Redis 学习笔记5 常用php函数
Redis 学习笔记五 常用php函数
PHPRedis的安装在这里：
http://blog.csdn.net/xundh/article/details/46288277
键值操作
<code class=" hljs lasso"><span class="hljs-variable">$redis</span> <span class="hljs-subst">=</span> <span class="hljs-literal">new</span> Redis();<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>connect(<span class="hljs-string">'127.0.0.1'</span>, <span class="hljs-number">6379</span>);<span class="hljs-comment">//参数：connect(host,port,timeout)</span><span class="hljs-comment">//timeout可以为空，在redis.conf里timeout默认300</span><span class="hljs-comment">//pconnect不会主动关闭的连接</span></code>
key
<code class=" hljs lasso"><span class="hljs-comment">//写入值</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span><span class="hljs-built_in">set</span>(<span class="hljs-variable">$work</span><span class="hljs-subst">-></span>uid, <span class="hljs-variable">$workString</span>);<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>setnx(<span class="hljs-variable">$work</span><span class="hljs-subst">-></span>uid,<span class="hljs-variable">$workString</span>); <span class="hljs-comment">//key不存在是赋值</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>setex(<span class="hljs-variable">$a</span>,<span class="hljs-number">50</span>,<span class="hljs-number">1</span>); <span class="hljs-comment">//range设置值后ttl设为50</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>setrange(key,offset,value);<span class="hljs-comment">//获取值</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>get(<span class="hljs-variable">$work</span><span class="hljs-subst">-></span>uid);<span class="hljs-comment">//删除key</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>del(<span class="hljs-variable">$work</span><span class="hljs-subst">-></span>uid);var_dump(<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>get(<span class="hljs-variable">$work</span><span class="hljs-subst">-></span>uid)); <span class="hljs-comment">//返回bool(false)</span><span class="hljs-comment">//键是否存在</span><span class="hljs-keyword">if</span>(<span class="hljs-subst">!</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>exists(<span class="hljs-string">'key'</span>)) var_dump(<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>del(<span class="hljs-string">'key'</span>)); <span class="hljs-comment">//返回int(0)</span></code>
mset多个key操作
<code class=" hljs php"><span class="hljs-comment">//设置mset</span><span class="hljs-variable">$array_mset</span>=[<span class="hljs-string">'a'</span>=><span class="hljs-number">1</span>,<span class="hljs-string">'b'</span>=><span class="hljs-number">2</span>];<span class="hljs-variable">$redis</span>->mset(<span class="hljs-variable">$array</span>);<span class="hljs-variable">$redis</span>->msetnx(<span class="hljs-variable">$array</span>); <span class="hljs-comment">//key不存在时才写入，但一次要么全写，要么全不写。</span><span class="hljs-comment">//读取mset</span><span class="hljs-variable">$array_mget</span>=[<span class="hljs-string">'a'</span>,<span class="hljs-string">'b'</span>];<span class="hljs-variable">$redis</span>->mget(<span class="hljs-variable">$arram_mget</span>);<span class="hljs-comment">//删除多个key</span><span class="hljs-variable">$redis</span>->del(<span class="hljs-variable">$array_mget</span>);</code>
keys
<code class=" hljs php"><span class="hljs-comment">//读取keys</span><span class="hljs-variable">$array_mset_keys</span>=[<span class="hljs-string">'abc'</span>=><span class="hljs-number">1</span>,<span class="hljs-string">'bcd'</span>=><span class="hljs-number">2</span>,<span class="hljs-string">'cde'</span>=><span class="hljs-number">3</span>];<span class="hljs-variable">$redis</span>->keys(<span class="hljs-string">'*a*'</span>); <span class="hljs-comment">//返回['a'=>1];</span><span class="hljs-variable">$redis</span>->keys(<span class="hljs-string">'b??'</span>); <span class="hljs-comment">//返回['b'=>2];</span><span class="hljs-variable">$redis</span>->keys(<span class="hljs-string">'*'</span>); <span class="hljs-comment">//返回所有keys</span></code>
getset key value
设置值并返回旧值
strlen
返回字符串长度
getrange(substr)
字符串截取
rename
键改名
<code class=" hljs ruby"><span class="hljs-variable">$redis</span>->rename(<span class="hljs-string">'a'</span>,<span class="hljs-string">'a1'</span>); <span class="hljs-regexp">//</span>成功返回<span class="hljs-keyword">true</span>，键不存在时返回<span class="hljs-keyword">false</span>，newkey已经存在其值会被覆盖；</code>
renamex
键改名，newkey存在时不改
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>renamex(<span class="hljs-string">'a'</span>,<span class="hljs-string">'a1'</span>); <span class="hljs-comment">//a1如果已经存在，返回0；</span></code>
append
字符串追加
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>append(<span class="hljs-string">'a'</span>,<span class="hljs-string">'12345'</span>) ;<span class="hljs-comment">//如果a不存在，就是普通的set操作</span></code>
incr
储存的数字值增1
incrby
值增increment
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>incrby(<span class="hljs-string">'a'</span>,<span class="hljs-number">10</span>);</code>
decr
数字值减1
decrby
数字值减decrement
setbit key offset value
设置或清除指定位
getbit key offset
获取指定偏移量上的位
type
返回key值类型
返回值有以下几种：
| none | (key不存在) | int(0) |
|---|---|---|
| string | 字符串 | int(1) |
| list | 列表 | int(3) |
| set | 集合 | int(2) |
| zset | 有序集合 | int(4) |
| hash | 哈希表 | int(5) |
randomkey
随机返回一个key
<code class=" hljs bash"><span class="hljs-built_in">echo</span> <span class="hljs-variable">$redis</span>->randomkey(); //如果没有key 返回<span class="hljs-literal">false</span></code>
object
查看对象
move
移动数据
<code class=" hljs ruby"><span class="hljs-variable">$redis</span>-><span class="hljs-constant">MOVE</span>(<span class="hljs-string">'a'</span>,<span class="hljs-number">1</span>)); <span class="hljs-regexp">//</span>把键a从当前数据库移到<span class="hljs-number">1</span>里。如果key不存在，返回<span class="hljs-keyword">false</span>; 目标数据库存在key时，返回<span class="hljs-keyword">false</span>.</code>
Hash
hset key field value
设置哈希值
hsetnx key field value
不存在时设置值
hmset key field value[field value…]
设置多个哈希值
hget key field
获取hash域值
hmget key field [field …]
获取若干个域值
hgetall key
返回key所有域和值
hdel key field [field…]
删除一个或多个域
hlen key
返回key里域数量
hexists key field
查看key里给定域的field是否存在
hincrby key field increment
域值增加increment
hkeys key
返回所有域
hvals key
返回key所有值
表
lpush key value[value…] 表头插入一个或多个值
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>lpush(<span class="hljs-string">'a'</span>,<span class="hljs-number">1</span>);<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>lpush(<span class="hljs-string">'a'</span>,<span class="hljs-number">2</span>);</code>
lpushx key value
当且仅当key存在并且是一个列表时才插入
rpush key value
表尾插入
rpushx key value
lpop key
移除并返回key头元素
rpop key
移除并返回key的尾元素
blpop key [key…]
timeout lpop的阻塞版本，如果没有可供弹出的元素，程序会等待。
brpop key [key…]
timeout rpop的阻塞版本
llen key
返回列表 key的长度
lrange key start stop
返回区间
lrem key count value
移除列表值为value的元素
count>0 从表头向表尾搜索，移除值为value的元素，数量为count
count<0 从表尾向表头，移除值为value的元素，数量为-count
count=0 移除值为value的元素
lset key index value
设置key下标为index的值
ltrim key start stop
对列表修剪，删除区间外元素
lindex key index
返回下标为index的元素
linsert key
插入
rpoplpush source destination
弹出最后一个元素，把元素插入到列表destination里作为表头
brpoplpush source destination timeout
阻塞
集合(Set)
sadd key member [member …]
插入元素到集合里
srem key member [member …]
移除元素
smembers key
返回集合成员
sismember key member
判断member是否是key的成员
scard key
返回集合key的基数
smove source destination member
member元素从source移动到destination
spop key
移除并返回集合中的一个随机元素
srandmember
返回集合中一个随机元素
sinter key [key…]
返回集合成员
sinterstore destination key[key…]
返回成员到destination里，如果目标存在则覆盖
sunion key [key …]
返回集合全部成员
sunionstore destination key[key…]
返回成员保存到destination
sdiff key[key…]
返回一个集合的全部成员
sdiffstore destination key[key…]
结果保存到destination
Sorted Set有序集
zadd key score member[[score member] [score member] …]
一个或多个member及其score加入到有序集key中
zrem key member [member…]
移除有序集key中的一个或多个成员
zcard key
返回有序集key的基数
zcount key min max
返回有序集key中，score值在min与max之间的成员
zscore key member
返回有序集key中成员member的score值
zincreby key increment member
给member成员的score值增量
zrange key start stop [WITHSCORES]
返回有序集key中指定区间成员，score从小到大
zrevrange key start stop [WITHSCORES]
返回key中指定区间内的成员，score从大到小
zrangebyscore
返回区间成员，score从小到大
zrevrangebyscore key max min [WITHSCORES] [LIMIT offset count]
返回敬意成员，score从大到小
zrank key member
返回member排名，score从小到大
zrevrank key member
member排名，score递减
ZREMRANGEBYRANK key start stop
移除成员，下标在start stop之间
ZREMRANGEBYSCORE key min max
移除成员，score在min与max之间
ZINTERSTORE destination numkeys key [key …] [WEIGHTS weight [weight …]] [AGGREGATE SUM|MIN|MAX]
计算有序集交集
ZUNIONSTORE
计算有序集并集
排序
sort 数值排序
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>SORT(<span class="hljs-string">'a'</span>); <span class="hljs-comment">//返回排序结果</span></code>
alpha限定按字符排序
<code class=" hljs php"><span class="hljs-variable">$redis</span>->SORT(<span class="hljs-string">'a'</span>,<span class="hljs-keyword">array</span>(<span class="hljs-string">'ALPHA'</span>=><span class="hljs-keyword">TRUE</span>)); <span class="hljs-comment">//返回排序结果</span></code>
limit限定返回数量
<code class=" hljs php"><span class="hljs-variable">$redis</span>->SORT(<span class="hljs-string">'a'</span>,<span class="hljs-keyword">array</span>(<span class="hljs-string">'LIMIT'</span>=><span class="hljs-keyword">array</span>(<span class="hljs-number">0</span>,<span class="hljs-number">5</span>));</code>
SORT限定正序倒序
<code class=" hljs php"><span class="hljs-variable">$redis</span>->SORT(<span class="hljs-string">'a'</span>,<span class="hljs-keyword">array</span>(<span class="hljs-string">'SORT'</span>=><span class="hljs-string">'DESC'</span>));</code>
by外部排序
<code class=" hljs php"><span class="hljs-variable">$redis</span>->SORT(<span class="hljs-string">'a'</span>,<span class="hljs-keyword">array</span>(<span class="hljs-string">'BY'</span>=><span class="hljs-string">''</span>));</code>
排序其它用法较多，这里不再详细一一列举。
生命周期
ttl、expire、expireat
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span><span class="hljs-built_in">set</span>(<span class="hljs-string">'a'</span>,<span class="hljs-number">12345</span>);<span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>expire(<span class="hljs-string">'a'</span>,<span class="hljs-number">30</span>); <span class="hljs-comment">//单位秒</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>expireat(<span class="hljs-string">'a'</span>,<span class="hljs-string">'1435152916'</span>); <span class="hljs-comment">//接受时间戳</span>echo <span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>get(<span class="hljs-string">'a'</span>); <span class="hljs-comment">//如果已经过期，返回false</span>echo <span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>ttl(<span class="hljs-string">'a'</span>); <span class="hljs-comment">//返回剩余时间（秒）。如果未赋expire值，返回-1；如果键不存在，也返回-1</span></code>
persit移除生存时间
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>persist(<span class="hljs-string">'a'</span>);</code>
数据库操作
选择数据库
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span><span class="hljs-keyword">SELECT</span>(<span class="hljs-number">0</span>); <span class="hljs-comment">//默认就是数据库0 </span></code>
清除
<code class=" hljs lasso"><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>FLUSHALL(); <span class="hljs-comment">//删除所有数据库</span><span class="hljs-variable">$redis</span><span class="hljs-subst">-></span>flushdb(); <span class="hljs-comment">//删除当前数据库所有key</span></code>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to build the redis cluster mode
Apr 10, 2025 pm 10:15 PM
Redis cluster mode deploys Redis instances to multiple servers through sharding, improving scalability and availability. The construction steps are as follows: Create odd Redis instances with different ports; Create 3 sentinel instances, monitor Redis instances and failover; configure sentinel configuration files, add monitoring Redis instance information and failover settings; configure Redis instance configuration files, enable cluster mode and specify the cluster information file path; create nodes.conf file, containing information of each Redis instance; start the cluster, execute the create command to create a cluster and specify the number of replicas; log in to the cluster to execute the CLUSTER INFO command to verify the cluster status; make
How to clear redis data
Apr 10, 2025 pm 10:06 PM
How to clear Redis data: Use the FLUSHALL command to clear all key values. Use the FLUSHDB command to clear the key value of the currently selected database. Use SELECT to switch databases, and then use FLUSHDB to clear multiple databases. Use the DEL command to delete a specific key. Use the redis-cli tool to clear the data.
How to read redis queue
Apr 10, 2025 pm 10:12 PM
To read a queue from Redis, you need to get the queue name, read the elements using the LPOP command, and process the empty queue. The specific steps are as follows: Get the queue name: name it with the prefix of "queue:" such as "queue:my-queue". Use the LPOP command: Eject the element from the head of the queue and return its value, such as LPOP queue:my-queue. Processing empty queues: If the queue is empty, LPOP returns nil, and you can check whether the queue exists before reading the element.
How to use redis lock
Apr 10, 2025 pm 08:39 PM
Using Redis to lock operations requires obtaining the lock through the SETNX command, and then using the EXPIRE command to set the expiration time. The specific steps are: (1) Use the SETNX command to try to set a key-value pair; (2) Use the EXPIRE command to set the expiration time for the lock; (3) Use the DEL command to delete the lock when the lock is no longer needed.
How to use the redis command
Apr 10, 2025 pm 08:45 PM
Using the Redis directive requires the following steps: Open the Redis client. Enter the command (verb key value). Provides the required parameters (varies from instruction to instruction). Press Enter to execute the command. Redis returns a response indicating the result of the operation (usually OK or -ERR).
How to read the source code of redis
Apr 10, 2025 pm 08:27 PM
The best way to understand Redis source code is to go step by step: get familiar with the basics of Redis. Select a specific module or function as the starting point. Start with the entry point of the module or function and view the code line by line. View the code through the function call chain. Be familiar with the underlying data structures used by Redis. Identify the algorithm used by Redis.
How to use the redis command line
Apr 10, 2025 pm 10:18 PM
Use the Redis command line tool (redis-cli) to manage and operate Redis through the following steps: Connect to the server, specify the address and port. Send commands to the server using the command name and parameters. Use the HELP command to view help information for a specific command. Use the QUIT command to exit the command line tool.
How to configure Lua script execution time in centos redis
Apr 14, 2025 pm 02:12 PM
On CentOS systems, you can limit the execution time of Lua scripts by modifying Redis configuration files or using Redis commands to prevent malicious scripts from consuming too much resources. Method 1: Modify the Redis configuration file and locate the Redis configuration file: The Redis configuration file is usually located in /etc/redis/redis.conf. Edit configuration file: Open the configuration file using a text editor (such as vi or nano): sudovi/etc/redis/redis.conf Set the Lua script execution time limit: Add or modify the following lines in the configuration file to set the maximum execution time of the Lua script (unit: milliseconds)
