<?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($clean);
?>
结果如下:
string(32) " These are a few words :) ... "
string(16)" Example string
"
string(11)"Hello World"
string(28) "These are a few words :) ..."
string(24) "These are a few words :)"
string(5)"o Wor"
string(14)"Example string"
Example #2 Trimming array values with trim()
<?php
function trim_value(&$value)
{
$value = trim($value);
}
$fruit = array('apple','banana ',' cranberry ');
var_dump($fruit);
array_walk($fruit,'trim_value');
var_dump($fruit);
?>
上例结果如下:
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"
}
另外,rtrim,ltrim用法与trim用法相同。唯一的差别是ltrim去除左边的空格,rtrim去除右边的空格。这个从其首字母不难看出。