C2a0 And 20 String Comparision - Php - Stack Overflow

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Learn more about Labs c2a0 and 20 string comparision Ask Question Asked 8 years, 10 months ago Modified 2 years, 6 months ago Viewed 3k times Part of PHP Collective 6

I have two utf-8 strings:

• one saved as variable in php file (saved in UTF-8)
• another gets externally from another with regular expression.

When I compare those two same space-separated strings, the result is false, meaning that they are not the same.

• The string I saved as a variable is rendered as 20 with bin2hex (ascii encoded space symbol)
• The string I got externally, processed with mb_strtolower($string, 'utf-8') is rendered as c2a0 with bin2hex (utf-8 space)

My questions is:

1. Why when I save in utf-8 string not fully encoded as utf-8 (meaning space in ascii)?
2. How to get rid of that problem?

• php
• regex
• utf-8

Share Improve this question Follow edited Jan 21, 2016 at 14:43 zessx 68.7k2828 gold badges137137 silver badges164164 bronze badges asked Jan 21, 2016 at 14:14 VelaroVelaro 50111 gold badge44 silver badges2121 bronze badges 1

• 6 c2a0 is a no-break space whereas 20 is a space. – bobble bubble Commented Jan 21, 2016 at 14:18

Add a comment |

1 Answer 1

Sorted by: Reset to default Highest score (default) Trending (recent votes count more) Date modified (newest first) Date created (oldest first) 4

As said in the comments c2a0 is a no-break space and 20 is normal space

Since you can see the problem in bin2hex you could:

$str = hex2bin(str_replace('c2a0', '20', bin2hex($str)));

or to put that another way:

$str = preg_replace('~\xc2\xa0~', ' ', $str); // typo corrected Share Improve this answer Follow edited May 8, 2022 at 21:25 user2373839 133 bronze badges answered Sep 23, 2016 at 12:25 Ad WicksAd Wicks 30033 silver badges1010 bronze badges Add a comment |

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