index.php

use JB\FlyImages;

class Helpers {

//...
    
    public static function flyImageSrcFromUrl($attachment_url = '', $size = '', $crop = null) {
        $fly_images = FlyImages\Core::get_instance();
        
        $attachment_url = str_replace(' ', '%20', $attachment_url);
        
        if ( empty($attachment_url) || empty( $size ) ) {
            return array();
        }
        
        // If size is 'full', we don't need a fly image
        if ( 'full' === $size ) {
            return $attachment_url;
        }
        
        // Get the attachment image
        $image = self::getImageInfo( $attachment_url );
        
        if ( false !== $image && $image ) {
            // Determine width and height based on size
            switch ( gettype( $size ) ) {
                case 'string':
                    $image_size = $fly_images->get_image_size( $size );
                    if ( empty( $image_size ) ) {
                        return [];
                    }
                    $width  = $image_size['size'][0];
                    $height = $image_size['size'][1];
                    $crop   = isset( $crop ) ? $crop : $image_size['crop'];
                    break;
                case 'array':
                    $width  = $size[0];
                    $height = $size[1];
                    break;
                default:
                    return [];
            }
            
            $image_fly_url = str_replace('%20', '_', $image['url']);
            
            // Get file path
            $fly_dir       = $fly_images->get_fly_dir();
            $fly_file_path = $fly_dir . DIRECTORY_SEPARATOR . $fly_images->get_fly_file_name( basename( $image_fly_url ), $width, $height, $crop );
            
            // Check if file exsists
            if ( file_exists( $fly_file_path ) ) {
                $image_size = getimagesize( $fly_file_path );
                if ( ! empty( $image_size ) ) {
                    return $fly_images->get_fly_path( $fly_file_path );
                } else {
                    return [];
                }
            }
            
            // Check if images directory is writeable
            if ( ! $fly_images->fly_dir_writable() ) {
                return [];
            }
            
            // File does not exist, lets check if directory exists
            $fly_images->check_fly_dir();
            
            // Create new image
            if($image['ext'] == 'jpg' || $image['ext'] == 'jpeg') {
                imagejpeg(self::resizeImage($attachment_url, $width, $height, $crop, $image['ext']), $fly_file_path);
            }
            elseif($image['ext'] == 'png') {
                imagepng(self::resizeImage($attachment_url, $width, $height, $crop, $image['ext']), $fly_file_path);
            }
            
            $image_dimensions = self::getImageInfo($fly_file_path);
            return $fly_images->get_fly_path( $fly_file_path );
        }
        
        // Something went wrong
        return [];
    }
    
    private static function getImageInfo($url) {
        $image_sizes = getimagesize($url);
        $image_info = pathinfo($url);
        
        $res = [
            'width' =>  $image_sizes[0],
            'height' =>  $image_sizes[1],
            'name' => $image_info['filename'],
            'ext' => $image_info['extension'],
            'url' => $url
        ];
        
        return $res;
    }
    
    private static function resizeImage($file, $w, $h, $crop = false, $ext = 'jpeg') {
        
        list($width, $height) = getimagesize($file);
        $r = $width / $height;
        if ($crop) {
            if ($width > $height) {
                $width = ceil($width-($width*abs($r-$w/$h)));
            } else {
                $height = ceil($height-($height*abs($r-$w/$h)));
            }
            $newwidth = $w;
            $newheight = $h;
        } else {
            if ($w/$h > $r) {
                $newwidth = $h*$r;
                $newheight = $h;
            } else {
                $newheight = $w/$r;
                $newwidth = $w;
            }
        }
        
        if($ext == 'jpeg' || $ext = 'jpg') {
            $src = imagecreatefromjpeg($file);
        }
        elseif ($ext == 'png') {
            $src = imagecreatefrompng($file);
        }
        else {
            return 'false';
        }
        
        $dst = imagecreatetruecolor($newwidth, $newheight);
        imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
        
        return $dst;
    }


//...
    
}