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trim
Strip whitespace (or other characters) from the beginning and end of a string
(PHP 4, PHP 5)
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:
-
" " (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)), theNUL-byte. -
"\x0B" (ASCII
11(0x0B)), a vertical tab.
Parameters
- 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.
Examples
Example 2480. 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($clean);
?>The above example will output:
string(32) " These are a few words :) ... "
string(16) " Example string
"
string(11) "Hello World"
string(28) "These are a few words :) ..."
string(24) "These are a few words :)"
string(5) "o Wor"
string(14) "Example string"
Example 2481. Trimming array values with trim()
<?php
function trim_value(&$value)
{
$value = trim($value);
}
$fruit = array('apple','banana ', ' cranberry ');
var_dump($fruit);
array_walk($fruit, 'trim_value');
var_dump($fruit);
?>The above example will output:
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"
}