gzfile() Function is one of the PHP operations used in filesystem and stream workflows. Loads a gzip-compressed file into an array of lines. The examples below show what it does and how to handle its result.
What Is gzfile() Function?
Loads a gzip-compressed file into an array of lines.
Its syntax is:
gzfile(string $filename, int $use_include_path = 0)
The parameters are:
string $filename— The source or destination filesystem path.int $use_include_path = 0— When enabled, also searches the configured include_path locations for the requested file.
Return value: The declared return type is array|false. The compressed contents expand in memory; use gzopen()/gzgets() for large streams.
Important: The compressed contents expand in memory; use gzopen()/gzgets() for large streams.
Example 1: Basic Usage
The basic example focuses on the behavior of gzfile() Function: loads a gzip-compressed file into an array of lines. Inputs are defined locally or shown as application-controlled paths.
<?php
$lines = gzfile(__DIR__ . "/sample.log.gz");
if ($lines !== false) { echo count($lines); }
The displayed value, file content or return status depends on the input and surrounding environment. Results involving local paths, identifiers or generated files are not fixed values.
Example 2: A Different Use Case
This second example illustrates another input or execution condition for gzfile() Function. Notice the different checks, arguments, or output handling.
<?php
$logLines = gzfile(__DIR__ . "/logs.gz", FILE_IGNORE_NEW_LINES);
if ($logLines !== false) { foreach (array_slice($logLines, 0, 3) as $logLine) { echo $logLine . "\n"; } }
This variation matters because the compressed contents expand in memory; use gzopen()/gzgets() for large streams.
Practical Example: Using the Operation in an Application
The following example demonstrates how gzfile() Function fits into a more complete file or archive workflow, including inputs and appropriate checks.
<?php
$compressedLines = gzfile(__DIR__ . "/daily.log.gz", FILE_IGNORE_NEW_LINES);
if ($compressedLines !== false) { foreach (array_slice($compressedLines, -5) as $entry) { echo $entry . "\n"; } }
The operation shown is an illustrative script. Adapt the filenames, required permissions, and error handling to your own controlled application environment before running it.
Important Behavior and Edge Cases
- Function behavior: Loads a gzip-compressed file into an array of lines.
- Limitation: The compressed contents expand in memory; use gzopen()/gzgets() for large streams.
Comparison With Related Functions
| Function or Method | Difference |
|---|---|
gzfile() Function | Loads a gzip-compressed file into an array of lines. |
gzgets() | Streams lines from an opened gzip file; gzfile() loads the entire decompressed list into memory. |
Use gzfile() Function for the specific behavior described above. The related operation, gzgets(), serves a different purpose; do not substitute it unless that different behavior is intended.
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Treating stream or file operations as guaranteed complete on the first call. | The compressed contents expand in memory; use gzopen()/gzgets() for large streams. Handle false returns, partial I/O, stream position and closing resources. |
| Treating gzgets() as an interchangeable replacement for gzfile() Function. | Streams lines from an opened gzip file; gzfile() loads the entire decompressed list into memory. |
Key Takeaways
- Loads a gzip-compressed file into an array of lines.
- The compressed contents expand in memory; use gzopen()/gzgets() for large streams.
- Related operation: gzgets() — Streams lines from an opened gzip file; gzfile() loads the entire decompressed list into memory.
gzfile() Function is useful when its specific behavior matches your application requirement. Keep paths controlled, check failures, and handle environment-dependent operations deliberately.