PHP 7.2 suppress warning from count

suppress-warning-from-count-on-non-countable.php

<?php

/**
 * This is an alternative way of handling warnings from calling count() on
 * non-countables. It's just an error handler that drops the warning, and calls
 * the previous error handler for everything else (if there is one).
 */

$previous = set_error_handler(function ($errno, $errstr, $errfile, $errline, $errcontext) use (&$previous) {
    // Do nothing with an E_WARNING from count.
    if ($errstr == 'count(): Parameter must be an array or an object that implements Countable') {
        return;
    }

    // If another error handler was defined, call it.
    if ($previous) {
        return $previous($errno, $errstr, $errfile, $errline, $errcontext);
    } else {
        // Use the default error handler.
        return false;
    }
}, E_WARNING);

See: https://gist.github.com/ameenross/e7f4dea8468d178464ca2f221ede72c0 for some more context.
Make sure this error handler is the last one to be added. Put your code in a place so that it is run after other set_error_handler calls.

In Symfony 2.x, a suitable place would be AppKernel::registerContainerConfiguration;