log10 - PHP code example

PHP Function Log10

The php function log10 is used to calculate the logarithm of a number. The result of the logarithm will be a floating point value, or float(number). The function returns float(number) if the number is positive, and -Infinity if it is negative. The function is part of the math function and is a static method of the Math object.

The function accepts one compulsory parameter, which is the number whose logarithm is to be found. The function also accepts an optional base, which is the number to which the logarithm will be calculated. If the base is not given, it will be assumed to be M_E i.e the Euler’s number, which is a popular method to calculate logarithmic values.

The php function log10 allows developers to work with logarithmic functions, which are important in a number of online applications. The log function is a useful tool for any developer who needs to work with this type of data, as it is easy to use and can be utilized in a variety of ways. This article provides a guide on how to use the php function log10 in your own code, as well as some examples of how it is used in various online applications. In addition to this, the article discusses some tips on how to use this function in order to get the most out of it. These tips can help ensure that your log function is working properly and is giving you the results you need.

log10 example

  public function updateWordWeights(array $words) {
    try {
      // Update word IDF (Inverse Document Frequency) counts for new/changed       // words.       $words = array_keys($words);
      foreach ($words as $word) {
        // Get total count.         $total = $this->replica->query("SELECT SUM([score]) FROM {search_index} WHERE [word] = :word", [':word' => $word])
          ->fetchField();
        // Apply Zipf's law to equalize the probability distribution.         $total = log10(1 + 1 / (max(1, $total)));
        $this->connection->merge('search_total')
          ->key('word', $word)
          ->fields(['count' => $total])
          ->execute();
      }
      // Find words that were deleted from search_index, but are still in       // search_total. We use a LEFT JOIN between the two tables and keep only       // the rows which fail to join.       $result = $this->replica->query("SELECT [t].[word] AS [realword], [i].[word] FROM {search_total} [t] LEFT JOIN {search_index} [i] ON [t].[word] = [i].[word] WHERE [i].[word] IS NULL");
      $or = $this->replica->condition('OR');
      foreach ($result as $word) {

$gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);

        return $gainstring;
    }

    /** * @param float $amplitude * * @return float */
    public static function RGADamplitude2dB($amplitude) {
        return 20 * log10($amplitude);
    }

    /** * @param string $imgData * @param array $imageinfo * * @return array|false */
    public static function GetDataImageSize($imgData, &$imageinfo=array()) {
        if (PHP_VERSION_ID >= 50400) {
            $GetDataImageSize = @getimagesizefromstring($imgData, $imageinfo);

  public static function format($total, $current) {
    if (!$total || $total == $current) {
      // If $total doesn't evaluate as true or is equal to the current set, then       // we're finished, and we can return "100".       $percentage = '100';
    }
    else {
      // We add a new digit at 200, 2000, etc. (since, for example, 199/200       // would round up to 100% if we didn't).       $decimal_places = max(0, floor(log10($total / 2.0)) - 1);
      do {
        // Calculate the percentage to the specified number of decimal places.         $percentage = sprintf('%01.' . $decimal_places . 'f', round($current / $total * 100, $decimal_places));
        // When $current is an integer, the above calculation will always be         // correct. However, if $current is a floating point number (in the case         // of a multi-step batch operation that is not yet complete), $percentage         // may be erroneously rounded up to 100%. To prevent that, we add one         // more decimal place and try again.         $decimal_places++;
      } while ($percentage == '100');
    }

/** * Default topic count scaling for tag links. * * @since 2.9.0 * * @param int $count Number of posts with that tag. * @return int Scaled count. */
function default_topic_count_scale( $count ) {
return round( log10( $count + 1 ) * 100 );
}

/** * Generates a tag cloud (heatmap) from provided data. * * @todo Complete functionality. * @since 2.3.0 * @since 4.8.0 Added the `show_count` argument. * * @param WP_Term[] $tags Array of WP_Term objects to generate the tag cloud for. * @param string|array $args { * Optional. Array or string of arguments for generating a tag cloud. * * @type int $smallest Smallest font size used to display tags. Paired * with the value of `$unit`, to determine CSS text * size unit. Default 8 (pt). * @type int $largest Largest font size used to display tags. Paired * with the value of `$unit`, to determine CSS text * size unit. Default 22 (pt). * @type string $unit CSS text size unit to use with the `$smallest` * and `$largest` values. Accepts any valid CSS text * size unit. Default 'pt'. * @type int $number The number of tags to return. Accepts any * positive integer or zero to return all. * Default 0. * @type string $format Format to display the tag cloud in. Accepts 'flat' * (tags separated with spaces), 'list' (tags displayed * in an unordered list), or 'array' (returns an array). * Default 'flat'. * @type string $separator HTML or text to separate the tags. Default "\n" (newline). * @type string $orderby Value to order tags by. Accepts 'name' or 'count'. * Default 'name'. The {@see 'tag_cloud_sort'} filter * can also affect how tags are sorted. * @type string $order How to order the tags. Accepts 'ASC' (ascending), * 'DESC' (descending), or 'RAND' (random). Default 'ASC'. * @type int|bool $filter Whether to enable filtering of the final output * via {@see 'wp_generate_tag_cloud'}. Default 1. * @type array $topic_count_text Nooped plural text from _n_noop() to supply to * tag counts. Default null. * @type callable $topic_count_text_callback Callback used to generate nooped plural text for * tag counts based on the count. Default null. * @type callable $topic_count_scale_callback Callback used to determine the tag count scaling * value. Default default_topic_count_scale(). * @type bool|int $show_count Whether to display the tag counts. Default 0. Accepts * 0, 1, or their bool equivalents. * } * @return string|string[] Tag cloud as a string or an array, depending on 'format' argument. */