(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_perfect_square — Perfect square check
Returns true if num is a perfect square,
false otherwise.
示例 #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"));
?>以上示例会输出：
bool(true) bool(false) bool(true)