PHP File IO Opening a file

1
PHP File IO Opening a file

• Use the resource fopen( )
• Resource fopen ( string filename, string mode)
• filename name of file
• mode read, write, append

2
PHP File IO Opening a file

• fopen( ) associates a resource, specified by
  filename, to a stream
• If filename is of the form "scheme//...", it is
  assumed to be a URL and PHP will search for a
  protocol handler for that scheme
• If PHP has decided that filename specifies a
  local file, then it will try to open a stream on
  that file
• The file must be accessible to PHP ? file needs
  appropriate access permissions

3
PHP File IO Opening a file mode

• r ? read only
• r ? read and write
• w ? write only
• w ? write and read
• a ? append only
• a ? append and read

4
PHP File IO - Reading

• Open a file
• fp fopen("test.txt","r")
• // read 10 bytes
• contents fread(fp, 10)
• fclose(fp)

5
PHP File IO - Reading

• Open a file
• fp fopen("test.txt","r")
• // Read the whole file
• contents fread(fp, filesize("test.txt"))
• fclose(fp)

6
PHP File IO - Writing

• handle fopen("test2.txt", "w")
• written fwrite(handle, "hi php")
• echo "written bytes writtenltbrgt"
• fclose(handle)

7
PHP File IO - Appending

• handle fopen("test2.txt", "a")
• written fwrite(handle, "appending\n")
• echo "written bytes writtenltbrgt"
• fclose(handle)