How to check whether an image (physical file) exists on an external web server via an absolute URL

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I usually use the function file_exists of PHP to do this when I am developing remotely, but now I need to know when the image exists or not in a URL absolute of an external web server.

Editing the question to include more information:

I tested all these methods both on the local server and on a web server other than www.issam.com.br and none returns the correct value, someone knows whether it is possible?

Imagem que existe = http://www.issam.com.br/ximages/produtos/356031.jpg
Imagem que não existe = http://www.issam.com.br/ximages/produtos/356030.jpg

if(file_exists('http://www.issam.com.br/ximages/produtos/356030.jpg')){
   echo"sim";
}else{
  echo"nao";
}


if(file_get_contents('http://www.issam.com.br/ximages/produtos/356030.jpg')) {
   echo "Existe";
}else{
   echo"nao";
}

$arquivo = 'http://www.issam.com.br/ximages/produtos/356030.jpg';
$file_headers = @get_headers($arquivo);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
   echo 'Arquivo não existe.';
}else {
echo 'Arquivo existe.';
}

$arquivo = 'http://www.issam.com.br/ximages/produtos/356030.jpg';
if (!$fp = curl_init($arquivo)){
   echo 'Arquivo não existe.';
}else{
    echo 'Arquivo existe.';
}
php

2 answers

3


You can do it in many ways.

In addition to the option quoted by @Lucas Caires, it could be...

Using get_headers:

$arquivo = 'http://www.seu_dominio.com.br/seu_caminho/absoluto/arquivo.jpg';
$file_headers = @get_headers($arquivo);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
    echo 'Arquivo não existe.';
}else {
     echo 'Arquivo existe.';
}

Using CURL:

$arquivo = 'http://www.seu_dominio.com.br/seu_caminho/absoluto/arquivo.jpg';
if (!$fp = curl_init($arquivo)){
   echo 'Arquivo não existe.';
}else{
   echo 'Arquivo existe.';
}

NOTE: These two options are interesting as they do not download the complete file. Getting much faster.

I hope I’ve helped

  • 2

    PLEASE SEARCH IF THERE ARE NO ANSWERS ON THE SITE THAT ANSWER ANY QUESTIONS, I AM VERY GRATEFUL IF YOU FAVOUR THE EXISTING ANSWERS http://answall.com/q/1819/3635

  • Obs: was not me who denied your answer, but I have already guided you more than once on how to mark the question as duplicate

  • 1

    @Guilhermenascimento... thank you once again for your attention. I will endeavor not to answer before checking.

  • It is not duplicated because the question is for external servers and not own or remote server as Kenny Rafael’s answer says. I had already tried this answer but it does not work. I will try these of friends Lucas Caires and Allan Andrade.

  • Denis, let me know if it works.

  • @Remote server and external server Denis is pretty much the same thing, what do you mean by absolute URL? Would that be it /home/user/teste/image.jpg or would that be http://siteexterno.com/image;jpg or would that be smb://shared/image.jpg. Please find more details.

  • Soon testo Allan. Guilherme would be http://siteexterno.com/image.jpg I tested with file_exists and it didn’t work.

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0

You can use the function file_get_contents() for that reason.

<?php
if(file_get_contents('http://www.exemplo.com.br/imagem.jpg')) {
 echo "Existe";
}
?>

Remembering for this function to work, you will need to activate the allow_url_fopen in php.ini. If you cannot activate this, there is an alternative to using the Curl library. Here is an example of use.

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