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Resize Uploaded Image with PHP

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Image resizing certainly comes in handy for PHP applications that allows users upload photos. Image re-sizing helps users to create different versions of the same image. The following steps are required to re-size an uploaded image.

    Step 1: Create a Form to Upload Image

  1. To create the form use the following code.
    <form method=”post” action=”upload.php” enctype=”multipart/form-data”>
    <label>Upload File</label>
    <input type=”file” name=”imageFile”>
    <input type=”submit” value=”Upload & Resize”>
  2. Figure One

    Step 2: Create a Function to Resize image

  3. To create a function to resize the images using the following code.
    function resizePhoto($sExtName, $sFileOrigPath, $sFileSizePath, $iWidthSizeImg, $iHeightSizeImg)
    $aImageSize = getimagesize($sFileOrigPath); // Get dimensions of uploaded image in array
    $iWidth = $aImageSize[0]; //Width of Image
    $iHeight = $aImageSize[1]; // Height of Image

    list($sFileSourceWidth, $sFileSourceHeight, $sFileSourceType) = getimagesize($sFileOrigPath);

    $iNewWidth = $iWidthSizeImg; //Width of Resized Image
    $iNewHeight = $iHeightSizeImg; //Height of Resized Image

    if($sExtName == 'jpg' || $sExtName == 'jpeg' || $sExtName == 'JPG' || $sExtName == 'JPEG')
    //var $sExtName is the extension of image
    $img_src = imagecreatefromjpeg( $sFileOrigPath );
    $img_dst = imagecreatetruecolor( $iNewWidth, $iNewHeight );
    imagecopyresampled( $img_dst, $img_src, 0, 0, 0, 0, $iNewWidth, $iNewHeight, $iWidth, $iHeight );
    imagejpeg( $img_dst, $sFileSizePath, 90 );
  4. Step 3:Create a Function to Upload Image

  5. To create a function to upload the images using the following code.
    function uploadImage()
    $sPhotoFileName = $_FILES['imageFile']['name'];
    $sPhotoFileName = str_replace(' ','-',$sPhotoFileName);
    $aFileExt = explode('.', $sPhotoFileName);
    $sFileExt = array_pop($aFileExt);
    $sPhotoFileName = date("Ymdhis").'.'.$sFileExt;
    $sTmpFileName = $_FILES['pageImage']['tmp_name'];

    $sFileOrig = 'http://example.com/files/original/'.$sPhotoFileName; //Path of Original Image
    $sFileSml = 'http://example.com/files/thumbnail/'.$sPhotoFileName; // Path of Re-sized image

    $iWidthSmImg = '150'; //Width of resized image
    $iHeightSmImg = '236'; //Height if Re-sized Image

    if(move_uploaded_file($sTmpFileName, $sFileOrig))
    //Thumbnail Image Resize
    $bResize = $this->_resizePhoto($sFileExt, $sFileOrig, $sFileSml, $iWidthSmImg, $iHeightSmbImg);


Updated on Nov 11, 2015

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