Funciones de strings
PHP Manual

trim

(PHP 4, PHP 5)

trimStrip whitespace (or other characters) from the beginning and end of a string

Descripción

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

This function returns a string with whitespace stripped from the beginning and end of str. Without the second parameter, trim() will strip these characters:

Parámetros

str

The string that will be trimmed.

charlist

Optionally, the stripped characters can also be specified using the charlist parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters.

Valores devueltos

The trimmed string.

Historial de cambios

Versión Descripción
4.1.0 The optional charlist parameter was added.

Ejemplos

Example #1 Usage example of trim()

<?php

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

print 
"\n";

$trimmed trim($text);
var_dump($trimmed);

$trimmed trim($text" \t.");
var_dump($trimmed);

$trimmed trim($hello"Hdle");
var_dump($trimmed);

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

?>

El resultado del ejemplo sería:

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

string(28) "These are a few words :) ..."
string(24) "These are a few words :)"
string(5) "o Wor"
string(14) "Example string"

Example #2 Trimming array values with trim()

<?php
function trim_value(&$value

    
$value trim($value); 
}

$fruit = array('apple','banana '' cranberry ');
var_dump($fruit);

array_walk($fruit'trim_value');
var_dump($fruit);

?>

El resultado del ejemplo sería:

array(3) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(7) "banana "
  [2]=>
  string(11) " cranberry "
}
array(3) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(6) "banana"
  [2]=>
  string(9) "cranberry"
}

Ver también


Funciones de strings
PHP Manual