PHP inflate_init() Function: Usage and Examples

Use inflate_init() when you need to creates a stateful context for streaming decompression in a PHP application. The examples below show the actual operation and its limitations.

What Is inflate_init() in PHP?

Creates a stateful context for streaming decompression. The exact signature supported by your installation depends on its PHP version and enabled extensions.

Its syntax is:

inflate_init(int $encoding, object|array $options = ...): InflateContext|false

Parameters and return value: The parameter types, optional arguments, references, and return type are shown in the signature above. Optional parameters are marked with an ellipsis in this reference signature.

Example 1: Basic Usage

<?php

$context = inflate_init(ZLIB_ENCODING_RAW); var_dump($context instanceof InflateContext);

Output:

bool(true)

Example 2: Different Input or Behavior

<?php

$context = inflate_init(ZLIB_ENCODING_GZIP); echo get_debug_type($context);

Output:

InflateContext

Practical Example: Applying the Function

<?php

$packed = gzdeflate("sample"); $context = inflate_init(ZLIB_ENCODING_RAW); echo inflate_add($context,$packed,ZLIB_FINISH);

Output:

sample

Important Behavior and Edge Cases

Choose the correct encoding and do not mix compressed formats.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Creates a stateful context for streaming decompression.
• Choose the correct encoding and do not mix compressed formats.
• inflate_add() feeds compressed bytes into a context created by inflate_init().

Use inflate_init() for the specific operation demonstrated above. Check its prerequisites and handle failure conditions before using it with production data.