pdf2i.php

<?php
<<<CONFIG
packages:
    - "symfony/process:^5.0"
CONFIG;

/**
 * Created by PhpStorm.
 * User: hocvt
 * Date: 2020-04-03
 * Time: 11:13
 */


use Symfony\Component\Process\Process;

class PdfToImageConverter {
    
    public static $bin = 'pdftocairo';
    protected $process;
    protected $page = 1;
    protected $width = 600;
    protected $quality = 100;
    
    protected $url;
    protected $path;
    protected $resource;
    
    protected function __construct() {
    
    }
    
    protected function validProcess( Process $process ) {
        $status = $process->getExitCode();
        $error = $process->getErrorOutput();
        
        if ( $status !== 0 and $error !== '' ) {
            throw new \RuntimeException(
                sprintf(
                    "The exit status code %s says something went wrong:\n stderr: %s\n stdout: %s\ncommand: %s.",
                    $status,
                    $error,
                    $process->getOutput(),
                    $process->getCommandLine()
                )
            );
        }
    }
    
    protected function getInput() {
        if ( $this->resource ) {
            return $this->resource;
        }
        if ( $this->path ) {
            return fopen( $this->path, "r" );
        }
        if ( $this->url ) {
            return file_get_contents( $this->url );
        }
    }
    
    
    ////// CREATOR ///////
    
    public static function fromFile( $path ): PdfToImageConverter {
        $instance = new self();
        $instance->path = $path;
        
        return $instance;
    }
    
    public static function fromUrl( $url ): PdfToImageConverter {
        $instance = new self();
        $instance->url = $url;
        
        return $instance;
    }
    
    public static function fromResource( $resource ): PdfToImageConverter {
        $instance = new self();
        rewind( $resource );
        $instance->resource = $resource;
        
        return $instance;
    }
    
    ////// CONFIG ///////
    
    public function page( $index ): PdfToImageConverter {
        $this->page = $index;
        
        return $this;
    }
    
    public function width( $width ): PdfToImageConverter {
        $this->width = $width;
        
        return $this;
    }
    
    
    ////// GET RESULT ///////
    
    public function toJpeg( $path = '' ) {
        $command = [
            self::$bin,
            "-jpeg",
            "-f",
            $this->page,
            "-l",
            $this->page,
            "-singlefile",
            "-antialias",
            "fast",
            "-scale-to",
            "800",
            "-",
            "-",
        ];
        $process = new Process( $command );
        $process->setInput( $this->getInput() );
        $process->run();
        $this->validProcess( $process );
        if ( $path ) {
            return file_put_contents( $path, $process->getOutput() );
        }
        
        return $process->getOutput();
    }
    
}

$url = "https://www.phdfood2019.it/wp-content/uploads/2019/05/APA_Guide_2017.pdf";
PdfToImageConverter::fromUrl( $url )->page(2)->toJpeg("output.png");