PHP编程计算文件或数组中单词出现频率的方法

<?php$str = file_get_contents("/path/to/file.txt"); //get string from filepreg_match_all("//b(/w+[-]/w+)|(/w+)/b/",$str,$r); //place words into array $r - this includes hyphenated words$words = array_count_values(array_map("strtolower",$r[0])); //create new array - with case-insensitive countarsort($words); //order from high to lowprint_r($words)

<?php$filename = "/path/to/file.txt";$handle = fopen($filename,"r");if ($handle === false) { exit;}$word = "";while (false !== ($letter = fgetc($handle))) { if ($letter == ' ') {  $results[$word]++;  $word = ""; } else {  $word .= $letter; }}fclose($handle);print_r($results);