PHP function code for adding watermark function and thumbnail to pictures_PHP tutorial

php function code for adding watermark function and thumbnail to pictures
/**
* Add watermark to the image
* @param string $desImg The target image parameter format is ./images/pic.jpg
* @param string $waterImg The watermark image parameter format is the same as above, and the watermark image is in png format. Background transparent
* @param int positon Watermark position 1: Top left 2: Top right 3: Center 4: Bottom left 5: Bottom right
* @param bool $saveas Whether to save as, default value false, Indicates overwriting the original image
* @param int $alpha The opacity of the watermark image
* @return string $savepath The path of the new image
* **/
function watermark($desImg,$waterImg,$positon=1,$saveas=false,$alpha =30)
{
//Get the basic information of the target image
$temp=pathinfo($desImg);
$name=$temp["basename"];//File name
$path=$temp["dirname"];//The folder where the file is located
$extension=$temp["extension"];//File extension
if($saveas)
{
//Need to save as
$name=rtrim($name,".$extension")."_2.";//Rename
$savepath=$path."/".$name .$extension;
}
else
{
//Overwrite the original image if there is no need to save as
$savepath=$path."/".$name;
}
$info=getImageInfo($desImg);//Get the information of the target image
$info2=getImageInfo($waterImg);//Get the information of the watermark image

$desImg=create($desImg );//Create from the original image
$waterImg=create($waterImg);//Create from the watermark image
//Position 1: top left
if($positon==1)
{
$x=0;
$y=0;
}
//Position 2: Top right
if($positon==2)
{
$x=$info[0]-$info2[0];
$y=0;
}
//Position 3: Centered
if($positon==3)
{
$x=($info[0]-$info2[0])/2;
$y=($info[1]-$info2[1])/2;
}
//Position 4: bottom left
if($positon==4)
{
$x=0;
$y=$info[1]-$info2[1];
}
//Position 5: bottom right
if($positon==5)
{
$x=$info[0]-$info2[0];
$y=$info[1]-$info2[1];
}
imagecopymerge($desImg,$waterImg,$x,$y,0,0,$info2[0],$info2[ 1],$alpha);
imagejpeg($desImg,$savepath);
imagedestroy($desImg);
imagedestroy($waterImg);
return $savepath;
}
/**
* Get image information, width, height, image/type
* @param string $src image path
* @return array
* **/
function getImageInfo($src)
{
return getimagesize($src);
}
/**
* Create an image and return the resource type
* @param string $src Image path
* @return resource $im Return the resource type
* **/
function create($src)
{
$info=getImageInfo($src);
switch ($info[2])
{
case 1:
$im=imagecreatefromgif ($src);
break;
case 2:
$im=imagecreatefromjpeg($src);
break;
case 3:
$im=imagecreatefrompng($src) ;
break;
}
return $im;
}
/**
* Thumbnail main function
* @param string $src image path
* @param int $w thumbnail width
* @param int $h thumbnail height
* @return mixed Return thumbnail path
* **/

function resize($src,$w,$h)
{
$temp=pathinfo($src);
$name=$temp["basename"];//File name
$dir=$temp["dirname"];// The folder where the file is located
$extension=$temp["extension"];//File extension
$savepath="{$dir}/{$name}.thumb.jpg";//Thumbnail Save path, the new file name is *.thumb.jpg

//Get the basic information of the image
$info=getImageInfo($src);
$width=$info[0]; //Get the image width
$height=$info[1];//Get the image height
$per1=round($width/$height,2);//Calculate the original image aspect ratio
$per2=round($w/$h,2);//Calculate the thumbnail aspect ratio

//Calculate the scaling ratio
if($per1>$per2||$per1==$ per2)
{
//The aspect ratio of the original image is greater than or equal to the aspect ratio of the thumbnail, then the width will be given priority
$per=$w/$width;
}
if( $per1<$per2)
{
//The aspect ratio of the original image is smaller than the aspect ratio of the thumbnail, then the height priority is given
$per=$h/$height;
}
$temp_w=intval($width*$per);//Calculate the width of the original image after scaling
$temp_h=intval($height*$per);//Calculate the height of the original image after scaling
$temp_img =imagecreatetruecolor($temp_w,$temp_h);//Create canvas
$im=create($src);
imagecopyresampled($temp_img,$im,0,0,0,0,$temp_w,$temp_h ,$width,$height);
if($per1>$per2)
{
imagejpeg($temp_img,$savepath);
return addBg($savepath,$w,$h, "w");
//Width priority, add the background if the height is insufficient after scaling
}
if($per1==$per2)
{
imagejpeg($ temp_img,$savepath);
return $savepath;
//proportional scaling
}
if($per1<$per2)
{
imagejpeg($temp_img,$savepath );

return addBg($savepath,$w,$h,"h");
//Height priority, if the width is insufficient after scaling, add the background
}
}
/**
* Add background
* @param string $src image path
* @param int $w background image width
* @param int $h background image height
* @param String $first Determines the final position of the image, w width takes precedence h height takes precedence wh: proportional
* @return returns the image with background
* **/
function addBg($src,$w,$h,$fisrt="w")
{
$bg=imagecreatetruecolor($w,$h);
$white = imagecolorallocate($bg,255,255,255);
imagefill($bg,0,0,$white);//Fill the background

//Get the target image information
$info =getImageInfo($src);
$width=$info[0];//Target image width
$height=$info[1];//Target image height
$img=create($ src);
if($fisrt=="wh")
{
//Constant scaling
return $src;
}
else
{
if($fisrt=="w")
{
$x=0;
$y=($h-$height)/2;//Vertically centered
}
if ($fisrt=="h")
{
$x=($w-$width)/2;//Horizontal centering
$y=0;
}
imagecopymerge( $bg,$img,$x,$y,0,0,$width,$height,100);
imagejpeg($bg,$src);
imagedestroy($bg);
imagedestroy ($img);
return $src;
}

}

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