PHP self-increment and decrement operation

Source: Internet
Author: User

PHP variables can hold any type of value. When you perform an auto-decrement operation on a variable, its values are of a wide range, not limited to numeric types. This feature is found in languages such as Perl, which are weakly typed. While the values of Java variables are strictly distinguished by the type of language, such operations are limited to numeric type values.

When a string has a value in each of the binary identifiers (0x, 0b, etc.), scientific notation (E), there will be exceptions, need to be noted.

The increment/decrement operator does not affect the Boolean value. Decreasing the null value also has no effect, but the result of incrementing null is 1.
When dealing with arithmetic operations of character variables, PHP inherits the Perl habit, not the C.
$a = TRUE;
Var_dump (+ + $a); BOOL (TRUE)

$a = TRUE;
Var_dump (-$a); BOOL (TRUE)

$b = FALSE;
Var_dump (+ + $b); BOOL (FALSE)

$b = FALSE;
Var_dump (-$b); BOOL (FALSE)

See: http://www.phpxs.com/post/4226

PHP self-increment and decrement operation

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: info-contact@alibabacloud.com 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.