How can the filesize() function in PHP affect the reading and writing of file contents?

The filesize() function in PHP can affect the reading and writing of file contents by returning the size of a file in bytes. This information can be used to ensure that the correct amount of data is read or written to a file, preventing issues such as incomplete files or exceeding the file size limit. 

$file = 'example.txt';

$filesize = filesize($file);

// Read file contents
$contents = file_get_contents($file, NULL, NULL, 0, $filesize);

// Write file contents
file_put_contents($file, $contents, LOCK_EX);

Keywords

filesize() function PHP reading writing

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