Function ltrim

Strips all whitespaces from the beginning of the string. Without the second parameter, this will trim 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
• "\x0B" (ASCII 11 (0x0B)), a vertical tab