octdec
(PHP 4, PHP 5)
octdec — 八进制转换为十进制
说明
$octal_string
)
返回 octal_string
参数所表示的八进制数的十进制等值。
参数
-
octal_string -
要转换的八进制的字符串
返回值
octal_string 的十进制的表示
更新日志
| 版本 | 说明 |
|---|---|
| 4.1.0 | 该函数可以处理 integer 大数字，这种情况下，它会返回 float 类型。 |
范例
Example #1 octdec() 例子
<?php
echo octdec ( '77' ) . "\n" ;
echo octdec ( decoct ( 45 ));
?> 以上例程会输出：
63 45
参见
- decoct() - 十进制转换为八进制
- bindec() - 二进制转换为十进制
- hexdec() - 十六进制转换为十进制
- base_convert() - 在任意进制之间转换数字
用户评论:
[#1] contato at andersonfraga dot net [2008-08-18 13:30:10]
Number is octal?
Simple and easy:
<?php
function is_octal($x) {
return decoct(octdec($x)) == $x;
}
echo is_octal(077); // true
echo is_octal(195); // false
?>
Thanks
[]'s
[#2] harry at disgruntledgoat dot com [2007-03-27 03:03:29]
Calling the sticky bit "text" is not erroneous: On UNIX back in 1974, it instructed the operating system to retain the text segment of the program in swap space after the process exited. This speeded subsequent executions by allowing the kernel to make a single operation of moving the program from swap to real memory.
[#3] [2002-09-11 01:51:28]
The 'S' flag for Unix file access rights is badly computed in the above sample.
If the corresponding 'x' bit (exec) is not set, and the 's' bit (setgid/setuid/sticky) is set, then the flag should not be displayed as and uppercase 'S', but as a lower case 's'. Also the sticky bit (mainly used for folders with public right access rights such as /tmp to protect against deletion by non owner) is badly named ("text"?).