The fwrite() function writes to an open file. It returns the number of bytes written on success, whereas returns False on failure.
Syntax
fwrite(file_pointer, string, length)
Parameters
file_pointer − A file system pointer created using fopen(). Required.
string − The string to be written. Required.
length − Maximum number of bytes to be written. Optional.
Return
The fwrite() function returns the number of bytes written on success, whereas returns False on failure.
Example
<?php
$file_pointer = fopen("new.txt","w");
echo fwrite($file_pointer,"This is test string!");
fclose($file);
?>Output
20