ftruncate() function in PHP

ftruncate() function truncates the open file to the specified length. The function returns TRUE on success and FALSE on failure.

Syntax

ftruncate(file_pointer, size)

Parameters

• file_pointer - The file pointer must be open for truncation to be written.

• size - The size of the file to truncate.

Return

ftruncate() function returns.

• TRUE if successful,
• FALSE if failed.

Example

<?php
   echo filesize("new.txt");
   echo " ";
   $file_pointer = fopen("new.txt", "a+");
   ftruncate($file_pointer, 50);
   // close file
   fclose($file_pointer);
   // clear
   clearstatcache();
   // check file size again
   echo filesize("new.txt");
   // close file
   fclose($file_pointer);
?>

Output

400
50

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