PHP實現文字寫入圖片功能

這篇文章主要爲大家詳細介紹了PHP實現文字寫入圖片功能，具有一定的參考價值，感興趣的小夥伴們可以參考一下

本文實例爲大家分享了PHP實現文字寫入圖片的具體代碼，供大家參考，具體內容如下

/**
 * PHP實現文字寫入圖片
 */
class wordsOnImg {
 
  public $config = null;
 
  /**
   * @param $config 傳入參數
   * @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'] 預先設置的寬度
   * @param $config['x'] 開始寫入時的橫座標
   * @param $config['y'] 開始寫入時的縱座標
   */
  public function __construct($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實現圖片上寫入實現文字自動換行
   * @param $fontsize 字體大小
   * @param $angle 角度
   * @param $font 字體路徑
   * @param $string 要寫在圖片上的文字
   * @param $width 預先設置圖片上文字的寬度
   * @param $flag  換行時單詞不折行
   */
  public function wordWrap($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, $teststr);
        //判斷拼接後的字符串是否超過預設的寬度
        if(($testbox[2] > $width)) {
          $content .= "\n";
        }
        $content .= $value." ";
      }
    }else{
      //將字符串拆分成一個個單字 保存到數組 letter 中
      for ($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, $teststr);
        // 判斷拼接後的字符串是否超過預設的寬度
        if (($testbox[2] > $width) && ($content !== "")) {
          $content .= "\n";
        }
        $content .= $l;
      }
    }
    return $content;
  }
 
  /**
   * 實現寫入圖片
   * @param $text 要寫入的文字
   * @param $flag 是否直接輸出到瀏覽器，默認是
   */
  public function writeWordsToImg($text,$flag=true){
    if(empty($this->config)){
      return 'must be config';
    }
    //獲取圖片大小
    $img_pathWH = getimagesize($this->config['file']);
    //打開指定的圖片文件
    $im = imagecreatefrompng($this->config['file']);
    #設置水印字體顏色
    $color = imagecolorallocatealpha($im,0, 0, 255, 75);//藍色
    $have = false;
    if(stripos($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);

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持神馬文庫。