(PHP 7)
IntlChar::isdefined — Check whether the code point is defined
public static IntlChar::isdefined ( mixed $codepoint ) : bool
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).
codepoint
The int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Returns true if codepoint is a defined character, false if not.
Example #1 Testing different code points
<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u{FDD0}"));
?> The above example will output:
bool(true) bool(true) bool(false)
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https://www.php.net/manual/en/intlchar.isdefined.php