trim
(PHP 3, PHP 4, PHP 5)
trim -- Strip whitespace (or other characters) from the beginning and end of a string
Beskrivelse
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.
Parameterliste
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.
Returneringsværdier
The trimmed string.
Eksempler
Eksempel 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($clean);
?>
|
Ovenstående eksempel vil udskrive: string(32) " These are a few words :) ... "
string(16) " Example string
"
string(11) "Hello World"
string(28) "These are a few words :) ..."
string(24) "These are a few words :)"
string(5) "o Wor"
string(14) "Example string" |
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Eksempel 2. Trimming array values with trim()
<?php function trim_value(&$value) { $value = trim($value); }
$fruit = array('apple','banana ', ' cranberry '); var_dump($fruit);
array_walk($fruit, 'trim_value'); var_dump($fruit);
?>
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Ovenstående eksempel vil udskrive: 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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