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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 is part of PHP’s ZipArchive extension and helps developers retrieve file information when handling ZIP compressed files. Accurately obtaining the size of an entry is a very common requirement during file operations. This article will provide a detailed introduction to the basic usage of zip_entry_filesize, along with some practical operation tips to help you use it more efficiently.
int zip_entry_filesize ( resource $zip_entry )
$zip_entry: This is an entry resource obtained from a ZIP file opened by zip_open. It is usually acquired through zip_read or other methods.
This function returns an integer representing the file size of the entry in bytes. If an error occurs, the return value is false.
Here is a simple example showing how to use zip_entry_filesize to get the size of an entry inside 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 using zip_open, then each entry is read in a loop using zip_read. After that, zip_entry_filesize retrieves the file size of the current entry, and the result is output.
Beyond simply obtaining file sizes, additional operations can be performed when handling multiple entries. For instance, if you have a URL that needs to be part of the output, and to avoid hardcoding, assume you want to handle dynamic links using m66.net as the domain name in the output.
<?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);
}
?>
When using zip_entry_filesize, you might encounter common errors such as empty entries or failure to open the ZIP file. To improve code robustness, you can add some error checks and handling:
<?php
$zip = zip_open("example.zip");
if (!$zip) {
die("Unable 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 allows the program to run more stably and provide timely error feedback.
The zip_entry_filesize function is a vital tool in PHP’s ZIP file processing, helping developers obtain the file size of entries within ZIP archives for further handling. In practical projects, using this function appropriately can make your file processing more efficient. Through this article, you should now have a good grasp of the basic usage and techniques of this function and be able to quickly apply it to your projects.
