PHP - Converting a regular function to inline anonymous function

Question

This is my function:

function rp_md5 ($string)
{
    return md5(strrev($string) . $string);
}

I wish to convert it to a inline anonymous function and I have already tried this code:

$foo = $_POST['u_pwd'];
$pwd = function() use($foo) { 
                return md5(strrev($foo) . $foo);
     };

How I can store new password in the variable $pwd? normally I must call it:

echo $pwd($foo);

sorry for my bad explanation.

What's the point of the use? Why not simply $pwd=function($foo) {return md5(strrev($foo) . $foo);}; — Mark Baker
– Mark Baker, Commented Jan 10, 2014 at 9:51
You can't store the password created by the function $pwd in the variable $pwd if your function is already called $pwd without losing that function definition — Mark Baker
– Mark Baker, Commented Jan 10, 2014 at 10:15

Ivan Yonkov · Accepted Answer · 2014-01-10 09:55:46Z

3

The problem you might expect is that you are trying directly to print $pwd as a variable, instead as a function. This way $pwd will be object of class Closure and cannot be converted to string. You should CALL it.

In your example it will be:

$foo='adasdsadasd';
$pwd=function() use($foo) {return md5(strrev($foo) . $foo);};
echo $pwd();

returning

c22ddae767082a65351481607d0974b7

but with use($foo) you expect $foo to be a global variable, your function is barely reusable.

Using:

$foo='adasdsadasd';
$pwd=function($foo) {return md5(strrev($foo) . $foo);};

will give you the opportunity to call $pwd() with parameters, so you can use it everytime with different param.

In this case you are using:

echo $pwd($foo);

To achieve the same output:

c22ddae767082a65351481607d0974b7

answered Jan 10, 2014 at 9:55

Ivan Yonkov

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4 Comments

progfa Over a year ago

please recheck my question

Ivan Yonkov Over a year ago

@progfa You must call it $pwd() (if there is use($foo)) or $pwd($foo). What do you need? One more assignation? $foo='adasdsadasd'; $pwd=function($foo) {return md5(strrev($foo) . $foo);}; $pwd1 = $pwd($foo); echo $pwd1;

progfa Over a year ago

I want to do it without calling $pwd($foo) and new password must be store in the same variable($pwd), it is not possible?

Ivan Yonkov Over a year ago

@progfa If you don't want to CALL why do you use a CALLABLE then? $pwd = md5(strrev($foo) . $foo) is pretty much straightforward for the concept you want to achieve. Otherwise it's not possible to get return value of function (whether closure or not) without calling it

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