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

I think str_replace() might be more appropriate here:

$id = "aa aa";
$id = str_replace(' ', '_', $id);
echo $id;

Answer 2

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"

<?php

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

?>

Answer 3

You have forgotten to assign the result of preg_replace into your $id

$id = preg_replace('/\s+/', '_', $id);

Answer 4

The function preg_replace doesn't modify the string in-place. It returns a new string with the result of the replacement. You should assign the result of the call back to the $id variable:

$id = preg_replace('/\s+/', '_', $id);

Answer 5

Sometimes, in linux/unix environment,

$strippedId = preg_replace('/\h/u', '',  $id);

Try this as well.