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以下哪个符号对应于逻辑OR运算符？注意 | 和 || 的区别
|
||
^
&&
在空格中输入恰当的值，使最终打印的$a为10，$b为18；
<?php $a =
; $b =
; $a += 2; --$b; echo $a; echo $b;
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