PHP fseek() Function

PHP fseek Function


Defintion : 
The fseek() function seeks in an open file.

This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.

Tip: You can find the current position by using ftell()!

Syntax

  fseek(file, offset, whence)

Parameter
Parameter Description
file Required. Specifies the open file to seek in
offset Required. Specifies the new position (measured in bytes from the beginning of the file)
whence Optional. Possible values:
  • SEEK_SET - Set position equal to offset. Default
  • SEEK_CUR - Set position to current location plus offset
  • SEEK_END - Set position to EOF plus offset (to move to a position before EOF, the offset must be a negative value)

Example:
Lets assume that we have a file called demo.txt. This file contains following content:

This is a demo file.
It contains dummy content.


Below example Read first line from the open file, then move the file pointer back to the beginning of the file:

Output : This is a demo file.