PHP实现文字写入图片功能

本文实例为大家分享了PHP实现文字写入图片的具体代码，供大家参考，具体内容如下

class wordsonImg {
 
  public $config = null;
 
  
  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;
  }
  
  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, $teststr);
 //判断拼接后的字符串是否超过预设的宽度
 if(($testbox[2] > $width)) {
   $content .= "n";
 }
 $content .= $value." ";
      }
    }else{
      //将字符串拆分成一个个单字 保存到数组 letter 中
      for ($i=0;$i $width) && ($content !== "")) {
   $content .= "n";
 }
 $content .= $l;
      }
    }
    return $content;
  }
 
  
  public function writeWordsToImg($text,$flag=true){
    if(empty($this->config)){
      return 'must be config';
    }
    //获取图片大小
    $img_pathWH = getimagesize($this->config['file']);
    //打开指定的图片文件
    $im = imagecreatefrompng($this->config['file']);
    #设置水印字体颜色
    $color = imagecolorallocatealpha($im,0, 0, 255, 75);//蓝色
    $have = false;
    if(stripos($text,"
")!== false){
      $have = true;
    }
    if($have){
      $words_text = explode("
",$text);
      $words_text[0] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[0], $this->config['width']); //自动换行处理
      $words_text[1] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[1], $this->config['width']); //自动换行处理
      $words_text[2] = $this->wordWrap($this->config['size'], $this->config['angle'], $this->config['fontfile'], $words_text[2], $this->config['width']); //自动换行处理
      imagettftext($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, $this->config['width']); //自动换行处理
    imagettftext($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
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.nnBeing 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.
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内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。