PHP strip tags also removing \n

Question

I'm using strip_tags in PHP and after it has processed the string, the string now also contains no \n's..

Is this standard with strip_tags?

Answer 1

The purpose of stripcslashes is to remove \n \r etc as indicated here.

http://www.php.net/manual/en/function.stripcslashes.php

Is there anything else in your code you can provide?

A test with a simple:

$str = "This is a test \n \n \n \n where are you going?";

echo strip_tags($str);

// still will print out the first sentence followed by four lines then the second sentence

Answer 2

Strip_tags should not remove \n but maybe it removes <br>.

Try adding a list of tags to permit:

strip_tags('Hello<br>World', '<br>');

this shold allow <br> tags to stay in the string.

Answer 3

Well, is it so hard to test? :)

class StripTagsTest extends PHPUnit_Framework_TestCase {
    public function testStripTagsShouldNotRemoveLF() {
        $input = "Hello\n <b>World</b>\n";
        $actual = strip_tags($input);
        $expected = "Hello\n World\n";
        $this->assertEquals($expected, $actual);
    }

   public function testStripTagsRemovesBRTagByDefault() {
        $expected = "HelloWorld\n";
        $input = "Hello<br>World<br>\n";
        $actual = strip_tags($input);
        $this->assertEquals($expected, $actual);

        $input = "Hello</br>World</br>\n";
        $actual = strip_tags($input);
        $this->assertEquals($expected, $actual);
    }

    public function testStripTagsCanPermitBRTags() {
        $expected = "Hello<br>World<br>\n";
        $actual = strip_tags($expected, '<br>');
        $this->assertEquals($expected, $actual);

        $expected = "Hello</br>World</br>\n";
        $actual = strip_tags($expected, '<br>');
        $this->assertEquals($expected, $actual);
    }
}

This test will pass. The same result is while using single quotes. So, no, strip_tags doesn't remove \n.

EDIT: Just as already other people here pointed out - strip_tags probably removes <br> tag in your case. Also, next time, if you provide some code, you will get your answer quicker. Added two new tests :)