Php is a powerful language. If you are thinking whether Php supports image processing like the other language Java, C# etc. than i must tell you, YES! Php have a powerful image processing library called as Php GD Library which contains many different useful functions that can help you in processing images.
Here i am going to introduce you a simple function through which you can resize any image easily. All the php functions used in this function are from php gd library. Its a really small php function with complete explanation. Just call the function with few parameters
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <?php function image_resize($imageName,$newName,$newWidth,$newHeight) { $imginfo = getimagesize($imageName); //get information about image $type = $imginfo[2]; //third element of array is image type if( $type == IMAGETYPE_JPEG ) { //if image is jpeg type $image = imagecreatefromjpeg($imageName); } elseif( $type == IMAGETYPE_GIF ) { // if image is gif type $image = imagecreatefromgif($imageName); } elseif( $type == IMAGETYPE_PNG ) { //if image is png type $image = imagecreatefrompng($imageName); } $new_img = imagecreatetruecolor($newWidth, $newHeight); //create a new image imagecopyresampled($new_img, $image, 0, 0, 0, 0, $newWidth, $newHeight, imagesx($image), imagesy($image)); imagejpeg($new_img,$newName,75); //save the image as jpeg } image_resize("original.jpg","output.jpg","100","150"); //how to use ?> <img src="original.jpg" /> <img src="output.jpg" /> |
Interesting post.You can follow this too.
?php
class SimpleImage {
var $image;
var $image_type;
function load($filename) {
$image_info = getimagesize($filename);
$this->image_type = $image_info[2];
if( $this->image_type == IMAGETYPE_JPEG ) {
$this->image = imagecreatefromjpeg($filename);
} elseif( $this->image_type == IMAGETYPE_GIF ) {
$this->image = imagecreatefromgif($filename);
} elseif( $this->image_type == IMAGETYPE_PNG ) {
$this->image = imagecreatefrompng($filename);
}
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image,$filename,$compression);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image,$filename);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image,$filename);
}
if( $permissions != null) {
chmod($filename,$permissions);
}
}
function output($image_type=IMAGETYPE_JPEG) {
if( $image_type == IMAGETYPE_JPEG ) {
imagejpeg($this->image);
} elseif( $image_type == IMAGETYPE_GIF ) {
imagegif($this->image);
} elseif( $image_type == IMAGETYPE_PNG ) {
imagepng($this->image);
}
}
function getWidth() {
return imagesx($this->image);
}
function getHeight() {
return imagesy($this->image);
}
function resizeToHeight($height) {
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width,$height);
}
function resizeToWidth($width) {
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);
}
function scale($scale) {
$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100;
$this->resize($width,$height);
}
function resize($width,$height) {
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
}
?>