(PHP 4, PHP 5, PHP 7, PHP 8)
octdec — Octal to decimal
Description
octdec(string $octal_string): int|float
Parameters
octal_stringThe octal string to convert. Any invalid characters in octal_string are silently ignored. As of PHP 7.4.0 supplying any invalid characters is deprecated.
Return Values
The decimal representation of octal_string
Changelog
7.4.0 | Passing invalid characters will now generate a deprecation notice. The result will still be computed as if the invalid characters did not exist. |
Examples
Example #1 octdec() example
<?php
echo octdec('77') . "\n";
echo octdec(decoct(45));
?>
The above example will output:
Notes
Note:
The function can convert numbers that are too large to fit into the platforms int type, larger values are returned as float in that case.
See Also
- decoct() - Decimal to octal
- bindec() - Binary to decimal
- hexdec() - Hexadecimal to decimal
- base_convert() - Convert a number between arbitrary bases
contato at andersonfraga dot net ¶
14 years ago
Number is octal?
Simple and easy:
<?phpfunction is_octal($x) {
return decoct(octdec($x)) == $x;
}
echo
is_octal(077); // trueecho is_octal(195); // false?>
Thanks
[]'s
Anonymous ¶
20 years ago
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"?).
harry at disgruntledgoat dot com ¶
15 years ago
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.
❮ PHP Math Reference
Example
Convert octal to decimal:
<?php
echo octdec("36") . "<br>";
echo octdec("12") . "<br>";
echo octdec("3063") . "<br>";
echo octdec("106");
?>
Try it Yourself »
Definition and Usage
The octdec() function converts an octal number to a decimal number.
Tip: To convert decimal to octal, look at the decoct() function.
Syntax
Parameter Values
octal_string | Required. Specifies the octal string to convert |
Technical Details
The decimal value of octal_string |
Float / Integer |
4+ |
❮ PHP Math Reference
❮ Tham khảo Toán PHP
Ví dụ
Chuyển đổi bát phân sang thập phân:
<?php
echo octdec(“36”) . “<br>”;
echo octdec(“12”) . “<br>”;
echo octdec(“3063”) . “<br>”;
echo octdec(“106”);
?>
Hãy tự mình thử »
Định nghĩa và Cách sử dụng
Hàm octdec () chuyển đổi một số bát phân thành một số thập phân.
Mẹo: Để chuyển đổi thập phân sang bát phân, hãy xem hàm decoct () .
Cú pháp
Giá trị tham số
octal_string | Required. Specifies the octal string to convert |
Chi tiết kỹ thuật
Giá trị thập phân của chuỗi bát phân |
Phao / Số nguyên |
4+ |
❮ Tham khảo Toán PHP
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