Simple upload image and create a thumbnail image

Here is an example for a simple way of uploading an image and then create a thumbnail image automatically. This PHP script does the following:

  • it uploads the image to a temporary location,
  • then it copies the uploaded image to a permanent location,
  • the script then creates a smaller thumbnail image and saves this to a special thumbnail image location

This PHP script is set up only to allow the upload of JPG formatted images. But with some PHP knowledge you will be able to change this.

How could you use this? For example you can use it for youreself only as part of a Content Management System (CMS). You could also add a MySQL query to insert the information about the image to a database.

<?php
$idir
= “images/”; // Path To Images Directory
$tdir = “images/thumbs/”; // Path To Thumbnails Directory
$twidth = “125”; // Maximum Width For Thumbnail Images
$theight = “100”; // Maximum Height For Thumbnail Images

if (!isset($_GET[‘subpage’])) { // Image Upload Form Below

?>
<form method=”post” action=”addphoto.php?subpage=upload” enctype=”multipart/form-data”>
File:<br />
<input type=”file” name=”imagefile” class=”form”>
<br /><br />
<input name=”submit” type=”submit” value=”Sumbit” class=”form”>  <input type=”reset” value=”Clear” class=”form”>
</form>

<?php } else  if (isset($_GET[‘subpage’]) && $_GET[‘subpage’] == ‘upload’) {
// Uploading/Resizing Script
$url = $_FILES[‘imagefile’][‘name’]; // Set $url To Equal The Filename For Later Use
if ($_FILES[‘imagefile’][‘type’] == “image/jpg” || $_FILES[‘imagefile’][‘type’] == “image/jpeg” || $_FILES[‘imagefile’][‘type’] == “image/pjpeg”) {
$file_ext = strrchr($_FILES[‘imagefile’][‘name’], ‘.’); // Get The File Extention In The Format Of , For Instance, .jpg, .gif or .php
$copy = copy($_FILES[‘imagefile’][‘tmp_name’], “$idir” . $_FILES[‘imagefile’][‘name’]); // Move Image From Temporary Location To Permanent Location


if ($copy) { // True when the Script Was Able To Copy The uploaded Image To It’s Permanent Location
print ‘Image uploaded successfully.<br />’; // Was Able To Successfully Upload Image
$simg = imagecreatefromjpeg(“$idir” . $url); // Make A New Temporary Image To Create The Thumbanil From
$currwidth = imagesx($simg); // Current Image Width
$currheight = imagesy($simg); // Current Image Height
if ($currheight > $currwidth) { // If Height Is Greater Than Width
$zoom = $twidth / $currheight; // Length Ratio For Width
$newheight = $theight; // Height Is Equal To Max Height
$newwidth = $currwidth * $zoom; // Creates The New Width
} else { // Otherwise, Assume Width Is Greater Than Height (Will Produce Same Result If Width Is Equal To Height)
$zoom = $twidth / $currwidth; // Length Ratio For Height
$newwidth = $twidth; // Width Is Equal To Max Width
$newheight = $currheight * $zoom; // Creates The New Height
}
$dimg = imagecreate($newwidth, $newheight); // Make New Image For Thumbnail
imagetruecolortopalette($simg, false, 256); // Create New Color Pallete
$palsize = ImageColorsTotal($simg);
for (
$i = 0; $i < $palsize; $i++) { // Counting Colors In The Image
$colors = ImageColorsForIndex($simg, $i); // Number Of Colors Used
ImageColorAllocate($dimg, $colors[‘red’], $colors[‘green’], $colors[‘blue’]); // Tell The Server What Colors This Image Will Use
}
imagecopyresized($dimg, $simg, 0, 0, 0, 0, $newwidth, $newheight, $currwidth, $currheight); // Copy Resized Image To The New     Image (So We Can Save It)
imagejpeg($dimg, “$tdir” . $url); // Saving The Image
imagedestroy($simg); // Destroying The Temporary Image
imagedestroy($dimg); // Destroying The Other Temporary Image
print ‘Image thumbnail created successfully.’; // Resize successful
} else {
print
‘<font color=”#FF0000″>ERROR: Unable to upload image.</font>’; // Error Message If Upload Failed
}
} else {
print
‘<font color=”#FF0000″>ERROR: Wrong filetype (has to be a .jpg or .jpeg. Yours is ‘; // Error Message If Filetype Is Wrong
print $file_ext; // Show The Invalid File’s Extention
print ‘.</font>’;
}
}
?>

This is just one example. On this website you can find more solutions for uploading images with a form and PHP.

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This entry was posted on Monday, June 8th, 2009 at 12:36 pm
Entry is filed under Image upload.
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