How to count the number of words in a string in PHP ?

<?php
// PHP program to count number of
// words in a string 
  
$str = "  Geeks for Geeks  "; 
  
// Using str_word_count() function to
// count number of words in a string
$len = str_word_count($str);

// Printing the result
echo $len; 
?>

<?php
// PHP program to count number
// of words in a string 
  
// Function to count the words
function get_num_of_words($string) {
      $string = preg_replace('/\s+/', ' ', trim($string));
      $words = explode(" ", $string);
      return count($words);
}

$str = "  Geeks  for    Geeks  "; 
  
// Function call 
$len = get_num_of_words($str);

// Printing the result
echo $len; 
?>

<?php
// PHP program to count number
// of word in a string 
  
// Function to count the words
function get_num_of_words($string) {
    $str = trim($string);
      while (substr_count($str, "  ") > 0) {
        $str = str_replace("  ", " ", $str);
    }
      return substr_count($str, " ")+1;
}

$str = "  Geeks  for    Geeks  "; 
 
// Function call 
$len = get_num_of_words($str);

// Printing the result
echo $len; 
?>

<?php
function get_num_of_words($string) {
    // Trim leading and trailing whitespace
    $str = trim($string);
    
    // Initialize word count
    $wordCount = 0;
    
    // Tokenize the string by spaces
    $token = strtok($str, ' ');
    
    // Loop through each token
    while ($token !== false) {
        // Increment word count for each token
        $wordCount++;
        // Move to the next token
        $token = strtok(' ');
    }
    
    return $wordCount;
}

$str = "  Geeks  for    Geeks  "; 

// Function call 
$len = get_num_of_words($str);

// Printing the result
echo $len; 
?>

<?php
$string = "Hello World";
$wordCount = preg_match_all('/(\w+)/u', $string, $matches);


fwrite(STDOUT, $wordCount . PHP_EOL);
?>

<?php
$string = "   Hello    World   ";

// Step 1: Remove leading and trailing white spaces
$string = trim($string);

// Step 2: Split the string into an array of words
$wordsArray = explode(" ", $string);

// Step 3: Filter out empty elements
$wordsArray = array_filter($wordsArray);

// Step 4: Count the number of words
$numWords = count($wordsArray);

echo $numWords; // Output: 2 (for "Hello" and "World")

?>