PHP fseek() Function

In this chapter you will learn:

1. Definition for PHP fseek() Function
2. Syntax for PHP fseek() Function
3. Parameter for PHP fseek() Function
4. Return for PHP fseek() Function
5. Example - fseek() moves a file handle pointer to an arbitrary position

Definition

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

Syntax

PHP fseek() Function has the following syntax.

Parameter

Possible values for whence:

• 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

This function returns 0 on success, or -1 on failure. Seeking past EOF will not generate an error.

Example

fseek() moves a file handle pointer to an arbitrary position.

<?PHP//ja  va 2 s.com
      $filename = "c:/abc/test.txt";
      $handle = fopen($filename, "w+");
      fwrite($handle, "java2s.com\n");
      rewind($handle);
      fseek($handle, 1);
      fwrite($handle, "o");
      fseek($handle, 2, SEEK_CUR);
      fwrite($handle, "e");
      fclose($handle);
?>

The first byte of a file is byte 0, and you count upward from there. The second byte is at index 1, the third at index 2, etc.

Find the current position by using ftell().

Next chapter...

What you will learn in the next chapter:

1. Definition for PHP fstat() Function
2. Syntax for PHP fstat() Function
3. Parameter for PHP fstat() Function
4. Return for PHP fstat() Function
5. Note on PHP fstat() Function
6. Example - returns information about an open file

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