When I use to following PHP code;
<?php if (file_exists("/foto/Maurice.jpg"))
{
echo "<center><img src='/foto/Maurice.jpg'/></center>";
}
else {
echo "<center><img src='/afbeeldingen/kaars1.png'/></center>";
?>
My browser always shows kaars1.png
instead of Maurice.jpg
I also tried !file_exists but then it doesn't show kaars1.png, when Maurice.jpg doesn't exist.
Is there a simpel way to fix this?
file_exists is only for files on your server's (local) filesystem. You need to actually try to request the URL and see if it exists or not.
You can use cURL to do this.
$handle = curl_init('https://picathartes.com/foto/Maurice.jpg');
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle, CURLOPT_NOBODY, TRUE);
$response = curl_exec($handle);
// Check for 404 (file not found).
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 404) {
echo "<center><img src='https://picathartes.com/afbeeldingen/kaars1.png'/></center>";
}
else{
echo "<center><img src='https://picathartes.com/foto/Maurice.jpg'/></center>";
}
curl_close($handle);
(Code from this question: https://stackoverflow.com/a/408416)
This is an answer to your second question
The correct solution depends upon your actual directory structure and the location of the script file in relation to the actual folder and file you are looking for, but to start finding a solution the / in "/foto/Maurice.jpg" say go back to the root directory and look for a directory called /foto
So if this folder is under your DocumentRoot try using
if (file_exists("foto/Maurice.jpg"))
I have this piece of code in PHP:
if (file_exists($_POST['current_folder'])) {
//do something
}
But file_exists always returns false. The value passed to the function is:
echo $_POST['current_folder']); //This prints: http://localhost/wordpress/wp-content/music
I also tried with different folders on the localhost. The function always returns false.
I also tried is_dir(). But even this function returns false with the above URL.
There are many related questions on Stack Overflow. But most of them suggest that file_exists only works with relative URLs. But from this link it is clear that http:// URLs are also supported by the file_exists function.
What am I missing?
Use directory path; not web URL:
<?php
$filename = '/path/to/foo.txt';
if (file_exists($filename)) {
echo "The file $filename exists";
} else {
echo "The file $filename does not exist";
}
?>
Tested under windows using Apache 2.4.9.
<?PHP
$crl = curl_init("http://localhost/symfony2/");
curl_setopt($crl, CURLOPT_NOBODY, true);
curl_exec($crl);
$ret = curl_getinfo($crl, CURLINFO_HTTP_CODE);
curl_close($crl);
if ($ret == 200)
echo 'File exists';
else
echo 'File does not exist';
?>
It works, just a note, it requires trailing slash for some reason.
Code 200 means OK (success).
I have a website on http://www.reelfilmlocations.co.uk
The above site has an admin area where images are uploaded and different size copies created in subfolders of an uploads/images directory.
I am creating a site for mobile devices, which will operate on a sub-domain, but use the database and images from the main domain,
http://2012.reelfilmlocations.co.uk
I want to be able to access the images that are on the parent domain, which i can do by linking to the image with the full domain i.e http:www.reelfilmlocations.co.uk/images/minidisplay/myimage.jpg
Though i need to check if the image exists first...
I have a php function that checks if the images exists, if it does it returns the full url of the image.
If it doesn't exist i want to return the path of a placeholder image.
The following function i have, returns the correct image if it exists, but if it doesn't, it is just returning the path to the directory where the placeholder image resides i.e http://www.reelfilmlocations.co.uk/images/thumbs/. without the no-image.jpg bit.
The page in question is: http://2012.reelfilmlocations.co.uk/browse-unitbases/
the code i have on my page to get the image is:
<img src="<?php checkImageExists('/uploads/images/thumbs/', $row_rs_locations['image_ubs']);?>">
My php function:
if(!function_exists("checkImageExists")){
function checkImageExists($path, $file){
$imageName = "http://www.reelfilmlocations.co.uk".$path.$file;
$header_response = get_headers($imageName, 1);
if(strpos($header_response[0], "404" ) !== false ){
// NO FILE EXISTS
$imageName = "http://www.reelfilmlocations.co.uk".$path."no-image.jpg";
}else{
// FILE EXISTS!!
$imageName = "http://www.reelfilmlocations.co.uk".$path.$file;
}
echo($imageName);
}
}
Failing to get this to work i did some digging around and read some posts about curl:
This just returns a placeholder image everytime.
if(!function_exists("remoteFileExists")){
function remoteFileExists($url) {
$curl = curl_init($url);
//don't fetch the actual page, you only want to check the connection is ok
curl_setopt($curl, CURLOPT_NOBODY, true);
//do request
$result = curl_exec($curl);
$ret = false;
//if request did not fail
if ($result !== false) {
//if request was ok, check response code
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode == 200 ) {
$ret = true;
}
}
curl_close($curl);
return $ret;
}
}
if(!function_exists("checkImageExists")){
function checkImageExists($path, $file){
$imageName = "http://www.reelfilmlocations.co.uk".$path.$file;
$exists = remoteFileExists($imageName);
if ($exists){
// file exists do nothing we already have the correct $imageName
} else {
// file does not exist so set our image to the placeholder
$imageName = "http://www.reelfilmlocations.co.uk".$path."no-image.jpg";
}
echo($imageName);
}
}
I dont know if it could be to do with getting a 403, or how to check if this is the case.
any pointers or things i could try woud be greatly appreciated.
I'd do it using CURL, issuing a HEAD request and checking the response code.
Not tested, but should do the trick:
$URL = 'sub.domain.com/image.jpg';
$res = `curl -s -o /dev/null -IL -w "%{http_code}" http://$URL`;
if ($res == '200')
echo 'Image exists';
The code above will populate $res with status code of the requisition (pay attention that I DON'T include the http:// prefix to the $URL variable because I do it in the command line.
Of course the same might be obtained using PHP's CURL functions, and the above call might not work on your server. I am just explaining what I'd be doing if I had the same need.
<?php
set_time_limit(0);
$url = 'http://www.some.url/file.pdf';
$path = 'files/file.pdf';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
curl_close($ch);
file_put_contents($path, $data);
?>
This is the code that I use to download a particular pdf file froma given url.
What if there a many files in that url by names file1.pdf, file2.pdf etc. How can I check while running a loop, when to end the loop as the files will be present up to a limited number ?
Please help!
Checking for 404 code:
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 404) {
/* file NOT found */
}
Checking mime type:
$mimeType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
if($mimeType == 'application/pdf') {
/* It IS pdf file */
}
But note, that mime type can be other, but it'll be still PDF file! Also, check mime type by your PDF files: echo them to understand what u must look for. I'm not rly sure, that code in if statement is right (it is example only)
You can call curl_get_info() right after curl_exec().
pass image link inside file_get_contents();
then check using preg_match();
<?php $link = $image->img1;
$filecontent=file_get_contents($link);
if(preg_match("/^%PDF-1.5/", $filecontent)){
echo "Valid pdf";
}else{
echo "In Valid pdf";
}
?>
You can also check: to get last three character of your file
<?php
$img_type = substr($image->img1, -3); ?>
<?php if(preg_match("/^%PDF-1.5/", $filecontent) || $img_type == 'pdf' ){ }?>
I need to see if a specific image exists on my cdn.
I've tried the following and it doesn't work:
if (file_exists(http://www.example.com/images/$filename)) {
echo "The file exists";
} else {
echo "The file does not exist";
}
Even if the image exists or doesn't exist, it always says "The file exists". I'm not sure why its not working...
You need the filename in quotation marks at least (as string):
if (file_exists('http://www.mydomain.com/images/'.$filename)) {
… }
Also, make sure $filename is properly validated. And then, it will only work when allow_url_fopen is activated in your PHP config
if (file_exists('http://www.mydomain.com/images/'.$filename)) {}
This didn't work for me. The way I did it was using getimagesize.
$src = 'http://www.mydomain.com/images/'.$filename;
if (#getimagesize($src)) {
Note that the '#' will mean that if the image does not exist (in which case the function would usually throw an error: getimagesize(http://www.mydomain.com/images/filename.png) [function.getimagesize]: failed) it will return false.
Try like this:
$file = '/path/to/foo.txt'; // 'images/'.$file (physical path)
if (file_exists($file)) {
echo "The file $file exists";
} else {
echo "The file $file does not exist";
}
Well, file_exists does not say if a file exists, it says if a path exists. ⚡⚡⚡⚡⚡⚡⚡
So, to check if it is a file then you should use is_file together with file_exists to know if there is really a file behind the path, otherwise file_exists will return true for any existing path.
Here is the function i use :
function fileExists($filePath)
{
return is_file($filePath) && file_exists($filePath);
}
Here is the simplest way to check if a file exist:
if(is_file($filename)){
return true; //the file exist
}else{
return false; //the file does not exist
}
A thing you have to understand first: you have no files.
A file is a subject of a filesystem, but you are making your request using HTTP protocol which supports no files but URLs.
So, you have to request an unexisting file using your browser and see the response code. if it's not 404, you are unable to use any wrappers to see if a file exists and you have to request your cdn using some other protocol, FTP for example
If the file is on your local domain, you don't need to put the full URL. Only the path to the file. If the file is in a different directory, then you need to preface the path with "."
$file = './images/image.jpg';
if (file_exists($file)) {}
Often times the "." is left off which will cause the file to be shown as not existing, when it in fact does.
public static function is_file_url_exists($url) {
if (#file_get_contents($url, 0, NULL, 0, 1)) {
return 1;
}
return 0;
}
There is a major difference between is_file and file_exists.
is_file returns true for (regular) files:
Returns TRUE if the filename exists and is a regular file, FALSE otherwise.
file_exists returns true for both files and directories:
Returns TRUE if the file or directory specified by filename exists; FALSE otherwise.
Note: Check also this stackoverflow question for more information on this topic.
You have to use absolute path to see if the file exists.
$abs_path = '/var/www/example.com/public_html/images/';
$file_url = 'http://www.example.com/images/' . $filename;
if (file_exists($abs_path . $filename)) {
echo "The file exists. URL:" . $file_url;
} else {
echo "The file does not exist";
}
If you are writing for CMS or PHP framework then as far as I know all of them have defined constant for document root path.
e.g WordPress uses ABSPATH which can be used globally for working with files on the server using your code as well as site url.
Wordpress example:
$image_path = ABSPATH . '/images/' . $filename;
$file_url = get_site_url() . '/images/' . $filename;
if (file_exists($image_path)) {
echo "The file exists. URL:" . $file_url;
} else {
echo "The file does not exist";
}
I'm going an extra mile here :). Because this code would no need much maintenance and pretty solid, I would write it with as shorthand if statement:
$image_path = ABSPATH . '/images/' . $filename;
$file_url = get_site_url() . '/images/' . $filename;
echo (file_exists($image_path))?'The file exists. URL:' . $file_url:'The file does not exist';
Shorthand IF statement explained:
$stringVariable = ($trueOrFalseComaprison > 0)?'String if true':'String if false';
you can use cURL. You can get cURL to only give you the headers, and not the body, which might make it faster. A bad domain could always take a while because you will be waiting for the request to time-out; you could probably change the timeout length using cURL.
Here is example:
function remoteFileExists($url) {
$curl = curl_init($url);
//don't fetch the actual page, you only want to check the connection is ok
curl_setopt($curl, CURLOPT_NOBODY, true);
//do request
$result = curl_exec($curl);
$ret = false;
//if request did not fail
if ($result !== false) {
//if request was ok, check response code
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode == 200) {
$ret = true;
}
}
curl_close($curl);
return $ret;
}
$exists = remoteFileExists('http://stackoverflow.com/favicon.ico');
if ($exists) {
echo 'file exists';
} else {
echo 'file does not exist';
}
You can use the file_get_contents function to access remote files. See http://php.net/manual/en/function.file-get-contents.php for details.
If you are using curl, you can try the following script:
function checkRemoteFile($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
// don't download content
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
if(curl_exec($ch)!==FALSE)
{
return true;
}
else
{
return false;
}
}
Reference URL: https://hungred.com/how-to/php-check-remote-email-url-image-link-exist/
try this :
if (file_exists(FCPATH . 'uploads/pages/' . $image)) {
unlink(FCPATH . 'uploads/pages/' . $image);
}
If path to your image is relative to the application root it is better to use something like this:
function imgExists($path) {
$serverPath = $_SERVER['DOCUMENT_ROOT'] . $path;
return is_file($serverPath)
&& file_exists($serverPath);
}
Usage example for this function:
$path = '/tmp/teacher_photos/1546595125-IMG_14112018_160116_0.png';
$exists = imgExists($path);
if ($exists) {
var_dump('Image exists. Do something...');
}
I think it is good idea to create something like library to check image existence applicable for different situations. Above lots of great answers you can use to solve this task.
Here is one function that I use to check any kind of URL. It will check response code is URL exists or not.
/*
* Check is URL exists
*
* #param $url Some URL
* #param $strict You can add it true to check only HTTP 200 Response code
* or you can add some custom response code like 302, 304 etc.
*
* #return string or NULL
*/
function is_url_exists($url, $strict = false)
{
if (is_int($strict) && $strict >= 100 && $strict < 600 || is_array($strict)) {
if(is_array($strict)) {
$response = $strict;
} else {
$response = [$strict];
}
} else if ($strict === true || $strict === 1) {
$response = [200];
} else {
$response = [200,202,301,302,303];
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$return = curl_exec($ch);
if (!curl_errno($ch) && $return !== false) {
return ( in_array(curl_getinfo($ch, CURLINFO_HTTP_CODE), $response) !== false );
}
return false;
}
This is exactly what you need.
Read first 5 bytes form HTTP using fopen() and fread() then use this:
DEFINE("GIF_START","GIF");
DEFINE("PNG_START",pack("C",0x89)."PNG");
DEFINE("JPG_START",pack("CCCCCC",0xFF,0xD8,0xFF,0xE0,0x00,0x10));
to detect image.
file_exists reads not only files, but also paths. so when $filename is empty, the command would run as if it's written like this:
file_exists("http://www.example.com/images/")
if the directory /images/ exists, the function will still return true.
I usually write it like this:
// !empty($filename) is to prevent an error when the variable is not defined
if (!empty($filename) && file_exists("http://www.example.com/images/$filename"))
{
// do something
}
else
{
// do other things
}
file_exists($filepath) will return a true result for a directory and full filepath, so is not always a solution when a filename is not passed.
is_file($filepath) will only return true for fully filepaths
you need server path with file_exists
for example
if (file_exists('/httpdocs/images/'.$filename)) {echo 'File exist'; }
if(#getimagesize($image_path)){
...}
Is working for me.
Try it:
$imgFile = 'http://www.yourdomain.com/images/'.$fileName;
if (is_file($imgFile) && file_exists($imgFile)) {
echo 'File exists';
} else {
echo 'File not exist';
}
Another Way:
$imgFile = 'http://www.yourdomain.com/images/'.$fileName;
if (is_file($imgFile)) {.....
}