Using PHP trim() to Remove Whitespace and Specified Characters

In PHP programming, handling strings often requires removing whitespace from both ends, and the built‑in trim function provides this capability.

The syntax of trim is string trim ( string $str [, string $charlist ] ) , where $str is the input string and $charlist (optional) specifies characters to strip.

Example 1 demonstrates trimming spaces:

// Example string
$str = "   Hello, World!   ";

// Remove spaces from both ends
$result = trim($str);

// Output result
echo $result;

The code outputs Hello, World! .

Example 2 shows removing specific characters (asterisks) by passing a second argument:

// Example string
$str = "**Hello, World!**";

// Remove '*' characters from both ends
$result = trim($str, "*");

// Output result
echo $result;

The result is Hello, World! without the asterisks.

Besides trim , PHP also offers ltrim and rtrim to trim only the left or right side of a string, respectively.

Summary

trim removes whitespace and optional characters from both ends of a string.

Its syntax is string trim ( string $str [, string $charlist ] ) .

Providing a second argument allows removal of specific characters.

ltrim and rtrim perform one‑sided trimming.

Understanding trim helps developers handle strings efficiently in PHP applications.