The gmp_cmp() is an inbuilt function in PHP which is used to compare two GMP numbers(GNU Multiple Precision : For large numbers).
Syntax:
gmp_cmp($num1, $num2)
Parameters: This function accepts two GMP numbers $num1 and $num2 as mandatory parameters as shown in the above syntax for comparing. These parameters can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass numeric strings such that it is possible to convert those strings in numbers.
Return Value: The function returns “1” if $num1 > $num2, “0” if $num1 equal to $num2, “-1” if $num1 < $num2.
Examples:
Input : gmp_cmp("1234", "1236")
Output : -1
Input : gmp_cmp("3569", "3569")
Output : 0
Below programs illustrate the gmp_cmp() function in PHP:
Program 1: Program to compare the two GMP numbers when they are passed as numeric strings.
<?php // PHP program to compare two // GMP numbers passed as arguments // strings as GMP numbers $num1 = "12356"; $num2 = "12356"; // compares the two numbers and // gives the result "0" as both are equal $res = gmp_cmp($num1, $num2); echo $res; ?> |
Output:
0
Program 2: Program to compare two GMP numbers when they are passed as GMP numbers as arguments.
<?php // PHP program to compare two // GMP numbers passed as arguments // creating GMP numbers using gmp_init() $num1 = gmp_init(12355); $num2 = gmp_init(12356); // compares these two numbers and // gives the result "-1" as $num1 < $num2 $res = gmp_cmp($num1, $num2); echo $res; ?> |
Output:
-1
