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