On 7/2/2012 7:15 PM, Robert Williams wrote:
I found this code in a user comment in the PHP docs for htmlentities():

<?php

function xml_character_encode($string, $trans='') {
$trans = (is_array($trans)) ? $trans : 
get_html_translation_table(HTML_ENTITIES, ENT_QUOTES);
foreach ($trans as $k=>$v)
$trans[$k]= "&#".ord($k).";";

return strtr($string, $trans);
}

?>

It seems to work. For instance, this (assuming UTF-8 encoding):

echo xml_character_encode('Ch√Ęteau');
echo "\n";
echo xml_character_encode('Ch&teau');

Yields this:

Ch&#195;&#162;teau
Ch&#38;teau

My question is, *how* does it work? It makes sense right up to the return statement. 
According to the docs for strstr(), when a non-string is passed in as the needle, it's, 
"converted to an integer and applied as the ordinal value of a character." 
First, an array-to-int conversion is undefined, though it seems to produce 1 on my copy 
of PHP. Now, I'm not quite sure how to interpret the last part of that statement from the 
docs, but I take it that the ultimate value supplied to strstr() is going to be either 
'1' (the character value of the integer value of the array) or '49' (the ordinal value of 
the character '1'). Whatever, neither one makes sense to look for in the haystack, so I'm 
obviously missing something.

I think you missed something here...

The above function uses strtr() not strstr()

http://php.net/strtr
http://php.net/strstr


Perhaps it's just late-Monday slowness on my part, but what's going on here? I 
have no intention of using this code, but I'd sure like to understand how it 
works!


Regards,
Bob
--
Robert E. Williams, Jr.
Associate Vice President of Software Development
Newtek Businesss Services, Inc. -- The Small Business Authority
https://www.newtekreferrals.com/rewjr
http://www.thesba.com/

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