fopen and file_get_contents in php are the commonly used methods for file handling. While both of them can read the file but they serve different purposes and different performance characteristics especially when dealing with large files and streams.
fopen and file_get_contents in php
file_get_contents()
- Reads an entire file into a string
- Returns the file content or false on failure
- Convenient for small files or when you need the entire content at once.
$content = file_get_contents('example.txt');
echo $content;fopen()
- Opens a file and returns a stream resource
- Works with different modes: read (
r), write (w), append (a), binary (b), etc. - Allows streaming data in chunks rather than loading everything into memory.
$handle = fopen('example.txt', 'r');
while (!feof($handle)) {
$line = fgets($handle); // Read line by line
echo $line;
}
fclose($handle);Read more about fopen.
Memory Usage
- file_get_contents() loads entire file into memory. So, this is problematic for large files.
- fopen() allow reading in chunks. Memory efficient for large file or streams.
Use cases
file_get_contents()
- Small files (less than a few MBs)
- Quick scripts
- Reading JSON, text, or configs
- Example: Fetching a URL content
$json = file_get_contents('https://api.example.com/data.json');
$data = json_decode($json, true);fopen()
- Large files
- Uploading or downloading files
- Streaming data from API
- Example: Stream a backup file
$source = fopen('backup.sql', 'r');
$dest = fopen('storage/backup.sql', 'wb');
stream_copy_to_stream($source, $dest);
fclose($source);
fclose($dest);Read more on php.
