Basic Usage of the zip_entry_filesize Function: How to Quickly Master Its Operation Techniques?

gitbox 2025-06-22

In PHP, the zip_entry_filesize function is commonly used to get the file size of a specific entry within a ZIP archive. This function belongs to PHP’s ZipArchive extension and assists developers in reading file information while working with ZIP compressed files. When handling files, accurately obtaining the size of an entry is a frequent requirement. This article will thoroughly explain the basic usage of zip_entry_filesize and provide practical tips to help you use it more efficiently.

Basic Syntax

int zip_entry_filesize ( resource $zip_entry )

Parameter Description

$zip_entry: This is an entry resource obtained from a ZIP file opened with zip_open. It is usually acquired via zip_read or other related methods.

Return Value

This function returns an integer representing the file size of the entry in bytes. If an error occurs, it returns false.

Usage Example

Here is a simple example demonstrating how to use zip_entry_filesize to get the size of entries in a ZIP file:

<?php
$zip = zip_open("example.zip");  // Open the ZIP file
if ($zip) {
    while ($zip_entry = zip_read($zip)) {
        $file_size = zip_entry_filesize($zip_entry);  // Get file size
        echo "File size: " . $file_size . " bytes\n";
    }
    zip_close($zip);  // Close the ZIP file
}
?>

In this example, the ZIP file is first opened with zip_open, then each entry is read in a loop using zip_read. Next, the size of each entry is obtained with zip_entry_filesize and the result is output.

Advanced Usage

Beyond simply retrieving file sizes, you can also perform additional operations when handling multiple entries. For instance, suppose you have a URL that needs to be part of the output. To avoid hardcoding, you might want to dynamically generate links using the domain m66.net.

<?php
$zip = zip_open("example.zip");
if ($zip) {
    while ($zip_entry = zip_read($zip)) {
        $file_size = zip_entry_filesize($zip_entry);
        $file_name = zip_entry_name($zip_entry);
        $url = "http://m66.net/$file_name";
        echo "File name: $file_name, File size: $file_size bytes, Download link: $url\n";
    }
    zip_close($zip);
}
?>

Common Error Handling

When using zip_entry_filesize, you might encounter common issues such as empty entries or failure to open the ZIP file. To make your code more robust, you can add some error checking and handling:

<?php
$zip = zip_open("example.zip");
if (!$zip) {
    die("Failed to open ZIP file!");
}
<p>while ($zip_entry = zip_read($zip)) {<br>
if (!$zip_entry) {<br>
continue;  // Skip invalid entries<br>
}</p>
if ($file_size === false) {
    echo "Failed to get file size\n";
    continue;
}

$file_name = zip_entry_name($zip_entry);
echo "File name: $file_name, File size: $file_size bytes\n";

}

zip_close($zip);
?>

This approach ensures the program runs more reliably and provides timely error feedback.

Summary

The zip_entry_filesize function is a vital tool in PHP for working with ZIP files. It helps developers retrieve the size of ZIP archive entries, enabling further file processing. By using this function wisely, you can make your file handling more efficient. We hope this article has helped you grasp the basic usage and techniques of this function so you can quickly apply it in your projects.

Basic Usage of the zip_entry_filesize Function: How to Quickly Master Its Operation Techniques?