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Title : Avoiding or Detecting high bit characters in a string. Useful when you want to create a valid RSS feed
Categories : PHP, Strings, Unicode, Regexps, Rich Site Summary (RSS) Click here to Update Your Picture
Igal Rubinstein
Date : Jun 09th 2007
Grade : 2 of 5 (graded 2 times)
Viewed : 1444
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I had a mess with creating an RSS feed for http://www.weberforums.com.
each time someone would enter a post with some High Bit Characters such as Russian
or other non English characters that are considered as High Bit Chars the RSS geed
would not validate and fail.

I was looking for a way to check the text for such chars and skip these posts in
the RSS feed. Two ways I found are :


This look checks each char in the text. Valid chars are only between 32 and 126.
Two other valid chars I added were 10 (linefeed) and 13 (carriage return)

<?
   
for ($i=0 ; $i < strlen($post_text) ; $i++) {
       
$chr = $post_text{$i};
       
$ord = ord($chr);
        if ((
$ord<32 or $ord>126) and ($ord != 13) and ($ord != 10)){
            Echo
"BAD CHAR is : " . $ord;
            break;
        }   
    }
?>




After sending this topic to the PHP General list i got a response from
Abdullah Ramazanoglu with a different solution :

<?php
if (preg_match("/[\x80-\xff]/", $string)) {
       
# high-bit char found
} else {
       
# no high-bit char
}
?>


Hope this helps.



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