PHP && Logic and operator usage instructions

Source: Internet
Author: User

The following foo () is not called because they are "shorted" by the operator.

$a = (false && foo ());

$b = (true | | foo ());

$c = (False and foo ());

$d = (true or foo ());

"| |" has a higher priority than "or"

$e = False | | True $e is assigned a value of (false | | true), and the result is true

$f = False or true; $f is assigned false [Altair NOTE: ' = ' has a higher precedence than ' or ']

Var_dump ($e, $f);

"&&" has a higher priority than "and"

$g = True && false; $g is assigned (true && false) and the result is false

$h = True and false; $h is assigned true [Altair Note: ' = ' has a higher precedence than ' and ']

Var_dump ($g, $h);


The use of the operator is a feature that can be reduced by using the IF

  • Related Article

    Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.