IntlChar::isdefined
(PHP 7, PHP 8)
IntlChar::isdefined — Check whether the code point is defined
Description
$codepoint
): ?boolDetermines 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).
Parameters
-
codepoint
-
The int codepoint value (e.g.
0x2603
for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g."\u"
)
Return Values
Returns true
if
codepoint
is a defined character, false
if not. Returns null
on failure.
Examples
Example #1 Testing different code points
<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u"));
?>
The above example will output:
bool(true) bool(true) bool(false)
See Also
- 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