curl exec always returns false

Question

I have written this simple piece of code     ch   curl init       Set options curl setopt  ch  CURLOPT URL   http   www php net    curl setopt  ch  CURLOPT RETURNTRANSFER  1    website content   curl exec   ch     In my case  website content comes as false  Can anyone suggest advice something what could be going wrong

User · Answer

This happened to me yesterday and in my case was because I was following a PDF manual to develop some module to communicate with an API and while copying the link directly from the manual, for some odd reason, the hyphen from the copied link was in a different encoding and hence the curl_exec() was always returning false because it was unable to communicate with the server.

It took me a couple hours to finally understand the diference in the characters bellow:

https://www.e-example.com/api
https://www.e-example.com/api

Every time I tried to access the link directly from a browser it converted to something likehttps://www.xn--eexample-0m3d.com/api.

It may seem to you that they are equal but if you check the encoding of the hyphens here you'll see that the first hyphen is a unicode characters U+2010 and the other is a U+002D.

Hope this helps someone.

User · Answer

In my case I need to set VERIFYHOST and VERIFYPEER to false  like this   curl setopt  ch  CURLOPT SSL VERIFYHOST  FALSE   curl setopt  ch  CURLOPT SSL VERIFYPEER  FALSE     before the call to curl exec  ch    Because i am working between two development environments with self-assigned certificates  With valid certificates there is no need to set VERIFYHOST and VERIFYPEER to false because the curl exec  ch  method will work and return the response you expect

User · Answer

Error checking and handling is the programmer s friend  Check the return values of the initializing and executing cURL functions  curl error   and curl errno   will contain further information in case of failure   try        ch   curl init            Check if initialization had gone wrong          if   ch     false            throw new Exception  failed to initialize               curl setopt  ch  CURLOPT URL   http   example com         curl setopt  ch  CURLOPT RETURNTRANSFER  1       curl setopt                   content   curl exec  ch           Check the return value of curl exec    too     if   content     false            throw new Exception curl error  ch   curl errno  ch                  Process  content here            Close curl handle     curl close  ch     catch Exception  e         trigger error sprintf           Curl failed with error   d   s            e- gt getCode     e- gt getMessage             E USER ERROR            The curl init   manual states      Returns a cURL handle on success  FALSE on errors    I ve observed the function to return FALSE when you re using its  url parameter and the domain could not be resolved  If the parameter is unused  the function might never return FALSE  Always check it anyways  though  since the manual doesn t clearly state what  errors  actually are

[php] curl_exec() always returns false

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