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

Adds unique members to a Redis set.

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

What It Does

Adds unique members to a Redis set.

Syntax and Return Value

Redis::sAdd(...)

The return value and exceptional cases depend on the call described here: Repeated members are ignored; sets have no guaranteed iteration order.

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);
echo $redis->sAdd('guide:sadd:1',"php",'draft',"php");

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);
echo $redis->sAdd('guide:sadd:2',"php",'review',"php");

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);
echo $redis->sAdd('guide:sadd:3',"php",'published',"php");

Important Behavior and Edge Cases

Repeated members are ignored; sets have no guaranteed iteration order.

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

• Adds unique members to a Redis set.
• Repeated members are ignored; sets have no guaranteed iteration order.
• zAdd assigns sortable scores to sorted-set 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.