take this string as an example: "will see you in London tomorrow and Kent the day after tomorrow".
How would I convert this to an associative array that contains the keywords as keys, whilst preferably missing out the common words, like this:
Array ( [tomorrow] => 2 [London] => 1 [Kent] => 1)
Any help greatly appreciated.
I would say you could :
explodepreg_splitarray_filter to only keep the lines (i.e. words) you want
array_count_values on the resulting list of words
EDIT : and, just for fun, here's a quick example :
First of all, the string, that gets exploded into words :
$str = "will see you in London tomorrow and Kent the day after tomorrow";
$words = preg_split('/\s+/', $str, -1, PREG_SPLIT_NO_EMPTY);
var_dump($words);
Which gets you :
array
0 => string 'will' (length=4)
1 => string 'see' (length=3)
2 => string 'you' (length=3)
3 => string 'in' (length=2)
4 => string 'London' (length=6)
5 => string 'tomorrow' (length=8)
6 => string 'and' (length=3)
7 => string 'Kent' (length=4)
8 => string 'the' (length=3)
9 => string 'day' (length=3)
10 => string 'after' (length=5)
11 => string 'tomorrow' (length=8)
function filter_words($word) {
// a pretty simple filter ^^
if (strlen($word) >= 5) {
return true;
} else {
return false;
}
}
$words_filtered = array_filter($words, 'filter_words');
var_dump($words_filtered);
Which outputs :
array
4 => string 'London' (length=6)
5 => string 'tomorrow' (length=8)
10 => string 'after' (length=5)
11 => string 'tomorrow' (length=8)
$counts = array_count_values($words_filtered);
var_dump($counts);
And the final result :
array
'London' => int 1
'tomorrow' => int 2
'after' => int 1
Have fun !
str_word_count might also be interesting: php.net/manual/en/function.str-word-count.php
int", "string", and stuff like that in the output I presented are there because I used var_dump, which is great for inspecting variables -- but not quite when it comes to displaying them to user ;-) ;;; it's just a matter of displaying the data with something else than var_dump.
You could have a table of common words, then go through your string one word at a time, checking if it exists in the table, if not, then add it to your associative array, or +1 to it if it already exists.
using a blacklist of words not to be included
$str = 'will see you in London tomorrow and Kent the day after tomorrow';
$skip_words = array( 'in', 'the', 'will', 'see', 'and', 'day', 'you', 'after' );
// get words in sentence that aren't to be skipped and count their values
$words = array_count_values( array_diff( explode( ' ', $str ), $skip_words ) );
print_r( $words );
