Why Does My PHP `while (!feof())` Loop Produce Incomplete File Output?

PHP while loop (!feof()) Incomplete Output Issue

Problem:

When attempting to read and display the contents of a text file using a PHP while loop (!feof()), not all the data is being outputted. The last string in the file is cut off.

Answer:

The root cause of this issue lies in the placement of the EOF check. The original code checked for the end of the file before outputting the last line. This resulted in the last line being partially truncated.

To address this, the EOF check should be integrated within the read process. Here's the corrected code:

<?php
$line_count = 0;

$handle = fopen("item_sets.txt", "r");

if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {
        $trimmed = trim($buffer);
        echo $trimmed;
        $line_count++;
    }
} else {
    echo 'Unexpected error opening file';
}
fclose($handle);

echo PHP_EOL.PHP_EOL.PHP_EOL.'Lines read from file = ' . $line_count;
?>

Additional Considerations:

• Removed the @ symbol before fopen, as it suppresses error messages and is considered bad practice.
• Added error handling for unexpected file opening errors.
• Added an end-of-line character (EOL) to separate the output.

Using this corrected code, the entire contents of the text file will be successfully read and displayed, including the last line.

The above is the detailed content of Why Does My PHP `while (!feof())` Loop Produce Incomplete File Output?. For more information, please follow other related articles on the PHP Chinese website!