In this tutorials I will show you how to read the file and write the file using php functions.
First make test.txt file and put some dummy content in that file.
Note: Make test.txt file group permission to 777 or writeable and readable.
<?php
$fp = fopen("test.txt","w");
while(!feof($fp))
{
$data = fgets($fp);
echo "alert($data);";
}
fwrite($fp, 'this is test text');
fclose($fp);
?>
Using following function You are able to check the file size.
$fp = fopen('test.txt', 'r');
echo $data = fread($fp, filesize('test.txt'));
fclose($fp);
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