In those years, the PHP self-increment and self-subtraction operations we have pursued (2)_PHP Tutorial

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Let’s start with an example to highlight the key points.

$a = true;

echo $a++;

echo $a + 1;

$b = 'c';

echo $b++;

echo $b++;

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Do you know the correct answers to the above four outputs? Here are some summarized rules. You can also experiment by yourself.

1. The Boolean type does not participate in the ++ operation, does not perform type conversion and participates in auto-increment. So the first output is 1.

2. Boolean types involved in arithmetic operations such as +, - will automatically perform type conversion, so the second output is 2.

3. The string ++ in PHP represents ascending order, so the third output is c and the fourth output is d.

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