(PHP 4, PHP 5, PHP 7)
Square root
float sqrt ( float $arg )
Returns the square root of arg.
Parameters:
arg
The argument to process
Returns:
The square root of arg or the special value NAN for negative numbers.
Examples:
sqrt() example
<?php // Precision depends on your precision directive echo sqrt(9); // 3 echo sqrt(10); // 3.16227766 ... ?>
See also:
pow() -
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