Number is octal?
Simple and easy:
<?php
function is_octal($x) {
return decoct(octdec($x)) == $x;
}
echo is_octal(077); // true
echo is_octal(195); // false
?>
Thanks
[]'s
(PHP 4, PHP 5, PHP 7, PHP 8)
octdec — 八进制转换为十进制
返回 octal_string
参数所表示的八进制数的十进制等值。octal_string
中的任何无效字符都会默认忽略。自 PHP 7.4.0 起，弃用使用任何无效字符。
octal_string要转换的八进制的字符串。
octal_string 的十进制的表示
| 版本 | 说明 |
|---|---|
| 7.4.0 | 传递任何无效字符现在将生成弃用通知。但仍会计算结果，就好像无效字符不存在一样。 |
示例 #1 octdec() 示例
<?php
echo octdec('77') . "\n";
echo octdec(decoct(45));
?>以上示例会输出：
63 45
Number is octal?
Simple and easy:
<?php
function is_octal($x) {
return decoct(octdec($x)) == $x;
}
echo is_octal(077); // true
echo is_octal(195); // false
?>
Thanks
[]'sThe '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"?).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.