Argument of native function untouchable?? 1

[Sleidia]

Hi guys,

All my attempts to dynamically call STR_PAD_BOTH failed as you can see below.

Only the last version, the untouched one, works.

So, is it really impossible???

$string = "BOTH";

echo str_pad("some text", 25, "-", STR_PAD_{$string}) . "<br />";
// returns Parse error: parse error, unexpected '{'

echo str_pad("some text", 25, "-", STR_PAD_ . $string) . "<br />";
// returns ----------------some text

echo str_pad("some text", 25, "-", "STR_PAD_" . $string) . "<br />";
// returns ----------------some text

$string = "STR_PAD_BOTH";

echo str_pad("some text", 25, "-", $string) . "<br />";
// returns ----------------some text

echo str_pad("some text", 25, "-", STR_PAD_BOTH) . "<br />";
// returns --------some text-------- ( expected result )

 

[Sleidia]

I've tried that too :

$string = "BOTH";
echo eval("str_pad('some text', 25, '-', STR_PAD_" . $string . ");");
// returns nothing

 

[vacunita]

That's because that paramter of stre_pad has to be an integer. In reality what you are passing to the funtion is the name of a constant that contains an integer.

So you can dop to things.

either pass the number 2 for "BOTH"

or do what you are doing using the constant() function to evaluate your string:

echo str_pad("some text", 25, "-", [red]contant("[/red]STR_PAD_[red]"[/red] . $string[red])[/red]) . "<br />";

----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.

 

[Sleidia]

Thank you soooo much Vac

Works like a charm.
I had already heard of the constant() function before but I was too dumb to remember it for this particular case

Anyway, thanks again!

 

[vacunita]

You're welcome, glad I could help.



----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.