How to call directly a returned anonymous function in php

Question

I'm trying to call directly a returned function and passing an argument, but it seems I have to do it in two times.

This is my code:

<?php
    $signup_db = $configOptions['db']['signup_db'];

    // setup the infos of the db connection in an object
    $dbInfos = new DBInfos();
    $dbInfos->setEngine( $signup_db['engine'] );
    $dbInfos->setHost( $signup_db['host'] );
    $dbInfos->setDbName( $signup_db['dbname'] );
    $dbInfos->setUser( $signup_db['user'] );
    $dbInfos->setPassword( $signup_db['password'] );

    // create the Inversion of Control object for dependency injection.
    $ioc = new IOC();

    // create a new database connection with a PDO object.
    $ioc->dbh = function($dbInfos) {
        try {
            PDOconfig::setDbInfos($dbInfos);
            $dbh = new PDOconfig();
            $dbh->setAttribute(PDO::ATTR_PERSISTENT, true);
            $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        } catch (Exception $e) {
            echo "Error!: " . $e->getMessage() . "<br/>";
        }
        return $dbh;
    };

    $dbh = $ioc->dbh;
    $dbh = $dbh($dbInfos);

    // default page if empty.
    if (empty($_GET)) {
        $_GET["page"] = "home";
    }
    if (isset($_GET["page"])) {
        $page = $_GET["page"];
        $variables = array("page" => $page, 
                           "ioc" => $ioc);

        if ($page == "home") {
            renderLayoutWithContentFile("home.php", $variables);            
        } else if ($page == "contact") {
            renderLayoutWithContentFile("contact.php", $variables);
        } else if ($page == "about") {
            renderLayoutWithContentFile("about.php", $variables);
        }
    }  
?>

This is IOC class:

<?php

// Inversion of control with magic methods
// its pupose is to serve as a container for dependency injection
class IOC {
    private $registry = array();

    public function __set($name, $resolver) {
        $this->registry[$name] = $resolver;
    }

    public function __get($name) {
        return $this->registry[$name];
    }
}

?>

I would like to transform this:

$dbh = $ioc->dbh;
$dbh = $dbh($dbInfos);

by this unique line of code:

$dbh = $ioc->dbh($dbInfos);

But I have an error if I do that:

Fatal error: Call to undefined method IOC::dbh() in domain.com/public/index.php on line 34

That doesn't make sense to me. Does someone know how to deal with this ?

(PHP regularly doesn't makes sense. It's simply badly implemented. It's the same with creating and object and calling a method on it in the same line) Can you please narrow your example so that everybody can reproduce it. — idmean, Sep 06 '14 at 21:02
Which PHP version are you using? I think it's possible since 5.5. — Charlotte Dunois, Sep 06 '14 at 21:23
Have a look at call_user_func_array function. It might help. — Petr Jirouš, Sep 06 '14 at 21:24

Coder anonymous · Accepted Answer · 2014-09-06T21:21:30.697

0

What these lines are doing:

$dbh = $ioc->dbh;
$dbh = $dbh($dbInfos);

is $dbh is assigned to a function and then you are passing $dbInfos to it. While what you are trying to do is calling a function dbh with parameters $dbInfos of the class IOC which actually doesn't exist. See the difference here..which is why you are getting the undefined call error.

If you really want to do that, try creating a function in IOC class and then proceed with what you are doing i.e $dbh = $ioc->dbh($dbInfos);..

I hope this helps..

edited Sep 06 '14 at 21:21

answered Sep 06 '14 at 21:08

Coder anonymous

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It definitely helps! Indeed, what actually doesn't make sense is what I am trying to do. The magic function __get() works with a class instance, not with a function. – Florian G Sep 06 '14 at 21:51

How to call directly a returned anonymous function in php

1 Answers1