How to create thumbnail image in php using ajax
For image upload we are going to use the ajax image upload plugin. We will add thumbnail creation in the ajax image upload plugin described in the post – http://tutorialsplane.com/ajax-image-upload-using-php-and-jquery-demo/.
We are going to modify and add the thumbnail function in the post : http://tutorialsplane.com/ajax-image-upload-using-php-and-jquery-demo/
The below function is called and the required parameters are passed to create the thumbnail of the the uploaded image.
Example
<?php
function createThumbs($pathToImages,$fname, $pathToThumbs, $thumbWidth ,$thumbHeight)
{
$srcFile = $pathToImages.$fname;
$thumbFile = $pathToThumbs.$fname;
if(!empty($fname))
{
try {
$type = strtolower(substr( $fname , strrpos( $fname , '.' )+1 ));
$thumbnail_width=$thumbWidth;
$thumbnail_height=$thumbHeight;
switch( $type ){
case 'jpg' : case 'jpeg' :
try{
$src = imagecreatefromjpeg( $srcFile ); break;
}
catch(Exception $e) {
echo $e->getMessage();
exit;
}
///$src = imagecreatefromjpeg( $srcFile ); break;
case 'jpeg' : case 'jpeg' :
try{
$src = imagecreatefromjpeg( $srcFile ); break;
}
catch(Exception $e) {
echo $e->getMessage();
exit;
}
case 'png' :
$src = imagecreatefrompng( $srcFile ); break;
case 'gif' :
$src = imagecreatefromgif( $srcFile ); break;
}
list($width_orig, $height_orig) = getimagesize($srcFile);
$ratio_orig = $width_orig/$height_orig;
if ($thumbnail_width/$thumbnail_height > $ratio_orig) {
$new_height = $thumbnail_width/$ratio_orig;
$new_width = $thumbnail_width;
} else {
$new_width = $thumbnail_height*$ratio_orig;
$new_height = $thumbnail_height;
}
$x_mid = $new_width/2; //horizontal middle
$y_mid = $new_height/2; //vertical middle
$process = imagecreatetruecolor(round($new_width), round($new_height));
imagecopyresampled($process, $src, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
$dest_img = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresampled($dest_img, $process, 0, 0, ($x_mid-($thumbnail_width/2)), ($y_mid-($thumbnail_height/2)), $thumbnail_width, $thumbnail_height, $thumbnail_width, $thumbnail_height);
switch( $type ){
case 'jpg' : case 'jpeg' :
$src = imagejpeg( $dest_img , $thumbFile ); break;
case 'png' :
$src = imagepng( $dest_img , $thumbFile ); break;
case 'gif' :
$src = imagegif( $dest_img , $thumbFile ); break;
}
}catch(Exception $e) {
echo $e->getMessage();
exit;
}
}else{
echo "<p style='color:red'> Thumbnail Creation Error : Thumbnail name can't be empty please add the thumbnail name.</p>";
exit;
}
}
?>
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