php read the contents of the file and write data to the file

php tutorial read the contents of the file and write data to the file Here is to talk about his party to write data to the file, but also his party read out the contents of the document.
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$ fp = fopen ($ _ server ['document_root']. "/../ data / info.dat", 'r');

if (! $ fp)
{
echo "<b> error: Error opening the file, please check the directory is correct, or try again later! </ b>";
exit
}

while (! feof ($ fp))
{
$ line = fgets ($ fp);
echo $ line;
echo ';
}
fclose ($ fp);

// write the file

$ file = "data.txt";
$ content = "content title rnwww.jzread.com second line of content"; // content to be written

if (! $ fp = fopen ($ file, 'a')) // Open the file $ file, use the additional mode, the file pointer at the beginning of the file
{
echo "Open file $ file failed!";
exit
}

if (fwrite ($ fp, $ content) === false) // Write the contents of the file
{
echo "failed to write to file!";
exit
}

echo "write file successfully!";
fclose ($ fp);