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Thumbnail images in PHP
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Written by Mohammad Dayyan   
Friday, 30 January 2009 16:00

Introduction

At times we need to change image size .
Now I show you how we can do that by PHP.

Using the Code

There is a function in the sorce code .
Now I describe it :


function thumbnail_image($original_file_path, $new_width, $new_height, $save_path="")

parameters :
$original_file_path : Path of original image
$new_width : Width of thumbnail image
$new_height : Height of thumbnail image
$save_path: Path of created thumbnail ( if you leave it the thumbnail image saves in the original image"s folder with thumbnail.* name)

returns :
This function is void thus returns nothing.
This function creates thumbnail image in


sample : 

    <?php
require_once("thumbnail.php");
thumbnail_image("source.jpg","320", "200", "");
?>

Above sample creats thumbnail.jpg in 320*200 image inside of source.jpg


How does it work


I got image information by getimagesize PHP function. 

$imgInfo = getimagesize($original_file_path);
$imgExtension = ""; //extension of original image

switch ($imgInfo[2])
{
    case 1:
        $imgExtension = ".gif";
        break;

    case 2:
        $imgExtension = ".jpg";
        break;

    case 3:
        $imgExtension = ".png";
        break;
}


If $save_path equals "" then thumbnail file will be "thumbnail".$imgExtension 
    if ($save_path=="") $save_path = "thumbnail".$imgExtension ;
Getting width and height of original size and create an image object to creating thumbnail image 
    // Get new dimensions
list($width, $height) = getimagesize($original_file_path);

// Resample
$imageResample = imagecreatetruecolor($new_width, $new_height);

if ( $imgExtension == ".jpg" )
{
    $image = imagecreatefromjpeg($original_file_path);
}
else if ( $imgExtension == ".gif" )
{
    $image = imagecreatefromgif($original_file_path);
}
else if ( $imgExtension == ".png" )
{
    $image = imagecreatefrompng($original_file_path);
}

imagecopyresampled($imageResample, $image, 0, 0, 0, 0, $new_width,
 $new_height, $width, $height);
Lastly creates a thumbnail image and save it 
    if ( $imgExtension == ".jpg" )
{
    imagejpeg($imageResample, $save_path);
}
else if ( $imgExtension == ".gif" )
{
    imagegif($imageResample, $save_path);
}
else if ( $imgExtension == ".png" )
{
    imagepng($imageResample, $save_path);
}
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Last Updated on Friday, 06 February 2009 16:00
 

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