note 93884 added to function.substr
| From: | kaj dot strom at kapsi dot fi | Date: | Mon, 05 Oct 2009 11:42:19 +0000 |
| Subject: | note 93884 added to function.substr | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-161346@lists.php.net to get a copy of this message | ||
One thing to keep in mind when using string indexes and UTF-8 is that string indexes are NOT
multi-byte safe.
<?php
$string = 'äää1';
echo $string[3];
?>
Outputs:
¤
When it logically should output "1". This is not a bug, as PHP 'normal' string
functions are not intended to be multi-byte safe. This can be solved by using this function
<?php
/**
*
* @param string $string String to "search" from
* @param int $index Index of the letter we want.
* @return string The letter found on $index.
*/
function charAt($string, $index){
if($index < mb_strlen($string)){
return mb_substr($string, $index, 1);
}
else{
return -1;
}
}
?>
----
Server IP: 62.237.7.3
Probable Submitter: 94.22.124.78
----
Manual Page -- http://www.php.net/manual/en/function.substr.php
Edit -- https://master.php.net/note/edit/93884
Del: integrated -- https://master.php.net/note/delete/93884/integrated
Del: useless -- https://master.php.net/note/delete/93884/useless
Del: bad code -- https://master.php.net/note/delete/93884/bad+code
Del: spam -- https://master.php.net/note/delete/93884/spam
Del: non-english -- https://master.php.net/note/delete/93884/non-english
Del: in docs -- https://master.php.net/note/delete/93884/in+docs
Del: other reasons-- https://master.php.net/note/delete/93884
Reject -- https://master.php.net/note/reject/93884
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