ltrim

(PHP 4, PHP 5, PHP 7)

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

Descrierea

ltrim ( string $string , string $characters = " \n\r\t\v\0" ) : string

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

Parametri

string

The input string.

characters

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

Valorile întoarse

This function returns a string with whitespace stripped from the beginning of string. 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.
  • "\v" (ASCII 11 (0x0B)), a vertical tab.

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 afișa:

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
"

A se vedea și

  • 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