timthumb.php

<?php

// TimThumb script created by Tim McDaniels and Darren Hoyt with tweaks by Ben Gillbanks for the Mimbo Pro theme
// May be re-used pending permission of the authors, email cutout@gmail.com
// Copyright 2008

/* request parameters that can be sent to this script */

// src: location of file from doc root
// w: width
// h: height
// zc: zoom crop (0 or 1)
// q: quality (default is 75 and max is 100)

// either width or height can be used
// example: <img src="/resizeImage.php?src=images/image.jpg&h=150" alt="some image" />

if( !isset( $_REQUEST[ "src" ] ) ) { die( "no image specified" ); }

// clean params before use
$src		= preg_replace( "/^(\.+(\/|))+/", "", $_REQUEST['src'] );
$src		= preg_replace( '/^(s?f|ht)tps?:\/\/[^\/]+/i', '', $src );
$new_width	= preg_replace( "/[^0-9]/", "", $_REQUEST[ 'w' ] );
$new_height = preg_replace( "/[^0-9]/", "", $_REQUEST[ 'h' ] );
$zoom_crop	= preg_replace( "/[^0-9]/", "", (isset($_REQUEST[ 'zc' ]) && !empty($_REQUEST[ 'zc' ])) ? $_REQUEST[ 'zc' ] : null );

if( !isset( $_REQUEST['q'] ) ) {
    $quality = 80;
} else {
    $quality = preg_replace("/[^0-9]/", "", $_REQUEST['q'] );
}

// set path to cache directory (default is ./cache)
// this can be changed to a different location
$cache_dir = './cache';

// check to see if this image is in the cache already
check_cache( $cache_dir, $quality, $zoom_crop);

// get mime type of src
$mime_type = mime_type( $src );

// make sure that the src is gif/jpg/png
if( !valid_src_mime_type( $mime_type ) ) {
    $error = "Invalid src mime type: $mime_type";
    die( $error );
}

// check to see if GD function exist
if(!function_exists('imagecreatetruecolor')) {
    $error = "GD Library Error: imagecreatetruecolor does not exist";
    die( $error );
}

// get path to image on file system
$src = $_SERVER['DOCUMENT_ROOT'] . '/' . $src;

if(strlen($src) && file_exists( $src ) ) {

    // open the existing image
    $image = open_image($mime_type, $src);
    if ($image === false) { die ('Unable to open image : ' . $src ); }

    // Get original width and height
    $width = imagesx($image);
    $height = imagesy($image);

    // generate new w/h if not provided
    if($new_width && !$new_height) {
        $new_height = $height * ($new_width/$width);
    }
    elseif($new_height && !$new_width) {
        $new_width = $width * ($new_height/$height);
    }
    elseif(!$new_width && !$new_height) {
        $new_width = $width;
        $new_height = $height;
    }

    // create a new true color image
    $canvas = imagecreatetruecolor($new_width, $new_height);

    if( $zoom_crop ) {

        $src_x = $src_y = 0;
        $src_w = $width;
        $src_h = $height;

        $cmp_x = $width  / $new_width;
        $cmp_y = $height / $new_height;

        // calculate x or y coordinate and width or height of source

        if ( $cmp_x > $cmp_y ) {

            $src_w = round( ( $width / $cmp_x * $cmp_y ) );
            $src_x = round( ( $width - ( $width / $cmp_x * $cmp_y ) ) / 2 );

        } elseif ( $cmp_y > $cmp_x ) {

            $src_h = round( ( $height / $cmp_y * $cmp_x ) );
            $src_y = round( ( $height - ( $height / $cmp_y * $cmp_x ) ) / 2 );

        }

        imagecopyresampled( $canvas, $image, 0, 0, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h );

    } else {

        // copy and resize part of an image with resampling
        imagecopyresampled( $canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

    }

    // output image to browser based on mime type
    show_image( $mime_type, $canvas, $quality, $cache_dir, $zoom_crop );

    // remove image from memory
    ImageDestroy( $canvas );

} else {

    if( strlen( $src ) ) { echo $src . ' not found.'; } else { echo 'no source specified.'; }

}

function show_image ($mime_type, $image_resized, $quality, $cache_dir, $zoom_crop) {

    // check to see if we can write to the cache directory
    $is_writable = 0;
    $cache_file_name = $cache_dir . '/' . get_cache_file($quality, $zoom_crop);

    if( touch( $cache_file_name ) ) {
        // give 666 permissions so that the developer
        // can overwrite web server user
        chmod( $cache_file_name, 0666 );
        $is_writable = 1;
    } else {
        $cache_file_name = NULL;
        header('Content-type: ' . $mime_type);
    }

    if(stristr( $mime_type, 'gif' ) ) {
        imagegif( $image_resized, $cache_file_name );
    } elseif( stristr( $mime_type, 'jpeg' ) ) {
        imagejpeg( $image_resized, $cache_file_name, $quality );
    } elseif( stristr( $mime_type, 'png' ) ) {
        imagepng( $image_resized, $cache_file_name, ceil( $quality / 10 ) );
    }

    if( $is_writable ) { show_cache_file( $cache_dir, $quality, $zoom_crop ); }

    exit;

}

function open_image ($mime_type, $src) {

    if(stristr($mime_type, 'gif')) {
        $image = imagecreatefromgif($src);
    } elseif(stristr($mime_type, 'jpeg')) {
        $image = imagecreatefromjpeg($src);
    } elseif(stristr($mime_type, 'png')) {
        $image = imagecreatefrompng($src);
    }

    return $image;

}

function mime_type ($file) {
    $frags = explode(".", $file);
    $ext = strtolower(end($frags));

    $types = array(
        'jpg'  => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'png'  => 'image/png',
        'gif'  => 'image/gif',
        'bmp'  => 'image/bmp',
        'doc'  => 'application/msword',
        'xls'  => 'application/msword',
        'xml'  => 'text/xml',
        'html' => 'text/html'
    );

    if (array_key_exists($ext, $types)) {
        $mime_type = $types[$ext];
    } else {
        $mime_type = 'unknown';
    }
    return $mime_type;
}

function valid_src_mime_type ($mime_type) {

    if( preg_match( "/jpg|jpeg|gif|png/i", $mime_type ) ) { return 1; }
    return 0;

}

function check_cache ($cache_dir, $quality, $zoom_crop) {

    // make sure cache dir exists
    if(!file_exists($cache_dir)) {
        // give 777 permissions so that developer can overwrite
        // files created by web server user
        mkdir($cache_dir);
        chmod($cache_dir, 0777);
    }

    show_cache_file($cache_dir, $quality, $zoom_crop);
}

function show_cache_file ( $cache_dir,$quality, $zoom_crop ) {

    $cache_file = get_cache_file($quality, $zoom_crop);

    if( file_exists( $cache_dir . '/' . $cache_file ) ) {

        // check for updates
        $gmdate_mod	= gmdate('D, d M Y H:i:s', filemtime( $cache_dir . '/' . $cache_file ) ) . " GMT";
        if ( isset( $_SERVER['HTTP_IF_MODIFIED_SINCE' ] ) ) {

            $if_modified_since = preg_replace( "/;.*$/", "", $_SERVER[ "HTTP_IF_MODIFIED_SINCE" ] );
            if ( $if_modified_since >= $gmdate_mod ) {
                header( "HTTP/1.1 304 Not Modified" );
                die();
            }
        }

        $dateNow = date("d M Y H:i:s");
        $thumbModified = strtotime($dateNow);

        // send headers then display image
        header( "Content-Type: " . mime_type( $cache_file ) );
        header( "Last-Modified: " . gmdate('D, d M Y H:i:s', $thumbModified) . " GMT" );
        header( "Content-Length: " . filesize( $cache_dir . '/' . $cache_file ) );
        header( "Cache-Control: max-age=9999" );
        header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + 99999 ) . "GMT");
        readfile( $cache_dir . '/' . $cache_file );
        die();

    }

}

function get_cache_file ($quality, $zoom_crop) {
    $request_params = $_REQUEST;
    $cachename = $_REQUEST['src'] . $_REQUEST['w'] . $_REQUEST['h'] . $zoom_crop . $quality;
    $cache_file = md5( $cachename );
    return $cache_file;
}

?>