php calling an anonymous function

Question

I have an anonymous function:

$rules = array(
    'asdf' => array('required'),
    'zxcv' => array('function ($data) {
    return strtoupper($data); }'),
);

found in the the 'zxcv' key of the $rules array. I need to call this function and I've already tried a few things including:

$rules['zxcv']('mydata');

and

array_map($rules['zxcv'], 'mydata');

and

call_user_func($rules['zxcv'], 'mydata'); to no avail

any help would be appreciated

the reason why you're not able to call it is simply because it's not actually a function. What you have there is a string. Not a function. — Tularis
– Tularis, Commented Mar 26, 2014 at 18:51
You can either eval() it (not recommended) or make it a normal function (drop the quotes). — Shomz
– Shomz, Commented Mar 26, 2014 at 18:53

Amal · Accepted Answer · 2014-03-26 18:52:43Z

4

That's a string, not a function. Lose the quotes and make it like so:

$rules = array(
   'asdf' => array('required'),
   'zxcv' => function($data) { return strtoupper($data); }
);

Usage with array_map():

array_map($rules['zxcv'], $someArray);

Calling the function individually:

echo $rules['zxcv']('foo'); // FOO

Demo

answered Mar 26, 2014 at 18:52

Amal

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6 Comments

user3207727 Over a year ago

is it really that simple?

Clive Over a year ago

@user3207727 Try it and see ;)

Tularis Over a year ago

yes, it is that simple. You made it a string... and a string is not evaluated to actual PHP code.

Amal Over a year ago

@user3207727: Yes, really. It's that simple :)

user3207727 Over a year ago

it's working, I'm using $rules['zxcv']('foo') and its fine, thanks again, but one thing, who should I upvote? I'm not real familiar with how this forum thing works

|

Tularis · Accepted Answer · 2014-03-26 18:53:46Z

3

What you have there is a string, not a function.

What you're looking for is:

$rules = array(
   'asdf' => array('required'),
   'zxcv' => function($data) { return strtoupper($data);}
);

and you can then call it like this:

$rules['zxcv'](YOUR_DATA);
array_map($rules['zxcv'], YOUR_DATA);

answered Mar 26, 2014 at 18:53

Tularis

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