What is the best way to truncate a string to 40 characters only at a comma in PHP?

When truncating a string to a specific length in PHP, we can use the `substr` function to extract a portion of the string. To truncate at a comma within the first 40 characters, we can find the position of the comma within the substring of the first 40 characters, and then truncate the string at that position. This can be achieved by using functions like `substr`, `strpos`, and `mb_substr` in PHP. 

function truncateAtComma($string, $length) {
    if (mb_strlen($string) <= $length) {
        return $string;
    }
    
    $subString = mb_substr($string, 0, $length);
    $commaPosition = strrpos($subString, ',');
    
    if ($commaPosition !== false) {
        return mb_substr($subString, 0, $commaPosition);
    } else {
        return $subString;
    }
}

// Example usage
$string = "This is a long string, containing some text.";
$truncatedString = truncateAtComma($string, 40);
echo $truncatedString;

Keywords

PHP string truncation substr strpos comma detection

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