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trim (PHP 3, PHP 4, PHP 5) trim -- Strip whitespace (or other characters) from the beginning and end of a string 说明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)), the NUL-byte.
"\x0B" (ASCII 11
(0x0B)), a vertical tab.
参数
- 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.
例
例子 1. Usage example of trim() |
<?php
$text = "\t\tThese are a few words :) ... ";
echo trim($text); echo trim($text, " \t."); $clean = trim($binary, "\x00..\x1F");
?>
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例子 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);
?>
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上例将输出： 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"
} |
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substr