PHP trim() Function: Description, Syntax, Parameters, Return Value, and Examples

The trim() function is a built-in PHP function that removes whitespace and predefined characters from both ends of a string.

Related Functions

ltrim() : removes characters from the left side of a string. rtrim() : removes characters from the right side of a string.

Syntax

<code>trim($string, $charlist)</code>

Parameters

$string (required): the input string.

$charlist (optional): a list of characters to strip. If omitted, the function removes the following characters: \0 (NULL), \t (tab), \n (newline), \x0B (vertical tab), \r (carriage return), and ordinary whitespace.

Return value : the trimmed string.

Usage Examples

Example 1

<code>&lt;?php
$str = "Hello World!";
echo trim($str, "Hell!");
?&gt;</code>

Output:

<code>o World</code>

Example 2

<code>&lt;?php
header("content-type:text/html;charset=utf-8");
$str = "  欢迎来到php中文网！  ";
echo trim($str);
?&gt;</code>

Output:

<code>欢迎来到php中文网！</code>

Learning Recommendations

Links to tutorials on Vue3+Laravel8+Uniapp, Vue3+TP6 API social e‑commerce development, Swoole, and Workerman+TP6 real‑time chat systems are provided.