php class and method from array not able to call

Question

I have an array $run that hold $run[0] - class name and $run[1] - class method to run and i want to be able to do this :

// this is working ok
$class = new $run[0]();
// this is error
$class->$run[1]();

What is the best and most elegant way of doing this ?

Thanks

Possible duplicate of: http://stackoverflow.com/questions/4769148/accessing-an-associative-array-by-integer-index-in-php — Dan H, Apr 20 '16 at 09:18

score 1 · Accepted Answer · answered Apr 20 '16 at 09:20

1

Add {} around $run[1]: This uses an anonymous class which is available since PHP >= 7.0

<?php
$run = [];
$run[0] = new Class {

    public function myMethod(){
        return 'Hello world';   
    }

};
$run[1] = 'myMethod';


$class = new $run[0]();
echo $class->{$run[1]}(); //Returns Hello world

answered Apr 20 '16 at 09:20

Daan

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@123onetwothree Yes it will work. The thing that won't work is how I created the anonymous class in `$run[0]` – Daan Apr 20 '16 at 09:23
and if i have an array with parameters how can i pass that array to the function ? can i use `call_user_func_array()` ? – 123onetwothree Apr 20 '16 at 09:24
@SagarGuhe What do you mean _this might not work in PHP7_ ? The only version in which above code will work is PHP 7. – Daan Apr 20 '16 at 09:25
@123onetwothree I would use the splat operator. – Daan Apr 20 '16 at 09:27
splat operator ? how – 123onetwothree Apr 20 '16 at 09:30
@123onetwothree Please google it or ask in a different question. It's out of scope in this question. – Daan Apr 20 '16 at 09:30
You have an array with parameters you want to pass in the function. That's exactly what the splat operator helps you with. Either describe better what you want or use the splat operator. – Daan Apr 20 '16 at 09:33
@Daan see here http://php.net/manual/en/migration70.incompatible.php search for this term `Old and new evaluation of indirect expressions` – Sagar Guhe Apr 20 '16 at 09:36
@SagarGuhe Okay what exactly do I have to read? Above code works in PHP 7 test it yourself. – Daan Apr 20 '16 at 09:37
@Daan you found? I have modified my previous comment. – Sagar Guhe Apr 20 '16 at 09:40
@SagarGuhe Those are named keys, I'm using numeric keys. – Daan Apr 20 '16 at 09:42
actually it works like this `call_user_func_array(array($run[0], $run[1]), $params)` – 123onetwothree Apr 20 '16 at 09:44

php class and method from array not able to call

1 Answers1