PHP uses extra-long, large numbers to prevent numbers from being displayed in scientific notation scientific counting method practice scientific counting method conversion scientific counting method

In this paper, the method of using extra-long (extra-large) digital arithmetic to prevent the digital display by scientific counting method is described. Share to everyone for your reference, as follows:

PHP will make an error when calculating a large numeric operation, and when the number is too large, the value will be counted as scientific. So how do you do PHP super-large numeric operations, including subtraction, exponentiation, square root, modulo operations?

To solve the problem of scientific counting, just add a pair of quotes when assigning a value.

Such as:

<?php$n = ' 22222222222222222222222222220 '; echo $n;? >

If not quoted, display 2.2222222222222E+28, quote 22222222222222222222222222220

Extra-large numerical operations, including subtraction, power operations, square roots, modulo operations.

Use PHP's Bcmath function to create a custom function with the following code,

<?phpfunction Calc ($m, $n, $x) {  $errors =array (    ' dividend cannot be zero ',    ' negative numbers have no square root '  );  Switch ($x) {case    ' Add ':      $t =bcadd ($m, $n);      break;    Case ' Sub ':      $t =bcsub ($m, $n);      break;    Case ' Mul ':      $t =bcmul ($m, $n);      break;    Case ' div ':      if ($n!=0) {        $t =bcdiv ($m, $n);      } else{        return $errors [0];      }      break;    Case ' POW ':      $t =bcpow ($m, $n);      break;    Case ' mod ':      if ($n!=0) {        $t =bcmod ($m, $n);      } else{        return $errors [0];      }      break;    Case ' sqrt ':      if ($m >=0) {        $t =bcsqrt ($m);      } else{        return $errors [1];      }      break;  }  $t =preg_replace ("/\. *0+$/",", $t);  return $t;} /* Usage Example */echo calc (' 11111111111111111111111111111111110 ', ' ten ', ' Add ');? >

How to use:

Calc (parameter 1, parameter 2, parameter 3);
Parameter 3 Specifies the method of operation: Add, Sub minus, Mul, div except, pow power, mod modulo, sqrt to find the square root of arithmetic
Add and subtract: Parameter 1 plus/minus/multiply/divide by parameter 2
Power: Parameter 1 of the parameter 2 times Square.
Modulo: The remainder of the parameter 1 divided by the parameter 2.
Arithmetic square root: The arithmetic square root of parameter 1. Parameter 2 does not work, but cannot be omitted.

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I hope this article is helpful to you in PHP programming.

The above is introduced in PHP using extra-long large number of digital operations to prevent the number of scientific counting method, including the scientific counting method, the content of the digital operation, I hope that the PHP tutorial interested in a friend helpful.

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