About the mystery of self-increment and self-decrement operations in PHP_PHP Tutorial

About the secrets of self-increment and self-decrement operations in PHP

First look at an interview question:

    $a = 1;
    $b = &$a;

    if ($b == $a++)
        echo "true";
    else
        echo "false";

First, a variable $a is created and the value is set to 1;

Then, a variable $b is created and used as a reference to $a;

The last judgment statement contains two opcodes: POST_INC and IS_EQUAL. The first thing to execute is the return first and then increment statement (POST_INC), which returns 1 first, and then $a increments to 2, because $b is a reference to $a, and $b is also 2. Then the comparison statement (IS_EQUAL) is executed, because the value of $b is 2 and the return value of $a++ is 1, so they are not equal.

Similar interview questions include:

    $a = 1;
    $b = &$a;

    $b = $a++;
    
    echo "a: $a; b: $b";

http://www.bkjia.com/PHPjc/892832.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/892832.htmlTechArticleAbout the mystery of self-increment and self-decrement operations in PHP, first look at an interview question: $a = 1; $ b = $a; if ($b == $a++) echo "true"; else echo "false"; First, a variable $a is created and...