? File Open or Read in PHP

In PHP, you can open and read files using built-in functions like fopen(), fread(), fgets(), and file_get_contents(). This is useful for processing logs, text files, or displaying stored content.

? 1. Open and Read Entire File – fopen() + fread()

<?php$file = fopen("example.txt", "r") or die("Unable to open file!");$content = fread($file, filesize("example.txt"));fclose($file);echo $content;?>

? Explanation:

• "r" = Open for reading only

• filesize() = Gets file size to read full content

• fclose() = Closes the file after reading

? 2. Read File Line-by-Line – fgets()

<?php$file = fopen("example.txt", "r") or die("Unable to open file!");while (!feof($file)) {    echo fgets($file) . "<br>";}fclose($file);?>

? Use Case:

Ideal for reading logs or large files line by line to save memory.

? 3. Quick Read – file_get_contents()

<?php$content = file_get_contents("example.txt");echo $content;?>

? Simple and fast:

• Reads entire file content into a string

• No need to use fopen() or fclose()

? 4. Read File into Array – file()

<?php$lines = file("example.txt");foreach ($lines as $line) {    echo $line . "<br>";}?>

? Use Case:

Returns each line of the file as an array element – good for line processing.

? Extra Tip: Check if File Exists

<?phpif (file_exists("example.txt")) {    echo "The file exists.";} else {    echo "File not found.";}?>

? Security Note:

Always validate file names/paths and sanitize content before displaying or processing. Avoid reading user-uploaded files blindly.

Want an example where you read a text file submitted by a user or something like a simple log viewer?