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@ 2017-02-03T16:41:55Z

<?php

class Thing
{
    public function __call($name, $params)
    {
        return 'foo';
    }
}

function can_be_string($var) {
    return $var === null || is_scalar($var) || (is_object($var) && method_exists($var, '__toString'));
}

$a = new Thing;

var_dump(can_be_string($a));

(string) $a;

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
method_exists: documentation ( source)

preferences:dark modelive preview

47.91 ms | 405 KiB | 5 Q