PHP implements a method to calculate the frequency of words in a file or array

This article mainly introduces the method of calculating the frequency of words in files or arrays in PHP. It gives 2 examples of counting word frequencies, involving PHP regularization, array operations, string traversal and other related skills. Friends in need You can refer to the following

for details:

If it is a small file, it can be read into the array at once and use the convenient array counting function for word frequency statistics (assuming that the contents in the file are all separated by spaces) Open words):

<?php
$str = file_get_contents("/path/to/file.txt"); //get string from file
preg_match_all("/\b(\w+[-]\w+)|(\w+)\b/",$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 count
arsort($words); //order from high to low
print_r($words)

If it is a large file, it is not appropriate to read it into the memory. You can use the following method:

<?php
$filename = "/path/to/file.txt";
$handle = fopen($filename,"r");
if ($handle === false) {
 exit;
}
$word = "";
while (false !== ($letter = fgetc($handle))) {
 if ($letter == &#39; &#39;) {
  $results[$word]++;
  $word = "";
 }
 else {
  $word .= $letter;
 }
}
fclose($handle);
print_r($results);

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