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PHP obtains all attributes in a class based on reflection
- 墨辰丷Original
- 2018-05-18 10:22:013094browse
This article mainly introduces PHP to obtain all the methods in a class based on reflection. Combined with the example form, it analyzes in detail the steps and related precautions for PHP to obtain all properties and methods in the class using the reflection mechanism. Friends who need it You can refer to the following
The details are as follows:
When we use a class with neither source code nor documentation (especially classes provided by PHP extensions, such as mysqli, Redis classes), what should we do? Knowing what methods are provided in this class and how to use each method, it is time for the powerful reflection in PHP to appear. The following is a code demonstration using the Redis extension as an example:
<?php
$ref = new ReflectionClass('Redis');
$consts = $ref->getConstants(); //返回所有常量名和值
echo "----------------consts:---------------" . PHP_EOL;
foreach ($consts as $key => $val)
{
echo "$key : $val" . PHP_EOL;
}
$props = $ref->getDefaultProperties(); //返回类中所有属性
echo "--------------------props:--------------" . PHP_EOL . PHP_EOL;
foreach ($props as $key => $val)
{
echo "$key : $val" . PHP_EOL; // 属性名和属性值
}
$methods = $ref->getMethods(); //返回类中所有方法
echo "-----------------methods:---------------" . PHP_EOL . PHP_EOL;
foreach ($methods as $method)
{
echo $method->getName() . PHP_EOL;
}
Return result:
----------------consts:--------------- REDIS_NOT_FOUND : 0 REDIS_STRING : 1 REDIS_SET : 2 REDIS_LIST : 3 REDIS_ZSET : 4 REDIS_HASH : 5 ATOMIC : 0 MULTI : 1 PIPELINE : 2 OPT_SERIALIZER : 1 OPT_PREFIX : 2 OPT_READ_TIMEOUT : 3 SERIALIZER_NONE : 0 SERIALIZER_PHP : 1 OPT_SCAN : 4 SCAN_RETRY : 1 SCAN_NORETRY : 0 AFTER : after BEFORE : before --------------------props:-------------- -----------------methods:--------------- __construct __destruct connect pconnect close ping echo get set setex psetex setnx getSet randomKey renameKey renameNx getMultiple exists delete incr incrBy incrByFloat decr decrBy type append getRange setRange getBit setBit strlen getKeys sort sortAsc sortAscAlpha sortDesc sortDescAlpha lPush rPush lPushx rPushx lPop rPop blPop brPop lSize lRemove listTrim lGet lGetRange lSet lInsert sAdd sSize sRemove sMove sPop sRandMember sContains sMembers sInter sInterStore sUnion sUnionStore sDiff sDiffStore setTimeout save bgSave lastSave flushDB flushAll dbSize auth ttl pttl persist info resetStat select move bgrewriteaof slaveof object bitop bitcount bitpos mset msetnx rpoplpush brpoplpush zAdd zDelete zRange zReverseRange zRangeByScore zRevRangeByScore zRangeByLex zCount zDeleteRangeByScore zDeleteRangeByRank zCard zScore zRank zRevRank zInter zUnion zIncrBy expireAt pexpire pexpireAt hGet hSet hSetNx hDel hLen hKeys hVals hGetAll hExists hIncrBy hIncrByFloat hMset hMget multi discard exec pipeline watch unwatch publish subscribe psubscribe unsubscribe punsubscribe time eval evalsha script debug dump restore migrate getLastError clearLastError _prefix _serialize _unserialize client scan hscan zscan sscan pfadd pfcount pfmerge getOption setOption config slowlog rawCommand getHost getPort getDBNum getTimeout getReadTimeout getPersistentID getAuth isConnected getMode wait pubsub open popen lLen sGetMembers mget expire zunionstore zinterstore zRemove zRem zRemoveRangeByScore zRemRangeByScore zRemRangeByRank zSize substr rename del keys lrem ltrim lindex lrange scard srem sismember zrevrange sendEcho evaluate evaluateSha
Further, when we want to know how to use a specific method and what parameters it has, we can To further reflect this method, take the bitpos method in the above example as an example (the use of this method is not introduced in the document)
echo '---------------------params-----------------------' . PHP_EOL . PHP_EOL; $reflectMethod = $ref->getMethod('bitpos'); //传入方法名即可 echo $reflectMethod; // 会调用$reflectMethod->__toString() 返回可打印的形式;
Print results:
---------------------params-----------------------
Method [ <internal:redis> public method bitpos ] {
}
I didn’t see any required parameters. It may be related to the specific implementation of the method. The specific reason can only be seen in the code implementation of the redis extension. Under normal circumstances, it should be It returns the following form, taking the select_db method of mysqli as an example:
$ref = new ReflectionClass('mysqli'); echo '---------------------params-----------------------' . PHP_EOL . PHP_EOL; $reflectMethod = $ref->getMethod('select_db'); //传入方法名即可 echo $reflectMethod; // 会调用$reflectMethod->__toString() 返回可打印的形式;
---------------------params-----------------------
Method [ <internal:mysqli> public method select_db ] {
- Parameters [1] {
Parameter #0 [ <required> $database ]
}
}
There is no The solution is that we can only rely on our understanding of redis and refer to similar methods to use it, such as bitop
public function bitOp( $operation, $retKey, ...$keys) {}
Post the final method call
$redis = new Redis(); $redis->connect('127.0.0.1'); $redis->setBit('bit', 15, 1); echo 'bitpos: ' . $redis->bitpos('bit', 1) . PHP_EOL; //bitpos: 15 $redis->close();
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