Usage:
assertThat("hello", matchesUsing(function($value) { return $value === "hello"; }));Creating new custom matchers is made simpler with the callback matcher.
You can use describedAs() to provide a better description for the expectation.
function myCustomMatcher()
{
return describedAs('a custom value', new CallbackMatcher(
function($value) {
return $value === 'my custom value';
}
)
}