


How to implement self-increment and self-decrement of PHP Boolean values
This article mainly introduces the implementation method of self-increasing and self-decreasing PHP Boolean values. It has a certain reference value. Now I share it with you. Friends in need can refer to it.
In the morning and After the business requirements battle was over, I was about to open the group to see if any experienced drivers had checked out the car. Suddenly I saw some messages from @E五九天II
He discovered that PHP The Boolean value of , no matter how many times it is incremented, the final output is 1
This is more interesting~
Self-increment and self-decrement, what is the difference between $a and $a We all know that
a means to take the address of a, increase the value of a in the memory, and then put the value in the register
a means to take the address of a, load the value of a into the register, and then add The value of a in the memory
I opened an editor to confirm the result
$a = true; var_dump(--$a); echo PHP_EOL; echo $a; $b = false; echo PHP_EOL; var_dump(++$b);
The final input result of the operation is as follows
bool(true)
1
bool(false)
I found that the result was not quite what I expected. PHP did not do anything for the auto-increment operation of Boolean values. Processing, and the reason why it is 1 after incrementing is because we use echo to output, resulting in the bool being forced to
to query the official documentation of PHP, but unexpectedly there is a line of obvious prompts
Note : Increment/decrement operators do not affect boolean values. Decrementing a NULL value has no effect, but increasing NULL results in 1.
Related recommendations:
Android programmers learn PHP development (5)-Boolean scientific notation-PhpStorm
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