PHP Redis::hGetAll() Method: Usage and Examples

Retrieves all fields and values from one Redis hash.

The objective is to understand the behavior and operational limits, not only the method name.

What It Does

Retrieves all fields and values from one Redis hash.

Syntax and Return Value

Redis::hGetAll(...)

The return value and exceptional cases depend on the call described here: A large hash allocates a potentially large PHP array; use hScan for incremental access.

Requirements: install and enable the corresponding PHP driver or extension and configure the service before running the examples.

Example 1: Basic Use

Requires the phpredis extension and a running Redis server. Keys use a guide-specific prefix; clean up example keys after experimenting.

<?php
$redis = new Redis();
$redis->connect(getenv('REDIS_HOST') ?: '127.0.0.1', (int) (getenv('REDIS_PORT') ?: 6379), 2.0);
$redis->hMSet('guide:hgetall:1',["name"=>'draft',"visits"=>3]);
echo json_encode($redis->hGetAll('guide:hgetall:1'));

Example 2: A Second Scenario

Requires the phpredis extension and a running Redis server. Keys use a guide-specific prefix; clean up example keys after experimenting.

<?php
$redis = new Redis();
$redis->connect(getenv('REDIS_HOST') ?: '127.0.0.1', (int) (getenv('REDIS_PORT') ?: 6379), 2.0);
$redis->hMSet('guide:hgetall:2',["name"=>'review',"visits"=>4]);
echo json_encode($redis->hGetAll('guide:hgetall:2'));

Example 3: Practical Checks

Requires the phpredis extension and a running Redis server. Keys use a guide-specific prefix; clean up example keys after experimenting.

<?php
$redis = new Redis();
$redis->connect(getenv('REDIS_HOST') ?: '127.0.0.1', (int) (getenv('REDIS_PORT') ?: 6379), 2.0);
$redis->hMSet('guide:hgetall:3',["name"=>'published',"visits"=>5]);
echo json_encode($redis->hGetAll('guide:hgetall:3'));

Important Behavior and Edge Cases

A large hash allocates a potentially large PHP array; use hScan for incremental access.

For production use, also account for error handling, data validation, resource limits and environment-specific driver behavior.

Comparison with Related Approaches

Common Beginner Mistakes

Key Takeaways

• Retrieves all fields and values from one Redis hash.
• A large hash allocates a potentially large PHP array; use hScan for incremental access.
• hMGet reads only named fields.

Choose this API or pattern when its exact semantics match your task, and verify the result against the database driver and runtime used by your application.