1-Usage.php

<?php

$file = new Core\File\RemoteFile('http://bestclipartblog.com/clipart-pics/food-clip-art-6.png');

// Check if exists:
var_dump($file->exists());// bool(true)

// Get HTTP Status Code
var_dump($file->getHttpStatus()); // int(200)

// Content Length (in bytes)
var_dump($file->getContentLength()); // int(79157)

// Get the file content as a string
$file->getContent();

RemoteFile.php

<?php

namespace Core\File;

use DomainException;
use RuntimeException;

/**
 * Class RemoteFile
 * @package Core\File
 */
class RemoteFile
{
    /**
     * @var string
     */
    protected $url;

    /**
     * @param string $url
     */
    public function __construct($url)
    {
        $this->setUrl($url);
    }

    /**
     * Gets the Url.
     * @return string
     */
    public function getUrl()
    {
        return $this->url;
    }

    /**
     * Validates, then sets the Url.
     * @param $url
     * @return $this
     */
    public function setUrl($url)
    {
        if (! filter_var($url, FILTER_VALIDATE_URL)) {
            throw new DomainException('Invalid Url: '.$url);
        }
        $this->url = $url;

        return $this;
    }

    /**
     * Checks if the remote file exists.
     * @return bool
     */
    public function exists()
    {
        $statusCode = $this->getHttpStatus();

        return $statusCode >= 200 && $statusCode < 400;
    }

    /**
     * Gets the HTTP Status Code of the Url.
     * @return int
     */
    public function getHttpStatus()
    {
        $ch = $this->getCurl();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_NOBODY, true);
        curl_exec($ch);
        $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        return (int) $status;
    }

    /**
     * Gets the content length of the Url (in bytes).  Returns -1 on failure.
     * @return int
     */
    public function getContentLength()
    {
        $fileSize = -1;
        $ch = $this->getCurl();

        // Issue a HEAD request.
        curl_setopt($ch, CURLOPT_NOBODY, 1);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

        $response = curl_exec($ch);
        if ($response === false) {
            throw new RuntimeException(curl_error($ch));
        }
        curl_close($ch);

        $contentLength = -1;
        $status = -1;

        if (preg_match("/^HTTP\/1\.[01] (\d\d\d)/", $response, $matches)) {
            $status = (int) $matches[1];
        }

        if (preg_match("/Content-Length: (\d+)/", $response, $matches)) {
            $contentLength = (int) $matches[1];
        }

        if ($status == 200 || ($status > 300 && $status <= 308)) {
            $fileSize = $contentLength;
        }

        return $fileSize;
    }

    /**
     * Get the contents of the URL.
     * @param array $curlOptions
     * @return string
     */
    public function getContents($curlOptions = [])
    {
        $ch = $this->getCurl();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);

        // Curl Option overrides
        foreach ($curlOptions as $option => $value) {
            curl_setopt($ch, $option, $value);
        }

        $response = curl_exec($ch);
        if (curl_errno($ch)) {
            throw new DomainException(curl_error($ch));
        }
        curl_close($ch);

        return $response;
    }

    /**
     * Gets the Curl Handle
     * @return resource
     */
    protected function getCurl()
    {
        return curl_init($this->getUrl());
    }
}