ltrim

(PHP 3, PHP 4 , PHP 5)

ltrim -- Strip whitespace from the beginning of a string

Description

string ltrim ( string str [, string charlist])

Not: The second parameter was added in PHP 4.1.0

This function returns a string with whitespace stripped from the beginning of str. Without the second parameter, ltrim() 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.

You can also specify the characters you want to strip, by means of the charlist parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters.

�rnek 1. Usage example of ltrim()


<?php



$text = "\t\tThese are a few words :) ...  ";

$trimmed = ltrim($text);

// $trimmed = "These are a few words :) ...  "

$trimmed = ltrim($text, " \t.");

// $trimmed = "These are a few words :) ...  "

$clean = ltrim($binary, "\x00..\x1F");

// trim the ASCII control characters at the beginning of $binary 

// (from 0 to 31 inclusive)



?>

See also trim() and rtrim().

md5_file

localeconv

Last updated: Sat, 17 Jul 2004

add a note User Contributed Notes
ltrim

Usamah M dot Ali (usamah1228 at gmail dot com)
04-Feb-2008 02:42


For those who use right-to-left languages such as Arabic, Hebrew, etc., it's worth mentioning that ltrim() (which stands for left trim) & rtrim() (which stands for right trim) DO NOT work contextually. The nomenclature is rather semantically incorrect. So in an RTL script, ltrim() will trim text from the right direction (i.e. beginning of RTL strings), and rtrim() will trim text from the left direction (i.e. end of RTL strings).

John Sherwood
06-Aug-2006 12:13


To remove leading/trailing zeroes (example: "0123.4560"), doing a += 0 is easier than trim tricks.

jan
10-Jul-2006 02:30


if you have a numer like 0310, don't use this code:



$number = '0310';

$number = ltrim( $number, "\0x30" );

echo $number;



output: 10



for a correct output use:



$number = '0310';

$number = ltrim( $number, "0" );

echo $number;



output: 310



the "\0x30" works only with the first 32 ascii characters

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md5_file

localeconv

Last updated: Sat, 17 Jul 2004