PHP How to check if image file exists

Question

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

User · Answer

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

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public static function is file url exists  url            if   file get contents  url  0  NULL  0  1                 return 1                     return 0

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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

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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

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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   amp  amp  file exists  http   www example com images  filename             do something   else          do other things

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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   amp  amp  file exists  filePath

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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

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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

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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

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if  getimagesize  image path            Is working for me

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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

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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

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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

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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

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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  gt  0   String if true   String if false

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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           amp  amp  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

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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

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try this         if  file exists FCPATH    uploads pages      image         unlink FCPATH    uploads pages      image

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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

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you need server path with file exists  for example  if  file exists   httpdocs images    filename    echo  File exist

[php] PHP: How to check if image file exists?

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