PHP trim() Function

The trim() function removes whitespace and other predefined characters from both sides of a string.

Related functions:

  • ltrim() - Removes whitespace or other predefined characters from the left side of a string
  • rtrim() - Removes whitespace or other predefined characters from the right side of a string
string trim ( string $str [, string $character_mask = " \t\n\r\0\x0B" ] )

This function returns a string with whitespace stripped from the beginning and end of str. Without the second parameter, trim() 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.
  • "\x0B" (ASCII 11 (0x0B)), a vertical tab.

Example -

Example #1 Usage example of trim()

Example #2 Trimming array values with trim()

ParameterDescription
strThe string that will be trimmed.
character_maskOptionally, the stripped characters can also be specified using the character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters.

The trimmed string.