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<?php $obj = (object) array('1' => 'foo'); var_dump(isset($obj->{'1'})); // PHP 7.2.0 后输出 'bool(true)'，之前版本会输出 'bool(false)' var_dump(key($obj)); // PHP 7.2.0 后输出 'string(1) "1"'，之前版本输出 'int(1)' ?>
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