ScotlandPHP 2019

bcdiv

(PHP 4, PHP 5, PHP 7)

bcdivDivide two arbitrary precision numbers

Description

bcdiv ( string `\$dividend` , string `\$divisor` [, int `\$scale` = 0 ] ) : string

Divides the `dividend` by the `divisor`.

Parameters

`dividend`

The dividend, as a string.

`divisor`

The divisor, as a string.

``` scale```

This optional parameter is used to set the number of digits after the decimal place in the result. If omitted, it will default to the scale set globally with the bcscale() function, or fallback to 0 if this has not been set.

Return Values

Returns the result of the division as a string, or `NULL` if `divisor` is 0.

Examples

Example #1 bcdiv() example

``` <?phpecho bcdiv('105', '6.55957', 3);  // 16.007?> ```

See Also

• bcmul() - Multiply two arbitrary precision numbers

add a note

User Contributed Notes 4 notes

Anonymous
8 years ago
``` The custom bcdiv function listed at the top of this page produces very different results from bcdiv, as it rounds instead of truncating the result. Consider the following:<?phpfunction bcdiv_cust( \$first, \$second, \$scale = 0 ){    \$res = \$first / \$second;    return round( \$res, \$scale );}echo bcdiv('1','2','0') . " vs. " bcdiv_cust('1','2','0');  // prints '0 vs. 1'?> ```
MM
11 years ago
``` Perhaps some one can find useful this function to compute the modular inverse of a integer (extended euclidean algorithm):  function invmod(\$a,\$b) {    \$n=\$b;    \$x=0; \$lx=1; \$y=1; \$ly=0;    while (\$b) {      \$t=\$b;      \$q=bcdiv(\$a,\$b,0);      \$b=bcmod(\$a,\$b);      \$a=\$t;      \$t=\$x; \$x=bcsub(\$lx,bcmod(bcmul(\$q,\$x),\$n)); \$lx=\$t;      \$t=\$y; \$y=bcsub(\$ly,bcmod(bcmul(\$q,\$y),\$n)); \$ly=\$t;    }    if (bccomp(\$lx,0) == -1)      \$lx=bcadd(\$lx,\$n);    return \$lx;  }  // verify  \$n="2447995268898324993537772139997802321";  \$t="64941057316178801556773346239351236811";  \$m="123456789";  \$i=invmod(\$t,\$n);  // (t*m)*inv(t) is m  echo bcmod(bcmul(bcmod(bcmul(\$t,\$m),\$n),\$i),\$n) == \$m; ```
Gautam
11 years ago
``` <?php //converting in to required precision of decimal points\$result= bcdiv(89.99999999997,2.57865741235478,2); echo "\$result";  // 34.90 result with 2 decimal points?> ```
-6
cristianDOTzuddas]NOSPAM[gmailDOTcom
13 years ago
``` Decimal to binary conversion, using BC Math.Note: this function is VERY slow if the decimal number is too big!<?function bc_decbin(\$dec_str) {    if (strlen(\$dec_str)>0) {        \$bin_str = '';        do {            if (((int)\$dec_str[strlen(\$dec_str)-1] % 2) === 0)                \$bin_str .= '0';            else                \$bin_str .= '1';                        \$dec_str = bcdiv(\$dec_str, '2');        } while (\$dec_str!='0');                return strrev(\$bin_str);    }    else        return null;}?>-----Cristianwww.CodeFlower.com ```