gmp_perfect_square

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

gmp_perfect_square — Perfect square check

说明

bool gmp_perfect_square ( GMP $a )

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 a is a perfect square, FALSE otherwise.

范例

Example #1 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_sqrt() - Calculate square root
gmp_sqrtrem() - Square root with remainder