fseek

Name:fseek

Category:File system

Programming Language:php

One-line Description:Locate in the open file.

Definition and usage

fseek() function is located in the open file.

This function moves the file pointer forward or backward from the current position to a new position, which starts at the file header by the number of bytes.

If successful, return 0; otherwise, return -1. Note that no error occurs when moving to the position after EOF.

Example

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

// Read the first line
fgets ( $file ) ;

// Rewind back to the beginning of the file
fseek ( $file , 0 ) ;
?>

grammar

 fseek ( file , offset , when )

parameter	describe
file	Required. Specify the files to be located in it.
offset	Required. Specifies a new location (measured by bytes starting from the file header).
when	Optional. Possible values: SEEK_SET - Set position equal to offset bytes. default. SEEK_CUR - Set the position to the current position plus offset . SEEK_END - Set the position to add offset to the end of the file (to move to the position before the end of the file, offset must be a negative value).