PHP에서 원격 이미지의 유효성을 체크하는 방법

< ?

function check_image($url) 
{
function check_image($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url );
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    $output = curl_exec($ch);
    curl_close($ch);

    $headers = array();
    foreach(explode("\n",$output) as $line){
        $parts = explode(':' ,$line);
        if(count($parts) == 2){
            $headers[trim($parts[0])] = trim($parts[1]);
        }

    }

    return isset($headers["Content-Type"]) && strpos($headers['Content-Type'], 'image/') === 0;
}
}
? >

< ?
if (check_image($image_url) == 1) {
    // 이미지 있음
} else {
    // 이미지 없음
}
?>

curl 이 설치되어 있지 않으면 에러가 발생한다.

아래참고. (우분투)

1 확인[편집]

php -m | grep curl
dpkg --get-selections | grep php | grep curl

root@zetawiki:~# php -m | grep curl
root@zetawiki:~# dpkg --get-selections | grep php | grep curl
root@zetawiki:~#

2 설치[편집]

# ubuntu14, php5
apt-get install php5-curl

# ubuntu16, php7
apt-get install php-curl

root@zetawiki:~# apt-get install php-curl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libcurl3 php7.0-curl
The following NEW packages will be installed:
  libcurl3 php-curl php7.0-curl
0 upgraded, 3 newly installed, 0 to remove and 37 not upgraded.
Need to get 215 kB of archives.
After this operation, 692 kB of additional disk space will be used.
Do you want to continue? [Y/n]

Get:1 http://kr.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libcurl3 amd64 7.47.0-1ubuntu2.2 [186 kB]
Get:2 http://kr.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-curl amd64 7.0.15-0ubuntu0.16.04.4 [27.4 kB]
Get:3 http://kr.archive.ubuntu.com/ubuntu xenial/main amd64 php-curl all 1:7.0+35ubuntu6 [1,930 B]
... (생략)
Setting up php-curl (1:7.0+35ubuntu6) ...
Processing triggers for libc-bin (2.23-0ubuntu7) ...
Processing triggers for php7.0-fpm (7.0.15-0ubuntu0.16.04.4) ...

3 확인 2[편집]

php -m | grep curl
dpkg --get-selections | grep php | grep curl

root@zetawiki:~# php -m | grep curl
curl
root@zetawiki:~# dpkg --get-selections | grep php | grep curl
php-curl					install
php7.0-curl					install