PHP fseek() Function

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

<?php
$file = fopen("test.txt","r");
// Read first line
echo fgets($file);
// Move back to beginning of file
fseek($file,0);
fclose($file);
?>

Definition and Usage

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()!

fseek(file, offset, whence)

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)

Return Value:	0 on success, otherwise -1
PHP Version:	4.0+