PHP图片文字水印效果

超硬核！直播聊聊工业软件的 “中国心”

废话不多说，直接上代码，一贯作风不写注释 

<?php
class WaterMark
{
	private $dest;
	private $color;
	private $x_size;
	private $y_size;
	
	public function __construct($_x_size,$_y_size)
	{
		if(is_numeric($_x_size) && is_numeric($_y_size))
		{
			$this->x_size = $_x_size;
			$this->y_size = $_y_size;
			$this->createImages($_x_size,$_y_size);
		}
	}
	
	private function createImages($x_size,$y_size)
	{
		if(is_numeric($x_size) && is_numeric($y_size))
		{
			$this->dest = imagecreatetruecolor($x_size,$y_size);
			imagealphablending($this->dest,false);
			imagesavealpha($this->dest,true);
			return true;
		}
		return false;
	}
	
	public function setColor($red=0,$green=0,$blue=0)
	{
		if(is_numeric($red) && is_numeric($green) && is_numeric($blue))
		{
			if(is_resource($this->dest) && get_resource_type($this->dest)=='gd')
				$this->color = imagecolorallocate($this->dest,$red,$green,$blue);
				return $this->color;
		}
		return false;
	}
	
	public function setAlphaColor($red=0,$green=0,$blue=0,$alpha=80)
	{
		if(is_numeric($red) && is_numeric($green) && is_numeric($blue))
		{
			if(is_resource($this->dest) && get_resource_type($this->dest)=='gd')
				$this->color = imagecolorclosestalpha($this->dest,$red,$green,$blue,$alpha);
				return $this->color;
		}
		return false;
	}
	
	public function setTXT($text,$x=0,$y=0,$size=10,$angle=0,$color='',$fontfile='')
	{		
		if(!empty($text) && is_resource($this->dest) && get_resource_type($this->dest)=='gd')
		{
			if(empty($color))$color = $this->setColor(0,0,0);
			if(empty($fontfile))
				$fontfile = dirname(__FILE__).'/font/simsun.ttc';
			else
				$fontfile = dirname(__FILE__).'/font/'.$fontfile;
				
			if(file_exists($fontfile))
			{
				return imagettftext($this->dest,$size,$angle,$x,$y,$color,$fontfile,$text);
			}
		}
		return false;
	}
	
	public function setCenterTXT($text,$size=10,$color='',$fontfile='')
	{
		if(!empty($text) && is_resource($this->dest) && get_resource_type($this->dest)=='gd')
		{
			if(empty($color))$color = $this->setColor(0,0,0);
			if(empty($fontfile))
				$fontfile = dirname(__FILE__).'/font/simsun.ttc';
			else
				$fontfile = dirname(__FILE__).'/font/'.$fontfile;
				
			if(file_exists($fontfile))
			{
				$imgsize = imagettfbbox($size,0,$fontfile,$text);
				$TextWidth = $imgsize[4];
				$TextHeight = abs($imgsize[7]);
				$pic_w = abs(($this->x_size-$TextWidth)/2);
				$pic_h = abs(($this->y_size-$TextHeight)/2+$size-20);
				imagealphablending($this->dest,true);
				return imagettftext($this->dest,$size,0,$pic_w,$pic_h,$color,$fontfile,$text);
			}
		}
		return false;
	}
	
	public function copyIMG($filename,$percent=1,$dst_x=0,$dst_y=0,$src_x=0,$src_y=0)
	{
		if(file_exists($filename) && is_resource($this->dest) && get_resource_type($this->dest)=='gd')
		{
			if(is_numeric($dst_x) && is_numeric($dst_y) && is_numeric($src_x) && is_numeric($src_y))
			{
				$info = getimagesize($filename);
				$width = $info['0'];
				$height = $info['1'];
				$newwidth = $width * $percent;
				$newheight = $height * $percent;
				switch($info['mime'])
				{ 
					case "image/gif":
						$source = imagecreatefromgif($filename);
						imagecopyresized($this->dest,$source,$dst_x,$dst_y,$src_x,$src_y,$newwidth,$newheight,$width,$height);
						break; 
					case "image/jpeg":
						$source = imagecreatefromjpeg($filename);
						imagecopyresized($this->dest,$source,$dst_x,$dst_y,$src_x,$src_y,$newwidth,$newheight,$width,$height);
						break; 
					case "image/png": 
						$source = imagecreatefrompng($filename);
						imagecopyresized($this->dest,$source,$dst_x,$dst_y,$src_x,$src_y,$newwidth,$newheight,$width,$height);
						break;
				}
			}
		}
		return false;
	}
	
	public function fillBG($color,$x=0,$y=0)
	{
		if(is_numeric($this->color) && is_numeric($x) && is_numeric($y))
		{
			if(empty($color))$color = $this->setColor(0,0,0);
			if(is_resource($this->dest) && get_resource_type($this->dest)=='gd')
				return imagefill($this->dest,$x,$y,$color);
		}
		return false;
	}
	
	public function echoIMG($name='',$path='',$type='jpg',$quality=100)
	{
		if(is_resource($this->dest) && get_resource_type($this->dest)=='gd')
		{
			empty($path) ? $filepath = './' : $filepath = $path;
			
			$filepath = rtrim($filepath,'/');
			
			$type = strtolower($type);
			
			if(file_exists($filepath) && !empty($name))
			{
				switch($type)
				{
					case 'jpg':
						imagejpeg($this->dest,$filepath.'/'.$name.'.jpg',$quality);
					break;
					
					case 'png':
						imagepng($this->dest,$filepath.'/'.$name.'.png');
					break;
					
					case 'gif':
						imagejpeg($this->dest,$filepath.'/'.$name.'.gif');
					break;
					
					default:
						imagejpeg($this->dest,$filepath.'/'.$name,$quality);
				}
			}
		}
		return false;
	}
	
	public function __destruct()
	{
		if(is_resource($this->dest) && get_resource_type($this->dest)=='gd')
			imagedestroy($this->dest);
	}
}
?>

具体参数看代码就知道；

$img = new WaterMark(225,170);

$img->copyIMG('./temp/bg.png');

$img->setCenterTXT($name,30,$img->setColor(0,0,0),'STXIHEI.TTF');

$img->echoIMG('./images/ImgfileName','','png');