strcmp（）在php中不起作用

Question

I use the strcmp() to compare two strings in php, code below:

$tagname = "td";
$acq_data = extracting_data_tagname($url, $tagname); 

$dir = $acq_data[205];  
echo "this is $dir";
echo strcmp($dir, "NW");

The Result print: this is NW -1

Why the strcmp($dir, "NW") =-1, it should be =0, Anyone can tell me what's the problem? Thanks!

Answer 1

If you think that $dir has NW value you should try with trim() function:

echo strcmp(trim($dir), "NW");

If it will return 0, it means that you have some whitespaces at the beginning or at the end of $dir variable.