• 首页
  • vue
  • TypeScript
  • JavaScript
  • scss
  • css3
  • html5
  • php
  • MySQL
  • redis
  • jQuery
  • IntlChar::isdefined()

    版本:php7

    (PHP 7)

    Check whether the code point is defined

    说明

    publicstaticIntlChar::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).

    参数

    $codepoint

    The integer codepoint value(e.g.0x2603forU+2603 SNOWMAN), or the character encoded as a UTF-8 string(e.g."u{2603}")

    返回值

    Returns TRUE if$codepointis a defined character,FALSE if not.

    范例

    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