通过google语音翻译把给定的文本生成音频文件

1. 音频demo

<?php
//mp3格式
echo "http://www.codepearl.com/files/212.html";

2.demo

<?php
/**
 * http://www.codepearl.com
 */
 
include 'PHP_Text2Speech.class.php';
 
$t2s = new PHP_Text2Speech;
 
?>
<audio controls="controls" autoplay="autoplay">
  <source src="<?php echo $t2s->speak('代码珠玑 ， 提供编程中 需要的各种工具类 ， 算法 ， 函数 ， 解决方案 ， 技术文档 ， 致力于做您最好的代码 ， 分享平台',"zh-CN"); ?>" type="audio/mp3" />
</audio>

3.操作类

<?php
//http://www.codepearl.com
/******************************************************************
Example:
<?php 
$t2s = new PHP_Text2Speech;
?>
  
// Simple example
<audio controls="controls" autoplay="autoplay">
  <source src="<?php echo $t2s->speak('www.codepearl.com','en'); ?>" type="audio/mp3" />
</audio>
  
// Example use of other language
<audio controls="controls" autoplay="autoplay">
  <source src="<?php echo $t2s->speak('代码珠玑', 'zh-CN'); ?>" type="audio/mp3" />
</audio>
  
******************************************************************/
  
class PHP_Text2Speech {
      
    /** Max text characters
     * @var Integer 
     */
    var $maxStrLen = 100;
      
    /** Text len
     * @var Integer 
     */
    var $textLen = 0;
      
    /** No of words
     * @var Integer 
     */
    var $wordCount = 0;
      
    /** Language of text (ISO 639-1)
     * @var String 
     * @link https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
     */
    var $lang = 'en';
      
    /** Text to speak
     * @var String 
     */
    var $text = NULL;
      
    /** File name format
     * @var String 
     */
    var $mp3File = "%s.mp3";
      
    /** Directory to store audio file
     * @var String 
     */
    var $audioDir = "audio/";
      
    /** Contents
    * @var  String
    */
    var $contents = NULL;
      
    /** Function make request to Google translate, download file and returns audio file path
     * @param   String  $text       - Text to speak
     * @param   String  $lang       - Language of text (ISO 639-1)
     * @return  String  - mp3 file path
     * @link https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
     */
    function speak($text, $lang = NULL) {
          
        if ($lang !== NULL) {
            $this->lang = $lang;
        }
          
        // Create dir if not exists
        if (!is_dir($this->audioDir)) {
            mkdir($this->audioDir, 0755) or die('Could not create audio dir: ' . $this->audioDir);
        }
          
        // Try to set writing permissions for audio dir.
        if (!is_writable($this->audioDir)) { 
            chmod($this->audioDir, 0755) or die('Could not set appropriate permissions for audio dir: ' . $this->audioDir);
        }
          
        // Can not handle more than 100 characters so split text
        if (strlen($text) > $this->maxStrLen) {
            $this->text = $text;
              
            // Generate unique mp3 file name
            $file = sprintf($this->mp3File, $this->audioDir . md5($this->text));
            if (!file_exists($file)) {
                $texts = array();
                $words = explode(' ', $this->text);
                $i = 0;
                $texts[$i] = NULL;
                foreach ($words as $w) {
                    $w = trim($w);
                    if (strlen($texts[$i] . ' ' . $w) < $this->maxStrLen) {
                        $texts[$i] = $texts[$i] . ' ' . $w; 
                    } else {
                        $texts[++$i] = $w;
                    }
                }
                  
                // Get get separated files contents and marge them into one
                foreach ($texts as $txt) {
                    $pFile = $this->speak($txt, $this->lang);
                    $this->contents .= $this->stripTags(file_get_contents($pFile));
                    unlink($pFile);
                }
                unset($words, $texts);
                  
                // Save file
                file_put_contents($file, $this->contents);
                $this->contents = NULL;
            }
        } else {
              
            // Generate unique mp3 file name
            $file = sprintf($this->mp3File, $this->audioDir . md5($text));
              
            if (!file_exists($file)) {
                // Text lenght
                $this->textLen = strlen($text);
                  
                // Words count
                $this->wordCount = str_word_count($text);
                  
                // Encode string
                $text = urlencode($text);
  
                // Download new file
                $this->download("http://translate.google.com/translate_tts?ie=UTF-8&q={$text}&tl={$this->lang}&total={$this->wordCount}&idx=0&textlen={$this->textLen}", $file);
            }
        }
          
        // Returns mp3 file path
        return $file;
    }
      
    /** Function to find the beginning of the mp3 file
     * @param   String  $contents       - File contents
     * @return  Integer
     */
    function getStart($contents) {
        for($i=0; $i < strlen($contents); $i++){
            if(ord(substr($contents, $i, 1)) == 255){
                return $i;
            }
        }
    }
      
    /** Function to find the end of the mp3 file
     * @param   String  $contents       - File contents
     * @return  Integer
     */
    function getEnd($contents) {
        $c = substr($contents, (strlen($contents) - 128));
        if(strtoupper(substr($c, 0, 3)) == 'TAG'){
            return $c;
        }else{
            return FALSE;
        }
    }
  
    /** Function to remove the ID3 tags from mp3 files
     * @param   String  $contents       - File contents
     * @return  String
     */
    function stripTags($contents) {
        // Remove start
        $start = $this->getStart($contents);
        if ($start === FALSE) {
            return FALSE;
        } else {
            return substr($contents, $start);
        }
        // Remove end tag
        if ($this->getEnd($contents) !== FALSE){
            return substr($contents, 0, (strlen($contents) - 129));
        }
    }
      
    /** Function to download and save file
     * @param   String  $url        - URL
     * @param   String  $path       - Local path
     */
    function download($url, $path) { 
        // Is curl installed?
        if (!function_exists('curl_init')){ // use file get contents 
            $output = file_get_contents($url); 
        }else{ // use curl 
            $ch = curl_init(); 
            curl_setopt($ch, CURLOPT_URL, $url); 
            curl_setopt($ch, CURLOPT_AUTOREFERER, true); 
            curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20041001 Firefox/0.10.1"); 
            curl_setopt($ch, CURLOPT_HEADER, 0); 
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
            curl_setopt($ch, CURLOPT_TIMEOUT, 10); 
            $output = curl_exec($ch); 
            curl_close($ch); 
        }
        // Save file
        file_put_contents($path, $output);
    }
}