ltrim

(PHP 4, PHP 5)

ltrim — Strip whitespace (or other characters) from the beginning of a string

Descrierea

string ltrim ( string $str [, string $charlist ] )

Strip whitespace (or other characters) from the beginning of a string.

Parametri

str: The input string.
charlist: 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.

Valorile întroarse

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.

Istoria schimbărilor

Versiunea	Descriere
4.1.0	The `charlist` parameter was added.

Exemple

Example #1 Usage example of ltrim()


<?php

$text = "\t\tThese are a few words :) ...  ";
$binary = "\x09Example string\x0A";
$hello  = "Hello World";
var_dump($text, $binary, $hello);

print "\n";


$trimmed = ltrim($text);
var_dump($trimmed);

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

$trimmed = ltrim($hello, "Hdle");
var_dump($trimmed);

// trim the ASCII control characters at the beginning of $binary
// (from 0 to 31 inclusive)
$clean = ltrim($binary, "\x00..\x1F");
var_dump($clean);

?>

Exemplul de mai sus va afişa:

string(32) "        These are a few words :) ...  "
string(16) "    Example string
"
string(11) "Hello World"

string(30) "These are a few words :) ...  "
string(30) "These are a few words :) ...  "
string(7) "o World"
string(15) "Example string
"

Vedeţi de asemenea

trim() - Strip whitespace (or other characters) from the beginning and end of a string
rtrim() - Strip whitespace (or other characters) from the end of a string

add a note User Contributed Notes
ltrim

Usamah M dot Ali (usamah1228 at gmail dot com)
04-Feb-2008 10:42


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 07:13


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

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Last updated: Fri, 20 Nov 2009