PHP implementation code to obtain remote images and adjust image size-PHP Tutorial-php.cn

PHP implementation code to obtain remote images and adjust image size

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Release： 2016-07-25 09:00:05

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/**
*
*Function: adjust image size or generate thumbnail
*Modified: 2013-2-15
*Return: True/False
*Parameters:
* $Image The image that needs to be adjusted (including path)
* $Dw= 450 The maximum width when adjusting; the absolute width when thumbnailing
* $Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
* $Type=1 1, adjust the size; 2, generate thumbnails
* site http: //bbs.it-home.org
*/
$phtypes=array('img/gif', 'img/jpg', 'img/jpeg', 'img/bmp', 'img /pjpeg', 'img/x-png');
function compressImg($Image,$Dw,$Dh,$Type){
echo $Image;
IF(!file_exists($Image)){
echo " No image exists";
return false;
}
echo "Image exists";
// If you need to generate a thumbnail, copy the original image and re-assign it to $Image (generate thumbnail operation)
// When Type= =1, the original image file will not be copied, but the reduced image will be regenerated on the original image file (resize operation)
IF($Type!=1){
copy($Image,str_replace(" .","_x.",$Image));
$Image=str_replace(".","_x.",$Image);
}
// Get the file type and create different objects according to different types
$ImgInfo=getimagesize($Image);
Switch($ImgInfo[2]){
case 1:
$Img =@imagecreatefromgif($Image);
break;
case 2:
$Img =@imagecreatefromjpeg($ Image);
Break;
case 3:
$Img =@imagecreatefrompng($Image);
break;
}
// If the object is not created successfully, it means it is a non-image file
IF(Empty($Img)){
// If there is an error when generating thumbnails, you need to delete the copied files
IF($Type!=1){
unlink($Image);
}
return false;
}
// If yes To perform the resize operation,
IF($Type==1){
$w=ImagesX($Img);
$h=ImagesY($Img);
$width = $w;
$height = $h;
IF($width>$Dw){
$Par=$Dw/$width;
$width=$Dw;
$height=$height*$Par;
IF($height>$Dh){
$Par= $Dh/$height;
$height=$Dh;
$width=$width*$Par;
}
} ElseIF($height>$Dh) {
$Par=$Dh/$height;
$height= $Dh;
$width=$width*$Par;
IF($width>$Dw){
$Par=$Dw/$width;
$width=$Dw;
$height=$height*$Par;
}
} Else {
$width=$width;
$height=$height;
}
$nImg =ImageCreateTrueColor($width,$height);// Create a new true color canvas
ImageCopyReSampled($nImg,$Img ,0,0,0,0,$width,$height,$w,$h);//Resample and copy part of the image and resize it
ImageJpeg($nImg,$Image);//Output the image in JPEG format To the browser or file
return true;
} Else {// If the thumbnail generation operation is performed,
$w=ImagesX($Img);
$h=ImagesY($Img);
$width = $w;
$height = $h;
$nImg =ImageCreateTrueColor($Dw,$Dh);
IF($h/$w>$Dh/$Dw){// Height is larger
$width=$Dw;
$ height=$h*$Dw/$w;
$IntNH=$height-$Dh;
ImageCopyReSampled($nImg, $Img, 0, -$IntNH/1.8, 0, 0, $Dw, $height, $w , $h);
} Else {// Larger width ratio
$height=$Dh;
$width=$w*$Dh/$h;
$IntNW=$width-$Dw;
ImageCopyReSampled($nImg, $Img,-$IntNW/1.8,0,0,0, $width, $Dh, $w, $h);
}
ImageJpeg($nImg,$Image);
return true;
}
};
?>

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2. Get remote pictures

//Network image path
$imgPath = 'http://bbs.it-home.org/phone/compress-img/251139474ba926db3d7850.jpg';
//$imgPath = "http://bbs.it-home.org/userfiles/image/20111125/251139474ba926db3d7850.jpg";
$tempPath = str_replace('http://bbs.it-home.org/', '', $imgPath );//Replace newline characters
$name = strrchr($tempPath, "/");
$path = str_replace($name, '', $tempPath);//Replace newline characters
/**
*Create multi-level directories based on the path path
*$dir target directory $mode permissions, 0700 represents the highest permissions
*/
function makedir( $dir , $mode = "0700" ) {
if(strpos($dir , "/" )){
$dir_path = "" ;
$dir_info = explode("/" , $dir );
foreach($dir_info as $key => $value){
$dir_path .= $value ;
if (!file_exists($dir_path)){
@mkdir($dir_path, $mode) or die (" Failed to create folder" );
@chmod($dir_path, $mode);
} else {
$dir_path .= "/" ;
continue ;
}
$dir_path .= "/" ;
}
return $dir_path ;
} else {
@mkdir($dir, $mode) or die( "Creation failed, please check permissions" );
@chmod($dir, $mode);
return $dir ;
}
} //end makedir
makedir($path);
/**
*Get the image on the server based on the url
*$url The image path on the server $filename file name
*/
function GrabImage($url,$filename="") {
if($url=="") return false;
if($filename=="") {
$ext=strrchr($url,".");
if($ext!=".gif" && $ext!=".jpg" && $ext!= ".png")
return false;
$filename=date("YmdHis").$ext;
}
ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$size = strlen($img);
$fp2=@fopen($filename, "a");
fwrite($fp2,$img);
fclose($fp2);
return $filename;
}
?>

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3. Call example

The file types allowed to be uploaded are:
echo $path ."
";
/**/
$bigImg=GrabImage($imgPath, $tempPath);
if($bigImg){
echo '
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