A sample introduction to the increment and decrement of PHP strings

Source: Internet
Author: User

This article mainly introduces the increment and decrement of string in PHP, need friends can refer to the following

Here's a quote from the PHP manual today: "When dealing with the arithmetic of character variables, PHP follows the custom of Perl, not C." For example, in Perl $a = ' Z '; $a + +; will turn $a into ' AA ', and in C, a = ' Z '; a++; The ASCII value of a ' [' (' Z '] is 90, and the ASCII value of ' [' is 91]. Note that character variables can only be incremented, cannot be decremented, and only plain letters (A-Z and A-Z) are supported. Increment/decrement of other character variables is invalid, the original string does not change. "That is to say: The code is as follows: for ($i = ' A '; $i <= ' Z ';  $i + +) {echo $i;  if ($i = = ' ZZZ ') Die ();    The result is: Abcdefghijklmnopqrstuvwxyzaaabacadaeafagahaiajakalamanaoapaqarasataua ......  There are also string variables that cannot be decremented: The code is as follows: $a = ' Z ';  --$a; echo $a;  Z This also illustrates that the $a++ or + + $a cannot be $a = $a + 1; To interpret the code as follows: $a = $b = ' Z ';  $a = $a + 1; echo $a;  1 + + $b; Echo $b; Aa
Related Article

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

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.