/**
 * 比较两个字符串长度，然后计算其差值
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
// This will return a number of how many more characters the longest string has 
function str_compare_length($str1,$str2){ 
    $len1 = strlen($str1); 
    $len2 = strlen($str2); 
    return abs($len1 - $len2); 
}
echo str_compare_length("This is the first string","This is the second string");