PHP7 中？？与？：的区别

??是PHP7版本的新特性，它与?:的区别在哪里呢
？？
$b = $a?? $c ;相当于$b= isset($a)?$a:$c;
?:
$b = $a?$a: $c 则是 $b = ！empty($a) ? $a:$c;

基本文件流程错误 SQL 调试

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PHP7 中 ？？ 与？ ：的区别

PHP7 中？？与？：的区别