Re: function by reference
| From: | Robert Cummings | Date: | Mon, 10 Apr 2006 16:25:14 +0000 |
| Subject: | Re: function by reference | ||
| References: | 1 2 3 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-233673@lists.php.net to get a copy of this message | ||
On Mon, 2006-04-10 at 09:42, tedd wrote:
> >It's the same thing for the most part...
> >
> ><?php
> >
> >$a = 'f_a';
> >call_user_func( $a, $p1, $p2, $p3 )
> >
> >?>
> >
> >Cheers,
> >Rob.
>
> Rob:
>
> No way dude -- that was too easy!
>
> Boy, am I in love with this language -- it gives you plenty of
> shovels to dig yourself in as deep as you want.
*lol*. personally I prefer the other format which was what I tried to
illustrate with my original example:
<?php
$a = 'f_a';
$a( $p1, $p2, $p3 );
?>
All it means, is that once you have the name of a function in a variable
you can invoke the variable as a function and it will invoke the
function matching the variable's value. Some of this stuff can be really
useful for doing backwards compatibility with older versions of PHP:
<?php
function my_slowass_ctype_alpha( $chars )
{
return eregi( '^[[:alpha:]]+$, $chars );
}
if( function_exists( 'ctype_alpha' ) )
{
$ctype_alpha = 'ctype_alpha';
}
else
{
$ctype_alpha = 'my_slowass_ctype_alpha';
}
if( $ctype_alpha( 'weeeeee' ) )
{
echo 'Alpha chars only!';
}
else
{
echo 'Not alpha chars only!';
}
?>
Cheers,
Rob.
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