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Re: Purpose for a str_replace with an embedded print_r return

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Matthew Carter wrote:

> I did a quick test and there is a difference between using a plain
> string and a string wrapped in print_r when you store a
> an invalid character in the string and run the script via mod_php.
> 
> Try the following snippet:
> 
> <?php
> header('Content-type: text/html; charset=utf-8');
> 
> $string = chr(980); // Some garbage
> echo 'The echo: '.$string;
> echo 'The print_r: '.print_r($string, TRUE);
> ?>
> 
> You will notice that the character is not sent to the browser when
> passed through print_r (it is via the CLI though, so not sure if this is
> a mod_php feature).
> 
> Changing the encoding to ISO will pass it in both cases (as it is a
> valid character in that set).

According to the documentation[1] chr()

| Returns a one-character string containing the character specified by
| ascii.

However, you're passing 980, which is not a valid ASCII character.
Therefore the behavior of chr() could be regarded as undefined.
However, it seems that "all" PHP versions simply use only the low byte
of the input value, which is 212 (= 0xD4).[2]

While 212 is a valid ISO-8859-X character, it is not a (part of a) valid
UTF-8 sequence.  In a browser, usually invalid UTF-8 sequences are
displayed as Unicode REPLACEMENT CHARACTER (U+FFFD); how these are
displayed in a terminal window depends.

[1] <http://php.net/manual/en/function.chr.php>
[2] <http://3v4l.org/q92Pq>

-- 
Christoph M. Becker

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Thread

Purpose for a str_replace with an embedded print_r return Dave Patoch <earthlydilemma@gmail.com> - 2014-11-04 06:20 -0800
  Re: Purpose for a str_replace with an embedded print_r return "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-11-04 16:08 +0100
    Re: Purpose for a str_replace with an embedded print_r return Dave Patoch <earthlydilemma@gmail.com> - 2014-11-04 07:27 -0800
      Re: Purpose for a str_replace with an embedded print_r return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-11-04 16:58 +0100
        Re: Purpose for a str_replace with an embedded print_r return "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-11-04 18:58 +0100
          Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-04 13:54 -0500
            Re: Purpose for a str_replace with an embedded print_r return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-11-05 14:27 +0100
              Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 08:46 -0500
                Re: Purpose for a str_replace with an embedded print_r return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-11-05 15:32 +0100
                Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 10:44 -0500
                Re: Purpose for a str_replace with an embedded print_r return Matthew Carter <m@ahungry.com> - 2014-11-05 15:50 -0500
                Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 16:59 -0500
                Re: Purpose for a str_replace with an embedded print_r return "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-11-05 23:56 +0100
                Re: Purpose for a str_replace with an embedded print_r return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-11-06 04:30 +0100
                Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 22:53 -0500
  Re: Purpose for a str_replace with an embedded print_r return Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-05 15:07 +0000
    Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 10:47 -0500
      Re: Purpose for a str_replace with an embedded print_r return Matthew Carter <m@ahungry.com> - 2014-11-05 15:51 -0500
        Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 17:00 -0500
          Re: Purpose for a str_replace with an embedded print_r return Matthew Carter <m@ahungry.com> - 2014-11-05 22:35 -0500
            Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 22:55 -0500
            Re: Purpose for a str_replace with an embedded print_r return Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-06 04:26 +0000
              Re: Purpose for a str_replace with an embedded print_r return Matthew Carter <m@ahungry.com> - 2014-11-06 00:09 -0500
                Re: Purpose for a str_replace with an embedded print_r return Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-06 23:59 +0000
            Re: Purpose for a str_replace with an embedded print_r return "Christoph M. Becker" <cmbecker69@arcor.de> - 2014-11-06 18:43 +0100
        Re: Purpose for a str_replace with an embedded print_r return Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-06 02:39 +0000
      Re: Purpose for a str_replace with an embedded print_r return Denis McMahon <denismfmcmahon@gmail.com> - 2014-11-06 02:44 +0000
        Re: Purpose for a str_replace with an embedded print_r return Jerry Stuckle <jstucklex@attglobal.net> - 2014-11-05 22:56 -0500

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