public function test_seems_utf8()
{
// Test a valid UTF-8 sequence: "ÜTF-8 Fµñ".
$validUTF8 = "ÜTF-8 Fµñ";
$this->assertTrue(util::seems_utf8($validUTF8));
$this->assertTrue(util::seems_utf8("� this has �� some invalid utf8 �"));
// Test invalid UTF-8 sequences
$invalidUTF8 = "� this has � some invalid utf8 �";
$this->assertFalse(util::seems_utf8($invalidUTF8));
// And test some plain ASCII
$this->assertTrue(util::seems_utf8('The quick brown fox jumps over the lazy dog'));
// Test an invalid non-UTF-8 string.
if (function_exists('mb_convert_encoding')) {
mb_internal_encoding('UTF-8');
// Converts the 'ç' UTF-8 character to UCS-2LE
$utf8Char = pack('n', 50087);
$ucsChar = mb_convert_encoding($utf8Char, 'UCS-2LE', 'UTF-8');
// Ensure that PHP's internal encoding system isn't malconfigured.
$this->assertEquals($utf8Char, 'ç', 'This PHP system\'s internal character set is not properly set as UTF-8.');
$this->assertEquals($utf8Char, pack('n', 50087), 'Something is wrong with your ICU unicode library.');
// Test for not UTF-8.
$this->assertFalse(util::seems_utf8($ucsChar));
// Test the worker method.
$method = self::getMethod('seemsUtf8Regex');
$this->assertFalse($method->invoke(null, $invalidUTF8), 'utilphp\\util::seemsUtf8Regex did not properly detect invalid UTF-8.');
$this->assertTrue($method->invoke(null, $validUTF8), 'utilphp\\util::seemsUtf8Regex did not properly detect valid UTF-8.');
}
}