How Can I Truncate Strings in PHP to the Nearest Word?

Truncating Strings in PHP to the Nearest Word

To crop a string at the end of the last word before a specified character count, PHP provides several methods.

Using wordwrap Function:

The wordwrap function divides text into multiple lines with a maximum width, automatically breaking at word boundaries. By taking only the first line, you can truncate the text to the nearest word:

$truncated_string = substr($string, 0, strpos(wordwrap($string, $desired_width), "\n"));

Edge Case Handling:

This method doesn't handle texts shorter than the desired width. For that, use the following:

if (strlen($string) > $desired_width) {
    $string = substr($string, 0, strpos(wordwrap($string, $desired_width), "\n"));
}

Token Truncation:

To resolve potential issues with newlines in the text, this method splits the text into tokens (words, whitespace, and newlines) and accumulates their lengths:

function tokenTruncate($string, $desired_width) {
    $parts = preg_split('/([\s\n\r]+)/', $string, null, PREG_SPLIT_DELIM_CAPTURE);
    $length = 0;
    $last_part = 0;
    for (; $last_part < count($parts); ++$last_part) {
        $length += strlen($parts[$last_part]);
        if ($length > $desired_width) { break; }
    }
    return implode(array_slice($parts, 0, $last_part));
}

This method also handles UTF8 characters.

Unit Testing:

class TokenTruncateTest extends PHPUnit_Framework_TestCase {
    // ... test cases ...
}

Additional Notes:

• This method relies on word boundaries.
• Handling special characters like emojis or different languages may require additional considerations.

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