<?php
function writefile("text.txt","$testVariable","a+")
{
$fp = fopen($filename, $mode);
fwrite($fp, $data);
fclose($fp);
}
?>
you have to set the mode to w+, not a+.
<?php
function writeFile($filename, $data, $mode)
{
$fp = fopen($filename, $mode);
fwrite($fp, $data);
fclose($fp);
}
?>
that should be your function. Then just do
<?php
writeFile("filename.txt", "thank you alex for your help, I love you", "w+");
?>