PHP - Function rewind()

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The rewind() function can rewind the position of file pointer to the beginning of the file, and it can return true on success, or false on failure.

Syntax

bool rewind ( resource $handle )

This function can set the file position indicator for a handle to the beginning of the file stream. If we have opened a file in append ("a" or "a+") mode, any data we write to a file can always be appended, regardless of the file pointer position.

Example-1

<?php
   $handle = fopen("/PhpProject/sample.txt", "r+");

   fwrite($handle, "Long sentence");
   rewind($handle);
   fwrite($handle, "Hello PHP");
   rewind($handle);
 
   echo fread($handle, filesize("/PhpProject/sample.txt"));
   fclose($handle);
?>

Output

Hello PHPence

Example-2

<?php
   $file = fopen("/PhpProject/sample.txt", "r");

   fseek($file, "15");  // Change the position of file pointer
   rewind($file);  // Set the file pointer to 0
   
   fclose($file);
?>