IntlChar::isdefined

(PHP 7)

IntlChar::isdefined — Check whether the code point is defined

public static bool IntlChar::isdefined ( mixed $codepoint )

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).

Nota:
Note that non-character code points (e.g., U+FDD0) are not "defined" (they are Cn), but surrogate code points are "defined" (Cs).

codepoint: Um codepoint integer (por exemplo 0x2603 para U+2603 SNOWMAN), ou um caracter codificado como uma string UTF-8 (exemplo "\u{2603}")

Returns TRUE if codepoint is a defined character, FALSE if not.

Exemplo #1 Testando codepoints diferentes


<?php
var_dump(IntlChar::isdefined("A"));
var_dump(IntlChar::isdefined(" "));
var_dump(IntlChar::isdefined("\u{FDD0}"));
?>

O exemplo acima irá imprimir:

bool(true)
bool(true)
bool(false)

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