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@ 2018-10-29T21:56:53Z

<?php

/* pseudo mysqli object */
class Foo
{
    public $error;
    
    public function __construct($host, $user, $passwd,  $dbname)
    {
        $this->host = $host;
        $this->user = $user;
        $this->pass = $passwd;
        $this->$dbname = $dbname;
    }
    
    public function query($sql, $resultmode)
    {
        if ($sql !== 'Valid Query') {
            $this->error = 'Expected "Valid Query"';
        }
        
        return new Bar;
    }
}

/** pseudo mysql_stmt object */
class Bar
{
    public function fetch_assoc()
    {
        echo 'I was successful';
    }
}



class Conn
{

    private $conn;
   
    public function __construct(...$args) 
    {
        $this->conn = new Foo(...$args);
    }
   
    public function query($query, $resultmode = 1) 
    {
       $d = $this->conn->query($query, $resultmode);
       if (!empty($this->conn->error)) {
           throw new \RuntimeException($this->conn->error);
       }

       return $d;
    }
}

//Your example
$con = 'my_var';
$$con = new Conn('host', 'user', 'pass', 'base');


//example usage of valid query
$q = $my_var->query('Valid Query');
$q->fetch_assoc();

echo PHP_EOL.  '-----' . PHP_EOL;

//example use of invalid query throwing an exception before `fetch_assoc`
$q = $my_var->query('This is not valid');
$q->fetch_assoc();

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Creation of dynamic property Foo::$host is deprecated in /in/PlZEs on line 10 Deprecated: Creation of dynamic property Foo::$user is deprecated in /in/PlZEs on line 11 Deprecated: Creation of dynamic property Foo::$pass is deprecated in /in/PlZEs on line 12 Deprecated: Creation of dynamic property Foo::$base is deprecated in /in/PlZEs on line 13 I was successful ----- Fatal error: Uncaught RuntimeException: Expected "Valid Query" in /in/PlZEs:51 Stack trace: #0 /in/PlZEs(70): Conn->query('This is not val...') #1 {main} thrown in /in/PlZEs on line 51
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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