In PHP 7.2, an exception is thrown if the column name is a string instead of an array when building an IN condition.

[vistart]

What steps will reproduce the problem?

As of PHP 7.2, count() only receives an array or a class that implements Countable, and throws an exception when it encounters another type.
We look at line 1186 (2.0.10) or line 1188 (master), if $column is a string at this time, then an exception will be thrown.
As we all know, in future versions of PHP, parameter type restrictions will become more stringent.

My Solution:

Check whether the $column is an array before counting it.
for example:

if ($column instanceof \Traversable || (is_array($column) && count($column) > 1)) {
    return $this->buildCompositeInCondition($operator, $column, $values, $params);
} elseif (is_array($column)) {
    $column = reset($column);
}

Additional info

Q	A
Yii version	2.0.10 & 2.0.11-dev
PHP version	7.2.0-dev
Operating system	Any

[samdark]

Which class are you referring to?

[vistart]

@samdark Updated.
QueryBuilder.php

[vistart]

like this job:
the reason for the 3), 4), 7) ~ 20), 22) ~ 29) etc. are same as above,

[cebe]

Yeah, this is known issue, many tests are failing on PHP 7.2 because of count not supporting non-arrays anymore: https://travis-ci.org/yiisoft/yii2/jobs/192891263#L305

[vistart]

The same problem also occurs in yii2-redis:
LuaScriptBuilder.php

[SilverFire]

Fixed by 03d53b7