Php/docs/function.gmp-perfect-square

• PHP Manual
• GMP 函数
• Perfect square check

gmp_perfect_square

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

gmp_perfect_square — Perfect square check

说明

gmp_perfect_square ( GMP $a ) : bool

Check if a number is a perfect square.

参数

a

The number being checked as a perfect square.

PHP 5.5 之前为 GMP 数值资源，PHP 5.6 之后为 GMP 对象或数字，或可以转为数字的字符串。

返回值

Returns true if a is a perfect square, false otherwise.

范例

Example #1 gmp_perfect_square() example

<?php// 3 * 3, perfect squarevar_dump(gmp_perfect_square("9"));// not a perfect squarevar_dump(gmp_perfect_square("7"));// 1234567890 * 1234567890, perfect squarevar_dump(gmp_perfect_square("1524157875019052100"));?>

以上例程会输出：

bool(true)
bool(false)
bool(true)

参见

• gmp_perfect_power() - Perfect power check
• gmp_sqrt() - Calculate square root
• gmp_sqrtrem() - Square root with remainder