/**
 * PHP實(shí)現(xiàn)文字寫(xiě)入圖片
 */
class wordsOnImg {
 
  public $config = null;
 
  /**
   * @param $config 傳入?yún)?shù)
   * @param $config['file'] 圖片文件
   * @param $config['size'] 文字大小
   * @param $config['angle'] 文字的水平角度
   * @param $config['fontfile'] 字體文件路徑
   * @param $config['width'] 預(yù)先設(shè)置的寬度
   * @param $config['x'] 開(kāi)始寫(xiě)入時(shí)的橫坐標(biāo)
   * @param $config['y'] 開(kāi)始寫(xiě)入時(shí)的縱坐標(biāo)
   */
  public function __construct($config=null){
    if(empty($config)){
      return 'must be config';
    }
    $fileArr = explode(".",$config['file']);
    $config['file_name'] = $fileArr[0];
    $config['file_ext'] = $fileArr[1];
    $this->config = $config;
  }
  /**
   * PHP實(shí)現(xiàn)圖片上寫(xiě)入實(shí)現(xiàn)文字自動(dòng)換行
   * @param $fontsize 字體大小
   * @param $angle 角度
   * @param $font 字體路徑
   * @param $string 要寫(xiě)在圖片上的文字
   * @param $width 預(yù)先設(shè)置圖片上文字的寬度
   * @param $flag  換行時(shí)單詞不折行
   */
  public function wordWrap($fontsize,$angle,$font,$string,$width,$flag=true) {
    $content = "";
    if($flag){
      $words = explode(" ",$string);
      foreach ($words as $key=>$value) {
        $teststr = $content." ".$value;
        $testbox = imagettfbbox($fontsize, $angle, $font, $teststr);
        //判斷拼接后的字符串是否超過(guò)預(yù)設(shè)的寬度
        if(($testbox[2] > $width)) {
          $content .= "\n";
        }
        $content .= $value." ";
      }
    }else{
      //將字符串拆分成一個(gè)個(gè)單字 保存到數(shù)組 letter 中
      for ($i=0;$i<mb_strlen($string);$i++) {
        $letter[] = mb_substr($string, $i, 1);
      }
      foreach ($letter as $l) {
        $teststr = $content." ".$l;
        $testbox = imagettfbbox($fontsize, $angle, $font, $teststr);
        // 判斷拼接后的字符串是否超過(guò)預(yù)設(shè)的寬度
        if (($testbox[2] > $width) && ($content !== "")) {
          $content .= "\n";
        }
        $content .= $l;
      }
    }
    return $content;
  }
 
  /**
   * 實(shí)現(xiàn)寫(xiě)入圖片
   * @param $text 要寫(xiě)入的文字
   * @param $flag 是否直接輸出到瀏覽器，默認(rèn)是
   */
  public function writeWordsToImg($text,$flag=true){
    if(empty($this->config)){
      return 'must be config';
    }
    //獲取圖片大小
    $img_pathWH = getimagesize($this->config['file']);
    //打開(kāi)指定的圖片文件
    $im = imagecreatefrompng($this->config['file']);
    #設(shè)置水印字體顏色
    $color = imagecolorallocatealpha($im,0, 0, 255, 75);//藍(lán)色
    $have = false;
    if(stripos($text,"<br/>")!== false){
      $have = true;
    }
    if($have){
      $words_text = explode("<br/>",$text);
      $words_text[0] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[0], $this->config['width']); //自動(dòng)換行處理
      $words_text[1] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[1], $this->config['width']); //自動(dòng)換行處理
      $words_text[2] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[2], $this->config['width']); //自動(dòng)換行處理
      imagettftext($im, $this->config['size'], $this->config['angle'], $this->config['x'], $this->config['y'], $color, $this->config['fontfile'], $words_text[0]);
      imagettftext($im, $this->config['size'], $this->config['angle'], $this->config['x'], $this->config['y']+30, $color, $this->config['fontfile'], "  ".$words_text[1]);
      imagettftext($im, $this->config['size'], $this->config['angle'], $img_pathWH[0]/2+70, $img_pathWH[1]-80, $color, $this->config['fontfile'], $words_text[2]);
      if($flag){
        header("content-type:image/png");
        imagepng($im);
        imagedestroy($im);
      }
      imagepng($im,$this->config['file_name'].'_1.'.$this->config['file_ext']);
      imagedestroy($im);
    }
    $words_text = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $text, $this->config['width']); //自動(dòng)換行處理
    imagettftext($im, $this->config['size'], $this->config['angle'], $this->config['x'], $this->config['y'], $color, $this->config['fontfile'], $words_text);
    if($flag){
      header("content-type:image/png");
      imagepng($im);
      imagedestroy($im);
    }
    imagepng($im,$this->config['file_name'].'_1.'.$this->config['file_ext']);
    imagedestroy($im);
  }
}
 
$text = "Dear Kang<br/>If you can hold something up and put it down, it is called weight lifting;if you can hold something up but can never put it down, it's called bueden bearing. Pitifully, most of people are bearing heavy burdens when they are in love.\n\nBeing nice to someone you dislike doesn't mean you're a hypocritical people. It means you're mature enough to tolerate your dislike towards them.<br/>Mr. Kang";
 
$data = array(
  'file'=>'20171226152410.png',
  'size'=>12,
  'angle'=>0,
  'fontfile'=>'./Font/ChalkboardSE.ttc',
  'width'=>270,
  'x'=>20,
  'y'=>70
);
//使用
$wordsOnImgObj = new wordsOnImg($data);
$wordsOnImgObj->writeWordsToImg($text);