str_replace question

jmark.RemoveThis@fastermail.com wrote:
> I saw this example in php.net
>
> // Outputs: apearpearle pear
> $letters = array('a', 'p');
> $fruit = array('apple', 'pear');
> $text = 'a p';
> $output = str_replace($letters, $fruit, $text);
> echo $output;
>
> and I am bit puzzled why the output is the way it is instead of
>
> apple pear
>
> it looks like str_replace is replacing the p in apple to pear but why
> does not replace the p in pear to pear and the a to apple and why is
> the output not "apple pear"?
>
> Thanks
> John
>

John,

I haven't looked at the source code, but I would expect it does would be
effectively the same as:

$output = str_replace('a', 'apple', 'a p');
$output = str_replace('p', 'pear', '$output);

Which produces the same output.



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==================
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On Aug 13, 2:44 am, gosha bine <stereof....DeleteThis@gmail.com> wrote:
> On 12.08.2007 21:45 jm....DeleteThis@fastermail.com wrote:
>
>
>
>
>
> > I saw this example in php.net
>
> > // Outputs: apearpearle pear
> > $letters = array('a', 'p');
> > $fruit = array('apple', 'pear');
> > $text = 'a p';
> > $output = str_replace($letters, $fruit, $text);
> > echo $output;
>
> > and I am bit puzzled why the output is the way it is instead of
>
> > apple pear
>
> > it looks like str_replace is replacing the p in apple to pear but why
> > does not replace the p in pear to pear and the a to apple and why is
> > the output not "apple pear"?
>
> what you probably want is strtr
>
> $repl = array('a' => 'apple', 'p' => 'pear');
> $text = 'a p';
> echo strtr($text, $repl);
>
> --
> gosha bine
>
> makrell ~http://www.tagarga.com/blok/makrell
> php done right ;)http://code.google.com/p/pihipi- Hide quoted text -
>
> - Show quoted text -

Thanks for showing me this function. I like it

jmark wrote:

> I had thought that str_replace replaces all elements in the array at
> the same time. I think this would have been a more intuitive approach

That would be the most sensible thing to do, but PHP does not always do
the most sensible thing!

--
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[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
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PHP Debugging with Style -OR- How I Learned to Stop Worrying and Love the Bug
http://tobyinkster.co.uk/blog/2007/08/12/php-debugging-with-style/

On 12.08.2007 21:45 jmark.RemoveThis@fastermail.com wrote:
> I saw this example in php.net
>
> // Outputs: apearpearle pear
> $letters = array('a', 'p');
> $fruit = array('apple', 'pear');
> $text = 'a p';
> $output = str_replace($letters, $fruit, $text);
> echo $output;
>
> and I am bit puzzled why the output is the way it is instead of
>
> apple pear
>
> it looks like str_replace is replacing the p in apple to pear but why
> does not replace the p in pear to pear and the a to apple and why is
> the output not "apple pear"?
>

what you probably want is strtr

$repl = array('a' => 'apple', 'p' => 'pear');
$text = 'a p';
echo strtr($text, $repl);



--
gosha bine

makrell ~ http://www.tagarga.com/blok/makrell
php done right http://code.google.com/p/pihipi