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    IntlChar::isWhitespace

    (PHP 7, PHP 8)

    IntlChar::isWhitespace — Check if code point is a whitespace character according to ICU

    说明

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

    Determines if the specified code point is a whitespace character according to ICU.

    A character is considered to be a ICU whitespace character if and only if it satisfies one of the following criteria:

    • It is a Unicode Separator character (categories "Z" = "Zs" or "Zl" or "Zp"), but is not also a non-breaking space (U+00A0 NBSP or U+2007 Figure Space or U+202F Narrow NBSP).
    • It is U+0009 HORIZONTAL TABULATION.
    • It is U+000A LINE FEED.
    • It is U+000B VERTICAL TABULATION.
    • It is U+000C FORM FEED.
    • It is U+000D CARRIAGE RETURN.
    • It is U+001C FILE SEPARATOR.
    • It is U+001D GROUP SEPARATOR.
    • It is U+001E RECORD SEPARATOR.
    • It is U+001F UNIT SEPARATOR.

    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 a whitespace character according to ICU, false if not. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::iswhitespace("A"));
    var_dump(IntlChar::iswhitespace(" "));
    var_dump(IntlChar::iswhitespace("\n"));
    var_dump(IntlChar::iswhitespace("\t"));
    var_dump(IntlChar::iswhitespace("\u{00A0}"));
    ?>

    以上示例会输出：

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

    参见

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