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  • References
  • PHP
  • Function
  • Mathematics
  • Math

sqrt

(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() -

Links:
  • http://php.net/manual/en/function.sqrt.php
doc_php
doc_php
2025-01-10 15:47:30
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