How to create multiple folders inside another folder using php? -

initially created folder name coming sql result stored in variable after creating folder want create 2 folders inside folder.so below 3 lines have written creating folders.

mkdir($r,0777,true);  //creating first folder without error mkdir($r/'input',0777,true);  // not able create folder inside first folder mkdir($r/'output',0777,true);  //not able create folder inside first folder 

$r/'input' not valid path here. it's not string, because you're doing arithmetic operation here. need put / string , concatenate $r using dot:

$r . '/input' 

the same output folder.

try do:

mkdir($r,0777,true);  mkdir($r . '/input',0777,true);   mkdir($r . '/output',0777,true);