PHP 8.4.0 RC3 available for testing

    mb_ltrim

    (PHP 8 >= 8.4.0)

    mb_ltrim — Strip whitespace (or other characters) from the beginning of a string

    说明

    mb_ltrim(string $string, string $characters = null, string $encoding = null): string

    Performs a multi-byte safe ltrim() operation. Strip whitespace (or other characters) from the beginning of a string.

    Without the second parameter, mb_ltrim() will strip these characters:

    • " " (ASCII 32 (0x20)), an ordinary space.
    • "\t" (ASCII 9 (0x09)), a tab.
    • "\n" (ASCII 10 (0x0A)), a new line (line feed).
    • "\r" (ASCII 13 (0x0D)), a carriage return.
    • "\0" (ASCII 0 (0x00)), the NUL-byte.
    • "\v" (ASCII 11 (0x0B)), a vertical tab.

    参数

    string
    The input string.
    characters
    Optionally, the stripped characters can also be specified using the characters parameter. Simply list all characters that need to be stripped. With .. it is possible to specify an incrementing range of characters.
    encoding
    The string encoding.

    返回值

    This function returns a string with whitespace stripped from the beginning of string.

    参见

    • mb_trim() - Strip whitespace (or other characters) from the beginning and end of a string
    • mb_rtrim() - Strip whitespace (or other characters) from the end of a string
    • ltrim() - 删除字符串开头的空白字符（或其他字符）

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