Zabbix

<?php

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

​

function get_default_image() {

    $image = imagecreate(50, 50);

    $color = imagecolorallocate($image, 250, 50, 50);

    imagefill($image, 0, 0, $color);

​

    return $image;

}

​

/**

 * Get image data from db, cache is used

 * @param  $imageid

 * @return array image data from db

 */

function get_image_by_imageid($imageid) {

    static $images = [];

​

    if (!isset($images[$imageid])) {

        $row = DBfetch(DBselect('SELECT i.* FROM images i WHERE i.imageid='.zbx_dbstr($imageid)));

        $images[$imageid] = $row;

    }

    return $images[$imageid];

}

​

/**

 * Resizes the given image resource to the specified size keeping the original

 * proportions of the image.

 *

 * @param resource $source

 * @param int $thumbWidth

 * @param int $thumbHeight

 *

 * @return resource

 */

function imageThumb($source, $thumbWidth = 0, $thumbHeight = 0) {

    $srcWidth   = imagesx($source);

    $srcHeight  = imagesy($source);

​

    if ($srcWidth > $thumbWidth || $srcHeight > $thumbHeight) {

        if ($thumbWidth == 0) {

            $thumbWidth = $thumbHeight * $srcWidth / $srcHeight;

        }

        elseif ($thumbHeight == 0) {

            $thumbHeight = $thumbWidth * $srcHeight / $srcWidth;

        }

        else {

            $a = $thumbWidth / $thumbHeight;

            $b = $srcWidth / $srcHeight;