The gmp_sub() is an in-built function in PHP which returns the subtraction of the two GMP numbers.(GNU Multiple Precision: For large numbers)
Syntax:
gmp_sub($num1, $num2)
Parameters: This function accepts two GMP numbers $num1 and $num2 as mandatory parameters shown in the above syntax. These parameters can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number.
Return Value: The function returns the subtraction of two numbers $num1 and $num2.
Examples:
Input : $num1=5 , $num2=10 Output : -5 Input : $num1=7 , $num2=1 Output : 6
Below programs illustrate the gmp_sub() function:
Program 1: The program below demonstrates the working of gmp_sub() function when GMP number are passed as arguments.
<?php // PHP program to subtract two // two numbers   // GMP number as arguments $num1 = gmp_init("101", 2); $num2 = gmp_init("1010", 2);   // 5-10 = -5 $sub = gmp_sub($num1, $num2);   // gmp_strval converts GMP number to string // representation in given base(default 10). echo gmp_strval($sub, 2); ?> |
Output:
-101
Program 2: The program below demonstrates the working of gmp_sub() when numeric string are passed as arguments.
<?php // PHP program to subtract two // two numbers   // numeric strings number as arguments $num1 = "7"; $num2 = "1";   // 7-1 = 6 $sub = gmp_sub($num1, $num2);   echo $sub; ?> |
Output:
6
