Math 函数
PHP Manual

decbin

(PHP 4, PHP 5, PHP 7)

decbin十进制转换为二进制

说明

string decbin ( int $number )

返回一字符串,包含有给定 number 参数的二进制表示。所能转换的最大数值为十进制的 4294967295,其结果为 32 个 1 的字符串。

参数

number

Decimal value to convert

Range of inputs on 32-bit machines
positive number negative number return value
0   0
1   1
2   10
... normal progression ...
2147483646   1111111111111111111111111111110
2147483647 (largest signed integer)   1111111111111111111111111111111 (31 1's)
2147483648 -2147483648 10000000000000000000000000000000
... normal progression ...
4294967294 -2 11111111111111111111111111111110
4294967295 (largest unsigned integer) -1 11111111111111111111111111111111 (32 1's)
Range of inputs on 64-bit machines
positive number negative number return value
0   0
1   1
2   10
... normal progression ...
9223372036854775806   111111111111111111111111111111111111111111111111111111111111110
9223372036854775807 (largest signed integer)   111111111111111111111111111111111111111111111111111111111111111 (63 1's)
  -9223372036854775808 1000000000000000000000000000000000000000000000000000000000000000
... normal progression ...
  -2 1111111111111111111111111111111111111111111111111111111111111110
  -1 1111111111111111111111111111111111111111111111111111111111111111 (64 1's)

返回值

Binary string representation of number

范例

Example #1 decbin() 例子

<?php
echo decbin(12) . "\n";
echo 
decbin(26);
?>

以上例程会输出:

1100
11010

参见


Math 函数
PHP Manual