Using PHP feof() to Detect End‑of‑File: Syntax, Parameters, Return Values, and Example

PHP is a widely used scripting language for web development, offering a rich set of functions for handling files; among them, feof() is used to determine whether a file pointer has reached the end of a file.

The function signature is: bool feof ( resource $handle ) Parameter: $handle – the file pointer resource returned by fopen().

Return value: true if the pointer is at EOF, otherwise false.

Below is a practical example. Assume a file example.txt containing:

Hello World!
This is an example file.

The following PHP script opens the file, reads it line by line, checks for EOF with feof(), and finally closes the handle:

$handle = fopen("example.txt", "r");
if ($handle) {
    // Read each line
    while (($line = fgets($handle)) !== false) {
        echo $line;
    }
    // Check if pointer reached EOF
    if (feof($handle)) {
        echo "文件指针已到达文件末尾。";
    } else {
        echo "文件指针未到达文件末尾。";
    }
    fclose($handle);
}

When executed, the script outputs the file contents followed by the message indicating that the file pointer has reached the end of the file.

In summary, feof() is a built‑in PHP file‑handling function that helps developers detect the end of a file, preventing unnecessary reads; it should be used after opening a file with fopen() and the file handle should be closed with fclose() to release resources.