preg_replace all spaces

Question

I\'m trying to replace all spaces with underscores and the following is not working:

$id = \"aa aa\";
echo $id;
preg_replace(\'/\\s+/\', \'_\', $id);
echo $i         


        

Answer 1

We need to replace the space in the string "aa aa" with '_' (underscore). The \s+ is used to match multiple spaces. The output will be "aa_aa"