string -> pass arguments to object

[jjshell]

Hi,

I have a string as followed:

$a = '4,8'; 

"4" is an argument, "8" is another argument, both to be passed to an object whose constructor expects two arguments.

$obj = new Obj($a); 

How can I achieve this at instantiation level? The object thinks there is one argument "4,8".

There is one no-no: I don't want to touch the class using the two arguments.


Regards,

-jj.

[kyberfabrikken]

Why would you need this?

[guido2004]

list($a1, $a2) = explode(',', $a);
$obj = new Obj($a1, $a2);

[AnthonySterling]

Hmm perplexing, an exam question?

What about this?

<?php
eval("\$obj = new Obj({$a});")
?>

SilverB.

[Jake Arkinstall]

You could use:

<?php
class Obj{
    protected $a, $b;
    function __Construct($a, $b = null){
        if($b == null){
            $arr = explode(',', $a);
            $a = trim($arr[0]);
            $b = trim($arr[1]);
        }
        $this->a = $a;
        $this->b = $b;
    }
}

//all have the same effect:
$obj = new Obj('4,8');
$obj = new Obj(' 4 , 8 ');
$obj = new Obj(4, 8); 

[Jake Arkinstall]

eval

A shadow has been cast over this thread!

[AnthonySterling]

*giggles mischievously*

Would it work though? I haven't tested...does that count as two shadow i wonder!

SilverB.

[Jake Arkinstall]

Yep, it would work.

However I really wouldn't recommend using it, for speed and security reasons.

[AnthonySterling]

Yay! Sussed it.

<?php

class breakfast
{
    public $sText;
    
    public function __construct( $firstItem , $secondItem )
    {
        $this->sText = "I'll order {$firstItem} omelette with {$secondItem} please!";
    }
}

$sParams = 'cheese,bacon';

eval("\$oBreakfast = new breakfast({$sParams});");

echo $oBreakfast->sText;

?>

However I really wouldn't recommend using it, for speed and security reasons.

I completely agree, but I do love challenges!

SilverB.

[logic_earth]

eval nah no need for that.

$args = 'a,b'; $args = explode( ',', $args );

$o = new ReflectionClass( 'Obj' );
$r = $o->newInstanceArgs( $args );

var_dump( $r ); 

I love playing with the Reflection API <3

[Salathe]

$a = '4,8';

$ref = new ReflectionClass('Obj');
$obj = $ref->newInstanceArgs(explode(',', $a)); 

edit: logic_earth beat me to it

[AnthonySterling]

I love playing with the Reflection API <3

Geek!

[logic_earth]

Geek!

I'll accept that label with pride!

[jjshell]

eval nah no need for that.

$args = 'a,b'; $args = explode( ',', $args );

$o = new ReflectionClass( 'Obj' );
$r = $o->newInstanceArgs( $args );

var_dump( $r ); 

I love playing with the Reflection API <3

I knew you would come up with something amazing like this!