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(PHP 4, PHP 5, PHP 7, PHP 8)
sqrt — Square root
numThe argument to process
The square root of num
or the special value NAN for negative numbers.
Приклад #1 sqrt() example
<?php
// Precision depends on your precision directive
echo sqrt(9), PHP_EOL; // 3
echo sqrt(10), PHP_EOL; // 3.16227766 ...
?>