PHP Optimization performance -


i have following code, but. it's slow

<?php  class ngram {   const sample_directory = "samples/";  const generated_directory = "languages/";  const source_extension = ".txt";  const generated_extension = ".lng";  const n_gram_min_length = "1";  const n_gram_max_length = "6";  public function __construct() {     mb_internal_encoding( 'utf-8' );     $this->generatengram(); }  private function getfilepath() {     $files = array();     $excludes = array('.', '..');     $path = rtrim(self::sample_directory, directory_separator . '/');     $files = scandir($path);     $files = array_diff($files, $excludes);     foreach ($files $file) {          if (is_dir($path . directory_separator . $file))             fetchdir($path . directory_separator . $file, $callback);         else if (!preg_match('/^.*\\' . self::source_extension . '$/', $file))             continue;         else             $filespath[] = $path . directory_separator . $file;      }     unset($file);     return $filespath; } protected function removeunicharcategories($string){     //replace punctuation(' " # % & ! . : , ? ¿) become space " "     //example : 'you&me', become 'you me'.     $string = preg_replace( "/\p{po}/u", " ", $string );     //--------------------------------------------------     $string = preg_replace( "/[^\p{ll}|\p{lm}|\p{lo}|\p{lt}|\p{lu}|\p{zs}]/u", "", $string );     $string = trim($string);     $string = mb_strtolower($string,'utf-8');     return $string; } private function generatengram() {     $files = $this->getfilepath();     foreach($files $file) {         $file_content = file_get_contents($file, file_text);         $file_content = $this->removeunicharcategories($file_content);         $words = explode(" ", $file_content);         $tokens = array();         foreach ($words $word) {             $word = "_" . $word . "_";             $length = mb_strlen($word, 'utf-8');             ($i = self::n_gram_min_length, $min =  min(self::n_gram_max_length, $length); $i <= $min; $i++) {                 ($j = 0, $li = $length - $i; $j <= $li; $j++) {                     $token = mb_substr($word, $j, $i, 'utf-8');                     if (trim($token, "_")) {                         $tokens[] = $token;                     }                    }             }         }         unset($word);         $tokens = array_count_values($tokens);         arsort($tokens);         $ngrams = array_slice(array_keys($tokens), 0);         file_put_contents(self::generated_directory . str_replace(self::source_extension, self::generated_extension, basename($file)), implode(php_eol, $ngrams));     }     unset($file); } } $ii = new ngram(); ?>

how make fast ? thanks

quickly searching 'how profile php' google led stackoverflow question: simplest way profile php script provides brief answer question.

not mention may find useful information here: http://www.php.net/apd http://www.xdebug.org/docs/profiler


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