PHP: sqrt - Manual (original) (raw)

(PHP 4, PHP 5, PHP 7, PHP 8)

sqrt — Square root

Description

Returns the square root of num.

Parameters

num

The argument to process

Return Values

The square root of num or the special value [NAN](math.constants.php#constant.nan) for negative numbers.

Examples

Example #1 sqrt() example

<?php // Precision depends on your precision directive echo sqrt(9), PHP_EOL; // 3 echo sqrt(10), PHP_EOL; // 3.16227766 ... ?>

See Also

• pow() - Exponential expression
• [M_SQRTPI](math.constants.php#constant.m-sqrtpi) - sqrt(pi)
• [M_2_SQRTPI](math.constants.php#constant.m-2-sqrtpi) - 2/sqrt(pi)
• [M_SQRT2](math.constants.php#constant.m-sqrt2) - sqrt(2)
• [M_SQRT3](math.constants.php#constant.m-sqrt3) - sqrt(3)
• [M_SQRT1_2](math.constants.php#constant.m-sqrt1-2) - 1/sqrt(2)

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