A complete collection of PHP self-increment and self-subtraction operation examples

PHP doesn’t have many arithmetic symbols, but not all of them do you know how to use? Here let’s talk about the upgraded version of PHP’s arithmetic symbols: ++, --, haha.

++　That is, self-increasing,

--　That is, self-decreasing.

Practical application:

<?php
    $a = 10; $a++ = ?　　//先用再加，最后结果为11
    $a = 10; ++$a = ?　　//先加再用，最后结果为11
     
    $a = 10;
    $b = $a++ + ++$a;
    echo $a;
    echo $b;　　 //算一下吧，结果我回复解答
?>

<?php
    //求模运算符
    //1.php中对小数求模无意义，会自动转换成整数来求模；
    echo 23.5345%3.2343;
    echo "<br>";//输出结果2
    //2.php中求模的结果正负由被除数来决定；
    echo -34%4;
    echo "<br>";//输出-2
    echo 98%-4;
    echo "<br>";//输出2
    //3.求模用到的地方：一是让一个数不超过一个值（除数），二是取能被什么数整除的值；
    //++和--运算符
    //$a++和$a--都是先用再加/减，++$a和--$a都是先加/减再用；
    $a=3;
    $b=$a++;
    echo $a,&#39; &#39;,$b."<br>";//输出变量a等于4，变量b等于3
    $a=3;
    $b=--$a;
    echo $a,&#39;&nbsp&#39;,$b."<br>";//输出2 2
    $a=5;
    $b=$a++ + ++$a;
    echo $a,&#39;&nbsp&#39;,$b."<br>";//输出7 12
    $a=5;
    $b=$a-- - --$a;
    echo $a,&#39;&nbsp&#39;,$b."<br>";//输出3 2
?>

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