if (in_array(<title>, $SomeArray)) return true - php

Question

I have problem that it cant detect every word in string. similar to filter or tag or category or sort of..
$title = "What iS YouR NAME?";
$english = Array( 'Name', 'Vacation' );
if(in_array(strtolower($title),$english)){
$language = 'english';
} else if(in_array(strtolower($title),$france)){
$language = 'france';
} else if(in_array(strtolower($title),$spanish)){
$language = 'spanish';
} else if(in_array(strtolower($title),$chinese)){
$language = 'chinese';
} else if(in_array(strtolower($title),$japanese)){
$language = 'japanese';
} else {
$language = null;
}
output is null.. =/

Answer 1

No real problem here... the string in $title isn't in any of the arrays you are testing with, even in lower case.
Try testing every word in each language tab against the string instead.
$english = Array( 'Name', 'Vacation' );
$languages = array('english'=>$english,
'france'=>$france,
'spanish'=>$spanish,
'chinese'=>$chinese,
'japenese'=>$japenese);
while($line = mysql_fetch_assoc($result)) {
$title = $line['title'];
//$lower_title = strtolower($title); stristr() instead.
$language_found = false;
foreach($languages as $language_name=>$language) {
idx = 0;
while(($language_found === false) && idx < count($language)) {
$word = $language[$idx];
if(stristr($title, $word) !== false) {
$language_found = $language_name;
}
$idx++;
}
}
// got language name or false...
}
You could also breaking the string using explode of course and testing each word in the created array for each language.

Answer 2

The output is null because the string "what is your name?" is not in any of the language arrays. Note that you should not write language names in code.
Instead, a dictionary or array of languages (in the form of dictionaries or objects) allows future extension and separates data from control logic.

Answer 3

There are several logic issues:
The first problem is that you are trying to see if a multi-word string is in an array of single words. That will always fail to find a match. You would need to break up $title with explode and loop over the words.
ie) $title_words = explode(' ', strtolower($title));
foreach($title_words as $word){
//check language
//now you can use in_array and expect some matches
}
However that presents a second issue.What if a word is in multiple languages?
A third issue is in your sample, you have converted your search string to lowercase, but your array of matches has all words with an upper case first letter.
ie)
$english = Array( 'Name', 'Vacation' ); should be
$english = array( 'name', 'vacation' );
if you expect matches