gmp_perfect_square()

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

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.

可以是一个 GMP数据resouce，或一个可以转换为数值的字符串。

返回值

Returns TRUE if$ais a perfect square,FALSE otherwise.

范例

gmp_perfect_square() example

<?php
// 3 * 3, perfect square
var_dump(gmp_perfect_square("9"));
// not a perfect square
var_dump(gmp_perfect_square("7"));
// 1234567890 * 1234567890, perfect square
var_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