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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 7)
IntlChar::digit — Get the decimal digit value of a code point for a given radix
$codepoint
[, int $radix
= 10
] )Returns the decimal digit value of the code point in the specified radix.
If the radix is not in the range 2<=radix<=36 or if the value of codepoint
is not a valid digit in the specified radix, FALSE
is returned.
A character is a valid digit if at least one of the following is true:
codepoint
The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
radix
The radix (defaults to 10).
Returns the numeric value represented by the character in the specified radix,
or FALSE
if there is no value or if the value exceeds the radix.
此函数可能返回布尔值
FALSE
,但也可能返回等同于 FALSE
的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用
===
运算符来测试此函数的返回值。
Example #1 Testing different code points
<?php
var_dump ( IntlChar :: digit ( "0" ));
var_dump ( IntlChar :: digit ( "3" ));
var_dump ( IntlChar :: digit ( "A" ));
var_dump ( IntlChar :: digit ( "A" , 16 ));
?>
以上例程会输出:
int(0) int(3) bool(false) int(10)
IntlChar::PROPERTY_NUMERIC_TYPE