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

Returns all current members in a set.

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

What It Does

Returns all current members in a set.

Syntax and Return Value

Redis::sMembers(...)

The return value and exceptional cases depend on the call described here: Ordering is not guaranteed and fetching a huge set may consume memory.

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);
$redis->sAdd('guide:smembers:1',"php","redis",'draft');
echo json_encode($redis->sMembers('guide:smembers: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);
$redis->sAdd('guide:smembers:2',"php","redis",'review');
echo json_encode($redis->sMembers('guide:smembers: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);
$redis->sAdd('guide:smembers:3',"php","redis",'published');
echo json_encode($redis->sMembers('guide:smembers:3'));

Important Behavior and Edge Cases

Ordering is not guaranteed and fetching a huge set may consume memory.

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

• Returns all current members in a set.
• Ordering is not guaranteed and fetching a huge set may consume memory.
• sScan iterates members in batches; sAdd adds members.

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.