# intdiv

(PHP 7)

intdiv对除法结果取整

### 说明

intdiv ( int \$dividend , int \$divisor ) : int

dividend

divisor

### 返回值

dividend 除以 divisor 的商，对该商取整。

### 范例

Example #1 intdiv() 的一些例子

<?php
var_dump
(intdiv(32));
var_dump(intdiv(-32));
var_dump(intdiv(3, -2));
var_dump(intdiv(-3, -2));
var_dump(intdiv(PHP_INT_MAXPHP_INT_MAX));
var_dump(intdiv(PHP_INT_MINPHP_INT_MIN));
var_dump(intdiv(PHP_INT_MIN, -1));
var_dump(intdiv(10));
?>
int(1)
int(-1)
int(-1)
int(1)
int(1)
int(1)

Fatal error: Uncaught ArithmeticError: Division of PHP_INT_MIN by -1 is not an integer in %s on line 8
Fatal error: Uncaught DivisionByZeroError: Division by zero in %s on line 9

### User Contributed Notes 4 notes

27
AmeenRoss
3 years ago
This does indeed seem to be equal to intdiv:

<?php
function intdiv_1(\$a, \$b){
return (
\$a - \$a % \$b) / \$b;
}
?>

However, this isn't:

<?php
function intdiv_2(\$a, \$b){
return
floor(\$a / \$b);
}
?>

Consider an example where either of the parameters is negative:
<?php
\$param1
= -10;
\$param2 = 3;
print_r([

'modulus' => intdiv_1(\$param1, \$param2),

'floor' => intdiv_2(\$param1, \$param2),
]);

/**
* Array
* (
*     [modulus] => -3
*     [floor] => -4
* )
*/
?>
-8
Ts.Saltan
3 years ago
\$a = 57;
\$b = 3;

var_dump(
intdiv(\$a,\$b),
intdiv_1(\$a,\$b),
intdiv_2(\$a,\$b)
);

function intdiv_1(\$a, \$b){
return (\$a-\$a%\$b)/\$b;
}

function intdiv_2(\$a, \$b){
return floor(\$a/\$b);
}
//intdiv(\$a, \$b) == floor(\$a/\$b) == (\$a-\$a%\$b)/\$b
-10
polettog at gmail dot com
3 years ago
Without intdiv(), the following may be a good way (with \$a and \$b of type integer and not too big) :
<?php
(int)(\$a / \$b)
?>
because in case of divisible integers, the result will be integer and there is no risk of float appearing round but below their represented value (like the case (0.1+0.7)*10).
\$a and \$b really needs to be of type integer though.
If they are too big and indivisible, some precision will be lost during the conversion to float and the result may be inaccurate.
-12
Bubonic dot pestilence at gmail dot com
3 years ago
<?php

function intdiv_2(\$a, \$b)  {

\$val = \$a / \$b;
return (
\$val < 0 ? "ceil" : "floor") (\$val);
}

?>

Aren't this?!