Php/docs/function.gmp-sign

• PHP Manual
• GMP 函数
• Sign of number

gmp_sign

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_sign — Sign of number

说明

gmp_sign ( GMP $a ) : int

Checks the sign of a number.

参数

a

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to an int.

返回值

Returns 1 if a is positive, -1 if a is negative, and 0 if a is zero.

范例

Example #1 gmp_sign() example

<?php// positiveecho gmp_sign("500") . "\n";// negativeecho gmp_sign("-500") . "\n";// zeroecho gmp_sign("0") . "\n";?>

以上例程会输出：

1
-1
0

参见

• gmp_abs() - Absolute value
• abs() - 绝对值