
2楼-- · 2019-01-01 17:34

For any echo statements, I always use <br> inside double quotes.

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永恒的永恒
3楼-- · 2019-01-01 17:37

For some reason, every single post asking about newline escapes in PHP fails to mention the case that simply inserting a newline into single-quoted strings will do exactly what you think:

ex 1.

 echo 'foo\nbar';

Example 1 clearly does not print the desired result, however, while it is true you cannot escape a newline in single-quotes, you can have one:

ex 2.

 echo 'foo
 bar';

Example 2 has exactly the desired behavior. Unfortunately the newline that is inserted is operating system dependent. This usually isn't a problem, as web browsers/servers will correctly interpret the newline whether it is \r, \r\n, or \n.

Obviously this solution is not ideal if you plan to distribute the file through other means then a web browser and to multiple operating systems. In that case you should see one of the other answers.

note: using a feature rich text editor you should be able to insert a newline as a binary character(s) that represents a newline on a different operating system than the one editing the file. If all else fails, simply using a hex editor to insert the binary ascii character would do.

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姐姐魅力值爆表
4楼-- · 2019-01-01 17:39

I have also tried this combination within both the single quotes and double quotes. But none has worked. Instead of using \n better use <br/> in the double quotes. Like this..

$variable = "and";
echo "part 1 $variable part 2<br/>";
echo "part 1 ".$variable." part 2";
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心情的温度
5楼-- · 2019-01-01 17:41

Actually \r\n is for the html side of the output. With those chars you can just create a newline in the html code to make it more readable:

echo "<html>First line \r\n Second line</html>";

will output:

<html>First line
Second line</html>

that viewing the page will be:

First line Second line

If you really meant this you have just to fix the single quote with the "" quote:

echo "\r\n";

Otherwise if you mean to split the text, in our sample 'First line' and 'Second line' you have to use the html code: <br />:

First line<br />Second line

that will output:

First line
Second line

Also it would be more readable if you replace the entire script with:

echo "$clientid $lastname \r\n";
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柔情千种
6楼-- · 2019-01-01 17:42

For platform independent line ending you can use the predefined PHP_EOL constant, as in:

echo $clientid, ' ', $lastname, PHP_EOL;
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浪荡孟婆
7楼-- · 2019-01-01 17:42

Use the constant PHP_EOL to get the right character no matter the platform.

http://us3.php.net/manual/en/reserved.constants.php

A simple usage example:

<?php
$data = 'First line' . PHP_EOL .
        'Second line' . PHP_EOL .
        'Third line';

file_put_contents("filename.txt", $data);
?>
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