On Thu, 26 Jun 2003 13:25:39 +0200, you wrote:
># i would like a similar function that removes interpuntuation like "." etc.
># all i want remaining in the array are the separate words, all in lower
>case
How do you define a word? Is a hyphen part of a word? Do you want to strip
out numbers? Make a list of valid characters, and remove everything else.
For example, if my valid characters were the set
' abcdef';
I'd do something like this:
function strfilter($s, $v) {
$r = '';
for ($i = 0; $i < strlen($s); $i++) {
if (strchr($v, $s[$i])) {
$r .= $s[$i];
}
}
return ($r);
}
echo (strfilter ($string, ' abcdef'));
> sort($array); # sort array elements in alphabetical order
> $num = count($array); # count the number of elements in the array
> for ($c=0; $c<=$num; $c++) #as long as function has nog reached past last
>element in array
> {
> $wordInText = $array[$c]; #array element is word in text
> echo "$wordInText<br>"; #print word in text
> }
>
># i would like a function that pushes this word into a second array.
># before pushing, it has to check whether or not the same word is already
>in the array.
This is way faster when implemented as a binary tree. However, for all I
know that's how PHP arrays are implemented under the hood.
># if it is: do not push word into array, but add "1" to the number of occurrences
>of that word
># if it is not: push this new word into array
># all of this has to result into a word - frequency array (content analysis
>of free text)
># question 1: how do i produce such an array?
># question 2: how do i get the two elements (word and number of occurrences)
Pseudocode:
$results = array();
foreach ($word in $sentence) {
if ($results.has_key ($word)) {
$results[$word] += 1;
} else {
$results[$word] = 1;
}
}
># together out of the array and print them to the screen?
># f.e.: the word "computer" occurred two times in this text.
Pseudocode:
foreach ($results as $key=>$value) {
echo ("the word $key appears $value times in this text<br>");
}
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