Strip whitespace (or other characters) from the beginning of a string
Syntax
ltrim ( string $str [, string $character_mask = " \t\n\r\0\x0B" ] ) : string
Parameters
strThe input string.
character_maskYou can also specify the characters you want to strip, by means of the character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters. Without the character_mask parameter, ltrim() will strip these characters:
| "\0" | ASCII 0 (0x00) | NUL-byte |
| "\t" | ASCII 9 (0x09) | horizontal tab |
| "\n" | ASCII 10 (0x0A) | new line (line feed) |
| "\v" | ASCII 11 (0x0B) | vertical tab |
| "\r" | ASCII 13 (0x0D) | carriage return |
| " " | ASCII 32 (0x20) | ordinary space |
Return
Returns a string with whitespace stripped from the beginning of str.
Examples
1 · str
<? $str = "\0\t\n\v\r \x00\x09\x0A\x0B\x0D\x20ltrim"; $return = ltrim($str); var_dump($str, $return); ?>
string(17) "
ltrim"
string(5) "ltrim"
2 · character_mask · list
<? $str = "\0\t\n\v\r \x00\x09\x0A\x0B\x0D\x20ltrim"; $character_mask = "\0\t\n\v\r lt"; $return = ltrim($str, $character_mask); var_dump($str, $return); ?>
string(17) "
ltrim"
string(3) "rim"
3 · character_mask · Range
<? $str = "\0\t\n\v\r \x00\x09\x0A\x0B\x0D\x20ltrim"; $character_mask = "\x00..\x20lt"; $return = ltrim($str, $character_mask); var_dump($str, $return); ?>
string(17) "
ltrim"
string(3) "rim"
