Return-1 What does this mean? & Lt ;? Php & nbsp; functionmyfunction ($ v1, $ v2) {if ($ v1 ===$ v2) {return0; & nbsp ;} if ($ v1 & gt; $ v2) {return1 return-1 What does this mean?
Function myfunction ($ v1, $ v2) {if ($ v1 ===$ v2) {return 0;
} If ($ v1> $ v2) {return 1;
} Else {return-1;
}}$ A1 = array (0 => "Dog", 1 => "Cat", 2 => "Horse ");
$ A2 = array (3 => "Dog", 1 => "Cat", 5 => "Horse ");
Print_r (array_diff_uassoc ($ a1, $ a2, "myfunction "));
?>
The running result is as follows: Array ([0] => Dog [2] => Horse)
Returns 0, 1, and-1. I just don't understand this. I have always understood 0 and 1 as true and false. what about-1?
What is the function of return-1? Please take a look. thank you.
------ Solution --------------------
The returned value. In that function,-1 is another condition.
------ Solution --------------------
Input parameter $ v1, $ v2
1 indicates that $ v1 is greater than $ v2
-1 indicates that $ v1 is less than $ v2
0 indicates that $ v1 is equal to $ v2
------ Solution --------------------
Discussion
Input parameter $ v1, $ v2
1 indicates that $ v1 is greater than $ v2
-1 indicates that $ v1 is less than $ v2
0 indicates that $ v1 is equal to $ v2
------ Solution --------------------
User-defined function, compare index value... This is usually the case.
1, 0, and-1 indicate greater than, equal to, and less
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.