bcsqrt
    (PHP 3, PHP 4, PHP 5)
bcsqrt -- 
     Get the square root of an arbitrary precision number
    
Description
string 
bcsqrt ( string operand [, int scale] )
     Return the square root of the operand.
     The optional scale parameter sets the
     number of digits after the decimal place in the result.
    
Examples
| Example 1. bcsqrt() example | 
<?php
 echo bcsqrt('2', 3); // 1.414
 
 ?>
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