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trim

(PHP 4, PHP 5, PHP 7, PHP 8)

trim — Strip whitespace (or other characters) from the beginning and end of a string

Опис

trim(string $string, string $characters = " \n\r\t\v\x00"): string

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

Параметри

string

The string that will be trimmed.

characters
Символи, що треба вилучити, можна вказати за допомогою необов'язкового параметра characters. Необхідно просто записати туди усі непотрібні символи. За допомогою .. можна задати діапазон символів за зростанням.

Значення, що повертаються

The trimmed string.

Приклади

Приклад #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);

$trimmed = trim($hello, 'HdWr');
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);

?>

Поданий вище приклад виведе:

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(9) "ello Worl"
string(14) "Example string"

Приклад #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);

?>

Поданий вище приклад виведе:

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"
}

Примітки

Зауваження: Possible gotcha: removing middle characters

Because trim() trims characters from the beginning and end of a string, it may be confusing when characters are (or are not) removed from the middle. trim('abc', 'bad') removes both 'a' and 'b' because it trims 'a' thus moving 'b' to the beginning to also be trimmed. So, this is why it "works" whereas trim('abc', 'b') seemingly does not.

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