IntlChar::isdefined
(PHP 7)
IntlChar::isdefined — Check whether the code point is defined
说明
Determines whether the specified code point is "defined", which usually means that it is assigned a character.
TRUE
for general categories other than "Cn" (other, not assigned).
Note:
Note that non-character code points (e.g., U+FDD0) are not "defined" (they are Cn), but surrogate code points are "defined" (Cs).
参数
返回值
Returns TRUE
if codepoint
is a defined character, FALSE
if not.
范例
Example #1 Testing different code points
<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u{FDD0}"));
?>
以上例程会输出:
bool(true) bool(true) bool(false)
参见
- IntlChar::isdigit() - Check if code point is a digit character
- IntlChar::isalpha() - Check if code point is a letter character
- IntlChar::isalnum() - Check if code point is an alphanumeric character
- IntlChar::isupper() - Check if code point has the general category "Lu" (uppercase letter)
- IntlChar::islower() - Check if code point is a lowercase letter
- IntlChar::istitle() - Check if code point is a titlecase letter