html - PHP Error - All Files or Directories created are 0 -


i coding registration script , wanted create folder inside folder called "users". somehow, folder created in root path (where php script located) , files, supposed written inside folder in file called 0. here's code:

if (!isset($_post["method"])){                 die("error");             }             if (!isset($_post["usernamefld"])){                 die("error");             }             if (!isset($_post["passwordfld"])){                 die("error");             }             if ($_post["method"] == "register"){                 if (!isset($_post["emailfld"])){                     die("error");                 }                  if(is_dir("./users/"+$_post["usernamefld"])){                     die("taken");                 }                  mkdir("/users/"+$_post["usernamefld"]);                 echo "test";                }

the folder "0" empty when created.

as @u_mulder has stated, in php concat strings , variables "." , not "+" symbol. based on that, should particular issue.

if (!isset($_post["method"])){     die("error"); } if (!isset($_post["usernamefld"])){     die("error"); } if (!isset($_post["passwordfld"])){     die("error"); }  if ($_post["method"] == "register"){     if (!isset($_post["emailfld"])){         die("error");     }      if(is_dir("./users/". $_post["usernamefld"])){         die("taken");     }      mkdir("/users/". $_post["usernamefld"]);     echo "test";  }

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