Read, write and upload files.
✍️ 2 exercises in this lessonfile_put_contents($file, $data): write a file (add FILE_APPEND to append).file_get_contents($file): read a whole file.file($file): read lines into an array.file_exists(), unlink() (delete), mkdir()fopen(), fgets(), fwrite(), fclose() for line-by-line work on big files.Uploaded files arrive in $_FILES; move them with move_uploaded_file() after checking size and type.
Mastering PHP File Handling helps you write clean and reliable PHP code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<?php
$file = "notes.txt";
file_put_contents($file, "Line 1\n");
file_put_contents($file, "Line 2\n", FILE_APPEND);
echo nl2br(file_get_contents($file));
echo "Lines: " . count(file($file)) . "<br>";
unlink($file);
var_dump(file_exists($file));Line 1 Line 2 Lines: 2 bool(false)
Check what you learned in “PHP File Handling”.
Read a whole file into a string.
$text = ("notes.txt");
Which function deletes a file?
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