mb_ltrim

(PHP 8 >= 8.4.0)

mb_ltrimStrip 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 SP character 0x20, an ordinary space.
  • "\t": ASCII HT character 0x09, a tab.
  • "\n": ASCII LF character 0x0A, a new line (line feed).
  • "\r": ASCII CR character 0x0D, a carriage return.
  • "\0": ASCII NUL character 0x00, the NUL-byte.
  • "\v": ASCII VT character 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)