What are common methods in PHP to check if a string contains more than just whitespace characters?

To check if a string contains more than just whitespace characters in PHP, you can use a combination of functions like trim() to remove leading and trailing whitespace, and then check the length of the remaining string using strlen(). If the length is greater than 0, it means the string contains more than just whitespace characters. 

$string = "   ";
$trimmedString = trim($string);

if(strlen($trimmedString) > 0) {
    echo "String contains more than just whitespace characters.";
} else {
    echo "String contains only whitespace characters.";
}

Keywords

PHP string whitespace regular expression trim

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