ltrim

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

str

The input string.

character_mask

You 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"
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