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    IntlChar::isIDIgnorable

    (PHP 7, PHP 8)

    IntlChar::isIDIgnorable — Check if code point is an ignorable character

    说明

    public static IntlChar::isIDIgnorable(int|string $codepoint): ?bool

    Determines if the specified character should be regarded as an ignorable character in an identifier.

    true for characters with general category "Cf" (format controls) as well as non-whitespace ISO controls (U+0000..U+0008, U+000E..U+001B, U+007F..U+009F).

    注意:

    Note that Unicode just recommends to ignore Cf (format controls).

    参数

    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}")

    返回值

    Returns true if codepoint is ignorable in identifiers, false if not. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::isIDIgnorable("A"));
    var_dump(IntlChar::isIDIgnorable(" "));
    var_dump(IntlChar::isIDIgnorable("\u{007F}"));
    ?>

    以上示例会输出：

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

    参见

    • IntlChar::isIDStart() - Check if code point is permissible as the first character in an identifier
    • IntlChar::isIDPart() - Check if code point is permissible in an identifier
    • IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT

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