PHP

php replace space with 20

//Replace space with %20 for url to understand
$new = str_replace(' ', '%20', $your_string);

//Alternate for URL use, use this
urlencode ( string $str )

replace _ with space php

$journalName = str_replace(' ', '_', $journalName);

php string replace space

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

replace _ with space php

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