PHP Reference
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Quick Reference

The PHP fseek() function seeks in an open file by moving the file pointer from its current position to a new position, forward or backward, in bytes.

<?php
$file = fopen('test.txt', 'r');

// read first line
echo fgets($file);

// move back to beginning of the file
fseek($file, 0);

fclose($file);
?>

Output

// reads the first line from the open file and then move the file pointer to the beginning of the file

Syntax

fseek(file, offset, whence)

Parameters

ParameterDescription
fileSpecifies the open file to seek in (required)
offsetSpecifies the new position in bytes from the beginning of the file (required)
whencePossible 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)

PHP Notes:

  • When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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