$fp = fopen("Report.doc", 'w+');
The fopen() function is used to open files in PHP.
The first parameter of this function contains the name of the file to be opened and the second parameter specifies in which mode the file should be opened:
| Modes | Description | 
|---|---|
| r | Read only. Starts at the beginning of the file | 
| r+ | Read/Write. Starts at the beginning of the file | 
| w | Write only. Opens and clears the contents of file; or creates a new file if it doesn’t exist | 
| w+ | Read/Write. Opens and clears the contents of file; or creates a new file if it doesn’t exist | 
| a | Append. Opens and writes to the end of the file or creates a new file if it doesn’t exist | 
| a+ | Read/Append. Preserves file content by writing to the end of the file | 
| x | Write only. Creates a new file. Returns FALSE and an error if file already exists | 
| x+ | Read/Write. Creates a new file. Returns FALSE and an error if file already exists. | 
$str="welcome";  add file content to $str.fwrite($fp, $str);
fclose($fp); 
write data into file and finally close the file.
Final Code : 
$fp = fopen("reports/Assign_Report.doc", 'w+');
$str ='welcome';
fwrite($fp, $str);
fclose($fp);   
  

The concept is explained well. The script implemented is also easy to follow. Thanks for adding here.
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