pdf_load_source example

/* * Even though Imagick uses less PHP memory than GD, set higher limit * for users that have low PHP.ini limits. */
        wp_raise_memory_limit( 'image' );

        try {
            $this->image    = new Imagick();
            $file_extension = strtolower( pathinfo( $this->file, PATHINFO_EXTENSION ) );

            if ( 'pdf' === $file_extension ) {
                $pdf_loaded = $this->pdf_load_source();

                if ( is_wp_error( $pdf_loaded ) ) {
                    return $pdf_loaded;
                }
            } else {
                if ( wp_is_stream( $this->file ) ) {
                    // Due to reports of issues with streams with `Imagick::readImageFile()`, uses `Imagick::readImageBlob()` instead.                     $this->image->readImageBlob( file_get_contents( $this->file ), $this->file );
                } else {
                    $this->image->readImage( $this->file );
                }
            }