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→PHP: PHP-FIG PSR |
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Line 69:
<?php
interface Image
{ public function displayImage();
}
// On System A
class RealImage implements Image
{ private string $filename = null;
/**
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* @param $filename
*/
public function __construct(string $filename)
{
$this->filename = $filename;
$this->loadImageFromDisk();
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* Loads the image from the disk
*/
private function loadImageFromDisk()
{
echo "Loading {$this->filename} \r\n";
}
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* Displays the image
*/
public function displayImage()
{
echo "Displaying {$this->filename} \r\n";
}
}
// On System B
class ProxyImage implements Image
{ private Image $image = null;
private string $filename = null;
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* @param $filename
*/
public function __construct(string $filename)
{
$this->filename = $filename;
}
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* Displays the image
*/
public function displayImage()
{
if ($this->image == null) {
$this->image = new RealImage($this->filename);
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$this->image->displayImage();
}
}
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