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<?php |
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namespace DaveChild\TextStatistics; |
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/* |
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TextStatistics Project |
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https://github.com/DaveChild/Text-Statistics |
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Released under New BSD license |
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http://www.opensource.org/licenses/bsd-license.php |
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Calculates following readability scores (formulae can be found in Wikipedia): |
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* Flesch Kincaid Reading Ease |
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* Flesch Kincaid Grade Level |
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* Gunning Fog Score |
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* Coleman Liau Index |
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* SMOG Index |
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* Automated Reability Index |
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* Dale-Chall Readability Score |
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* Spache Readability Score |
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Will also give: |
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* String length |
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* Letter count |
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* Syllable count |
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* Sentence count |
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* Average words per sentence |
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* Average syllables per word |
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Sample Code |
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---------------- |
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$statistics = new DaveChild\TextStatistics\TextStatistics; |
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$text = 'The quick brown fox jumped over the lazy dog.'; |
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echo 'Flesch-Kincaid Reading Ease: ' . $statistics->flesch_kincaid_reading_ease($text); |
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*/ |
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class TextStatistics |
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{ |
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/** |
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* @var string $strEncoding Used to hold character encoding to be used |
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* by object, if set |
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*/ |
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protected $strEncoding = ''; |
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/** |
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* @var Maximum grade level to be reported. Calculated grades above |
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* this level will be returned as this value. |
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*/ |
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protected $maxGradeLevel = 12; |
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/** |
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* @var bool $normalise Should the result be normalised? |
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*/ |
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public $normalise = true; |
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/** |
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* @var int $dps How many decimal places should results be given to? |
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*/ |
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public $dps = 1; |
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/** |
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* @var string $strText Holds the last text checked. If no text passed to |
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* function, it will use this text instead. |
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*/ |
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private static $strText = false; |
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/** |
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* Constructor. |
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* |
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* @param string $strEncoding Optional character encoding. |
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* @return void |
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*/ |
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public function __construct($strEncoding = '') |
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{ |
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if ($strEncoding != '') { |
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// Encoding is given. Use it! |
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$this->strEncoding = $strEncoding; |
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} |
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} |
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38 |
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/** |
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* Set the text to measure the readability of. |
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* @param string|boolean $strText Text to be checked |
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* @return string Cleaned text |
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*/ |
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public function setText($strText) |
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{ |
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// If text passed in, clean it up and store it for subsequent queries |
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if ($strText !== false) { |
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self::$strText = Text::cleanText($strText); |
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} |
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return self::$strText; |
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} |
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/** |
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* Set the encoding of the text being measured. |
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* @param string $strEncoding New encoding |
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* @return boolean |
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*/ |
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public function setEncoding($strEncoding) |
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{ |
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$this->strEncoding = $strEncoding; |
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return true; |
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} |
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/** |
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* Set the maximum grade level for grade-level type indexes |
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* (Flesch-Kincaid Grade Level, Gunning-Fog, Coleman-Liau, SMOG, Automated Readability) |
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* @param integer $maxGradeLevel Grade level to use |
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* @return boolean Success |
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*/ |
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public function setMaxGradeLevel($maxGradeLevel) |
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{ |
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$maxGradeLevel = (integer) $maxGradeLevel; |
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if( $maxGradeLevel ) |
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{ |
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$this->maxGradeLevel = $maxGradeLevel; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Gives the Flesch-Kincaid Reading Ease of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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View Code Duplication |
public function fleschKincaidReadingEase($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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Maths::bcCalc( |
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206.835, |
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'-', |
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Maths::bcCalc( |
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1.015, |
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'*', |
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Text::averageWordsPerSentence($strText, $this->strEncoding) |
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) |
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), |
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'-', |
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Maths::bcCalc( |
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84.6, |
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'*', |
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Syllables::averageSyllablesPerWord($strText, $this->strEncoding) |
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) |
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); |
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if ($this->normalise) { |
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return Maths::normaliseScore($score, 0, 100, $this->dps); |
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} else { |
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return Maths::bcCalc($score, '+', 0, true, $this->dps); |
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} |
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} |
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/** |
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* Gives the Flesch-Kincaid Grade level of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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View Code Duplication |
public function fleschKincaidGradeLevel($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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Maths::bcCalc( |
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0.39, |
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'*', |
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Text::averageWordsPerSentence($strText, $this->strEncoding) |
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), |
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'+', |
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Maths::bcCalc( |
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Maths::bcCalc( |
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11.8, |
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'*', |
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Syllables::averageSyllablesPerWord($strText, $this->strEncoding) |
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), |
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'-', |
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15.59 |
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) |
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); |
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if ($this->normalise) { |
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return Maths::normaliseScore($score, 0, $this->maxGradeLevel, $this->dps); |
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} else { |
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return Maths::bcCalc($score, '+', 0, true, $this->dps); |
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} |
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} |
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/** |
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* Gives the Gunning-Fog score of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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public function gunningFogScore($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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Maths::bcCalc( |
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Text::averageWordsPerSentence($strText, $this->strEncoding), |
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'+', |
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Syllables::percentageWordsWithThreeSyllables($strText, false, $this->strEncoding) |
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), |
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'*', |
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'0.4' |
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); |
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if ($this->normalise) { |
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return Maths::normaliseScore($score, 0, 19, $this->dps); |
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} else { |
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return Maths::bcCalc($score, '+', 0, true, $this->dps); |
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} |
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} |
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/** |
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* Gives the Coleman-Liau Index of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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View Code Duplication |
public function colemanLiauIndex($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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Maths::bcCalc( |
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Maths::bcCalc( |
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5.89, |
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'*', |
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Maths::bcCalc( |
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Text::letterCount($strText, $this->strEncoding), |
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'/', |
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Text::wordCount($strText, $this->strEncoding) |
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) |
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), |
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'-', |
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Maths::bcCalc( |
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0.3, |
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'*', |
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Maths::bcCalc( |
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Text::sentenceCount($strText, $this->strEncoding), |
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'/', |
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Text::wordCount($strText, $this->strEncoding) |
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) |
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) |
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), |
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'-', |
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15.8 |
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); |
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if ($this->normalise) { |
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return Maths::normaliseScore($score, 0, $this->maxGradeLevel, $this->dps); |
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} else { |
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return Maths::bcCalc($score, '+', 0, true, $this->dps); |
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} |
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} |
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/** |
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* Gives the SMOG Index of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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View Code Duplication |
public function smogIndex($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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1.043, |
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'*', |
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Maths::bcCalc( |
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Maths::bcCalc( |
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Maths::bcCalc( |
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Syllables::wordsWithThreeSyllables($strText, true, $this->strEncoding), |
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'*', |
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Maths::bcCalc( |
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30, |
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'/', |
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Text::sentenceCount($strText, $this->strEncoding) |
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) |
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), |
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'sqrt', |
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0 |
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), |
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'+', |
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3.1291 |
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) |
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); |
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if ($this->normalise) { |
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return Maths::normaliseScore($score, 0, $this->maxGradeLevel, $this->dps); |
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} else { |
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return Maths::bcCalc($score, '+', 0, true, $this->dps); |
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} |
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} |
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/** |
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* Gives the Automated Readability Index of text entered rounded to one digit |
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* @param boolean|string $strText Text to be checked |
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* @return int|float |
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*/ |
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View Code Duplication |
public function automatedReadabilityIndex($strText = false) |
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{ |
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$strText = $this->setText($strText); |
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$score = Maths::bcCalc( |
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Maths::bcCalc( |
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4.71, |
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'*', |
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Maths::bcCalc( |
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Text::letterCount($strText, $this->strEncoding), |
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3 |
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'/', |
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Text::wordCount($strText, $this->strEncoding) |
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) |
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), |
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'+', |
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Maths::bcCalc( |
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Maths::bcCalc( |
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0.5, |
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'*', |
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Maths::bcCalc( |
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Text::wordCount($strText, $this->strEncoding), |
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'/', |
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Text::sentenceCount($strText, $this->strEncoding) |
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) |
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), |
|
331
|
|
|
'-', |
|
332
|
|
|
21.43 |
|
333
|
|
|
) |
|
334
|
|
|
); |
|
335
|
|
|
|
|
336
|
|
|
if ($this->normalise) { |
|
337
|
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|
return Maths::normaliseScore($score, 0, $this->maxGradeLevel, $this->dps); |
|
338
|
|
|
} else { |
|
339
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|
return Maths::bcCalc($score, '+', 0, true, $this->dps); |
|
340
|
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} |
|
341
|
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} |
|
342
|
|
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|
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343
|
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|
/** |
|
344
|
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|
* Gives the Dale-Chall readability score of text entered rounded to one digit |
|
345
|
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|
* @param boolean|string $strText Text to be checked |
|
346
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* @return int|float |
|
347
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*/ |
|
348
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|
View Code Duplication |
public function daleChallReadabilityScore($strText = false) |
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349
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{ |
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350
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$strText = $this->setText($strText); |
|
351
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|
|
352
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|
$score = Maths::bcCalc( |
|
353
|
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|
Maths::bcCalc( |
|
354
|
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|
0.1579, |
|
355
|
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|
'*', |
|
356
|
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|
Maths::bcCalc( |
|
357
|
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100, |
|
358
|
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|
'*', |
|
359
|
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|
Maths::bcCalc( |
|
360
|
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|
$this->daleChallDifficultWordCount($strText), |
|
361
|
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'/', |
|
362
|
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Text::wordCount($strText, $this->strEncoding) |
|
363
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|
) |
|
364
|
|
|
) |
|
365
|
|
|
), |
|
366
|
|
|
'+', |
|
367
|
|
|
Maths::bcCalc( |
|
368
|
|
|
0.0496, |
|
369
|
|
|
'*', |
|
370
|
|
|
Maths::bcCalc( |
|
371
|
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|
Text::wordCount($strText, $this->strEncoding), |
|
372
|
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|
'/', |
|
373
|
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|
Text::sentenceCount($strText, $this->strEncoding) |
|
374
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) |
|
375
|
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) |
|
376
|
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); |
|
377
|
|
|
|
|
378
|
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|
if ($this->normalise) { |
|
379
|
|
|
return Maths::normaliseScore($score, 0, 10, $this->dps); |
|
380
|
|
|
} else { |
|
381
|
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|
return Maths::bcCalc($score, '+', 0, true, $this->dps); |
|
382
|
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|
} |
|
383
|
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|
} |
|
384
|
|
|
|
|
385
|
|
|
/** |
|
386
|
|
|
* Gives the Spache readability score of text entered rounded to one digit |
|
387
|
|
|
* @param boolean|string $strText Text to be checked |
|
388
|
|
|
* @return int|float |
|
389
|
|
|
*/ |
|
390
|
|
View Code Duplication |
public function spacheReadabilityScore($strText = false) |
|
|
|
|
|
|
391
|
|
|
{ |
|
392
|
|
|
$strText = $this->setText($strText); |
|
393
|
|
|
|
|
394
|
|
|
$score = Maths::bcCalc( |
|
395
|
|
|
Maths::bcCalc( |
|
396
|
|
|
Maths::bcCalc( |
|
397
|
|
|
0.121, |
|
398
|
|
|
'*', |
|
399
|
|
|
Maths::bcCalc( |
|
400
|
|
|
Text::wordCount($strText, $this->strEncoding), |
|
401
|
|
|
'/', |
|
402
|
|
|
Text::sentenceCount($strText, $this->strEncoding) |
|
403
|
|
|
) |
|
404
|
|
|
), |
|
405
|
|
|
'+', |
|
406
|
|
|
Maths::bcCalc( |
|
407
|
|
|
0.082, |
|
408
|
|
|
'*', |
|
409
|
|
|
$this->spacheDifficultWordCount($strText) |
|
410
|
|
|
) |
|
411
|
|
|
), |
|
412
|
|
|
'+', |
|
413
|
|
|
0.659 |
|
414
|
|
|
); |
|
415
|
|
|
|
|
416
|
|
|
if ($this->normalise) { |
|
417
|
|
|
return Maths::normaliseScore($score, 0, 5, $this->dps); // Not really suitable for measuring readability above grade 4 |
|
418
|
|
|
} else { |
|
419
|
|
|
return Maths::bcCalc($score, '+', 0, true, $this->dps); |
|
420
|
|
|
} |
|
421
|
|
|
} |
|
422
|
|
|
|
|
423
|
|
|
/** |
|
424
|
|
|
* Returns the number of words NOT on the Dale-Chall easy word list |
|
425
|
|
|
* @param boolean|string $strText Text to be measured |
|
426
|
|
|
* @return int |
|
427
|
|
|
*/ |
|
428
|
|
|
public function daleChallDifficultWordCount($strText = false) |
|
429
|
|
|
{ |
|
430
|
|
|
$strText = $this->setText($strText); |
|
431
|
|
|
$intDifficultWords = 0; |
|
432
|
|
|
$arrWords = explode(' ', Text::lowerCase(preg_replace('`[^A-za-z\' ]`', '', $strText), $this->strEncoding)); |
|
433
|
|
|
|
|
434
|
|
|
// Fetch Dale-Chall Words |
|
435
|
|
|
$arrDaleChall = Resource::fetchDaleChallWordList(); |
|
436
|
|
|
|
|
437
|
|
|
for ($i = 0, $intWordCount = count($arrWords); $i < $intWordCount; $i++) { |
|
438
|
|
|
// Single letters are counted as easy |
|
439
|
|
|
if (strlen(trim($arrWords[$i])) < 2) { |
|
440
|
|
|
continue; |
|
441
|
|
|
} |
|
442
|
|
|
if ((!in_array(Pluralise::getPlural($arrWords[$i]), $arrDaleChall)) && (!in_array(Pluralise::getSingular($arrWords[$i]), $arrDaleChall))) { |
|
443
|
|
|
$intDifficultWords++; |
|
444
|
|
|
} |
|
445
|
|
|
} |
|
446
|
|
|
|
|
447
|
|
|
return $intDifficultWords; |
|
448
|
|
|
} |
|
449
|
|
|
|
|
450
|
|
|
/** |
|
451
|
|
|
* Returns the number of unique words NOT on the Spache easy word list |
|
452
|
|
|
* @param boolean|string $strText Text to be measured |
|
453
|
|
|
* @return int |
|
454
|
|
|
*/ |
|
455
|
|
|
public function spacheDifficultWordCount($strText = false) |
|
456
|
|
|
{ |
|
457
|
|
|
$strText = $this->setText($strText); |
|
458
|
|
|
$intDifficultWords = 0; |
|
459
|
|
|
$arrWords = explode(' ', strtolower(preg_replace('`[^A-za-z\' ]`', '', $strText))); |
|
460
|
|
|
// Fetch Spache Words |
|
461
|
|
|
$wordsCounted = array(); |
|
462
|
|
|
|
|
463
|
|
|
// Get the Spache word list |
|
464
|
|
|
$arrSpache = Resource::fetchSpacheWordList(); |
|
465
|
4 |
|
|
|
466
|
|
|
for ($i = 0, $intWordCount = count($arrWords); $i < $intWordCount; $i++) { |
|
467
|
4 |
|
// Single letters are counted as easy |
|
468
|
|
|
if (strlen(trim($arrWords[$i])) < 2) { |
|
469
|
4 |
|
continue; |
|
470
|
|
|
} |
|
471
|
|
|
$singularWord = Pluralise::getSingular($arrWords[$i]); |
|
472
|
|
|
if ((!in_array(Pluralise::getPlural($arrWords[$i]), $arrSpache)) && (!in_array($singularWord, $arrSpache))) { |
|
473
|
|
|
if (!in_array($singularWord, $wordsCounted)) { |
|
474
|
|
|
$intDifficultWords++; |
|
475
|
|
|
$wordsCounted[] = $singularWord; |
|
476
|
|
|
} |
|
477
|
3 |
|
} |
|
478
|
|
|
} |
|
479
|
3 |
|
|
|
480
|
|
|
return $intDifficultWords; |
|
481
|
3 |
|
} |
|
482
|
|
|
|
|
483
|
|
|
/** |
|
484
|
|
|
* Returns letter count for text. |
|
485
|
|
|
* @param boolean|string $strText Text to be measured |
|
486
|
|
|
* @return int |
|
487
|
|
|
*/ |
|
488
|
|
|
public function letterCount($strText = false) |
|
489
|
3 |
|
{ |
|
490
|
|
|
$strText = $this->setText($strText); |
|
491
|
3 |
|
|
|
492
|
|
|
return Text::letterCount($strText, $this->strEncoding); |
|
493
|
3 |
|
} |
|
494
|
|
|
|
|
495
|
|
|
/** |
|
496
|
|
|
* Returns sentence count for text. |
|
497
|
|
|
* @param boolean|string $strText Text to be measured |
|
498
|
|
|
* @return int |
|
499
|
|
|
*/ |
|
500
|
|
|
public function sentenceCount($strText = false) |
|
501
|
1 |
|
{ |
|
502
|
|
|
$strText = $this->setText($strText); |
|
503
|
1 |
|
|
|
504
|
|
|
return Text::sentenceCount($strText, $this->strEncoding); |
|
505
|
1 |
|
} |
|
506
|
|
|
|
|
507
|
|
|
/** |
|
508
|
|
|
* Returns word count for text. |
|
509
|
|
|
* @param boolean|string $strText Text to be measured |
|
510
|
|
|
* @return int |
|
511
|
|
|
*/ |
|
512
|
|
|
public function wordCount($strText = false) |
|
513
|
5 |
|
{ |
|
514
|
|
|
$strText = $this->setText($strText); |
|
515
|
5 |
|
|
|
516
|
|
|
return Text::wordCount($strText, $this->strEncoding); |
|
517
|
5 |
|
} |
|
518
|
|
|
|
|
519
|
|
|
/** |
|
520
|
|
|
* Returns average words per sentence for text. |
|
521
|
|
|
* @param boolean|string $strText Text to be measured |
|
522
|
|
|
* @return int|float |
|
523
|
|
|
*/ |
|
524
|
|
|
public function averageWordsPerSentence($strText = false) |
|
525
|
1 |
|
{ |
|
526
|
|
|
$strText = $this->setText($strText); |
|
527
|
1 |
|
|
|
528
|
|
|
return Text::averageWordsPerSentence($strText, $this->strEncoding); |
|
529
|
1 |
|
} |
|
530
|
|
|
|
|
531
|
|
|
/** |
|
532
|
|
|
* Returns number of syllables in a word |
|
533
|
|
|
* @param boolean|string $strText Text to be measured |
|
534
|
|
|
* @return int |
|
535
|
|
|
*/ |
|
536
|
|
|
public function syllableCount($strText = false) |
|
537
|
1 |
|
{ |
|
538
|
|
|
$strText = $this->setText($strText); |
|
539
|
1 |
|
|
|
540
|
|
|
return Syllables::syllableCount($strText, $this->strEncoding); |
|
541
|
1 |
|
} |
|
542
|
|
|
|
|
543
|
|
|
/** |
|
544
|
|
|
* Returns total syllable count for text. |
|
545
|
|
|
* @param boolean|string $strText Text to be measured |
|
546
|
|
|
* @return int |
|
547
|
|
|
*/ |
|
548
|
|
|
public function totalSyllables($strText = false) |
|
549
|
|
|
{ |
|
550
|
1 |
|
$strText = $this->setText($strText); |
|
551
|
|
|
|
|
552
|
1 |
|
return Syllables::totalSyllables($strText, $this->strEncoding); |
|
553
|
|
|
} |
|
554
|
1 |
|
|
|
555
|
|
|
/** |
|
556
|
|
|
* Returns average syllables per word for text. |
|
557
|
|
|
* @param boolean|string $strText Text to be measured |
|
558
|
|
|
* @return int|float |
|
559
|
|
|
*/ |
|
560
|
|
|
public function averageSyllablesPerWord($strText = false) |
|
561
|
|
|
{ |
|
562
|
|
|
$strText = $this->setText($strText); |
|
563
|
1 |
|
|
|
564
|
|
|
return Syllables::averageSyllablesPerWord($strText, $this->strEncoding); |
|
565
|
1 |
|
} |
|
566
|
|
|
|
|
567
|
1 |
|
/** |
|
568
|
|
|
* Returns the number of words with more than three syllables |
|
569
|
|
|
* @param boolean|string $strText Text to be measured |
|
570
|
|
|
* @param bool $blnCountProperNouns Boolean - should proper nouns be included in words count |
|
571
|
|
|
* @return int |
|
572
|
|
|
*/ |
|
573
|
|
|
public function wordsWithThreeSyllables($strText = false, $blnCountProperNouns = true) |
|
574
|
3 |
|
{ |
|
575
|
|
|
$strText = $this->setText($strText); |
|
576
|
3 |
|
|
|
577
|
|
|
return Syllables::wordsWithThreeSyllables($strText, $blnCountProperNouns, $this->strEncoding); |
|
578
|
|
|
} |
|
579
|
3 |
|
|
|
580
|
|
|
/** |
|
581
|
3 |
|
* Returns the percentage of words with more than three syllables |
|
582
|
|
|
* @param boolean|string $strText Text to be measured |
|
583
|
|
|
* @param bool $blnCountProperNouns Boolean - should proper nouns be included in words count |
|
584
|
3 |
|
* @return int|float |
|
585
|
|
|
*/ |
|
586
|
3 |
|
public function percentageWordsWithThreeSyllables($strText = false, $blnCountProperNouns = true) |
|
587
|
|
|
{ |
|
588
|
|
|
$strText = $this->setText($strText); |
|
589
|
3 |
|
|
|
590
|
|
|
return Syllables::percentageWordsWithThreeSyllables($strText, $blnCountProperNouns, $this->strEncoding); |
|
591
|
3 |
|
} |
|
592
|
|
|
|
|
593
|
|
|
/** |
|
594
|
3 |
|
* We switched to camel-case but we'll leave these aliases in for |
|
595
|
|
|
* convenience for anyone switching from the previous version. |
|
596
|
3 |
|
*/ |
|
597
|
|
|
public function flesch_kincaid_reading_ease($strText = false) |
|
598
|
|
|
{ |
|
599
|
3 |
|
return $this->fleschKincaidReadingEase($strText); |
|
600
|
|
|
} |
|
601
|
3 |
|
|
|
602
|
|
|
public function flesch_kincaid_grade_level($strText = false) |
|
603
|
|
|
{ |
|
604
|
|
|
return $this->fleschKincaidGradeLevel($strText); |
|
605
|
|
|
} |
|
606
|
|
|
|
|
607
|
|
|
public function gunning_fog_score($strText = false) |
|
608
|
|
|
{ |
|
609
|
|
|
return $this->gunningFogScore($strText); |
|
610
|
|
|
} |
|
611
|
|
|
|
|
612
|
|
|
public function coleman_liau_index($strText = false) |
|
613
|
|
|
{ |
|
614
|
|
|
return $this->colemanLiauIndex($strText); |
|
615
|
|
|
} |
|
616
|
|
|
|
|
617
|
|
|
public function smog_index($strText = false) |
|
618
|
|
|
{ |
|
619
|
|
|
return $this->smogIndex($strText); |
|
620
|
|
|
} |
|
621
|
|
|
|
|
622
|
|
|
public function automated_readability_index($strText = false) |
|
623
|
|
|
{ |
|
624
|
|
|
return $this->automatedReadabilityIndex($strText); |
|
625
|
|
|
} |
|
626
|
|
|
|
|
627
|
|
|
public function dale_chall_readability_score($strText = false) |
|
628
|
|
|
{ |
|
629
|
|
|
return $this->daleChallReadabilityScore($strText); |
|
630
|
|
|
} |
|
631
|
|
|
|
|
632
|
|
|
public function spache_readability_score($strText = false) |
|
633
|
|
|
{ |
|
634
|
|
|
return $this->spacheReadabilityScore($strText); |
|
635
|
|
|
} |
|
636
|
|
|
} |
|
637
|
|
|
|
Adding a
@returnannotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.