Are the values of self-increasing and self-decreasing all 1?
Self-increment: $a++ is equivalent to $a+1
Self-decrement: $a-- is equivalent to $a-1
The value of each influence of self-increasing and self-decreasing is 1
$i++ //类似这样的代码，就是自加一
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Self-increment: $a++ is equivalent to $a+1
Self-decrement: $a-- is equivalent to $a-1
The value of each influence of self-increasing and self-decreasing is 1