search a php array for partial string match

Question

I have an array and I\'d like to search for the string \'green\'. So in this case it should return the $arr[2]

$arr = array(0 =>         


        

Answer 1

In order to find out if UTF-8 case-insensitive substring is present in array, I found that this method would be much faster than using mb_strtolower or mb_convert_case:

1. Implode the array into a string: $imploded=implode(" ", $myarray);.

2. Convert imploded string to lowercase using custom function: $lowercased_imploded = to_lower_case($imploded);

   function to_lower_case($str) {

$from_array=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","Ä","Ö","Ü","Õ","Ž","Š"];

$to_array=["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","ä","ö","ü","õ","ž","š"];

foreach($from_array as $key=>$val){$str=str_replace($val, $to_array[$key], $str);}

return $str;

}

3. Search for match using ordinary strpos: if(strpos($lowercased_imploded, "substring_to_find")!==false){do something}