仅使用数组中的最后一项？

Question

我有下面的数组（特定于tx数组），只想要数组中的最后一个（在本例中为32）。

如何做到这一点？另外，是否可以在数组中添加#s？

例如：1 + 2 + 3 ... + 31 + 32？

感谢任何提供帮助的人。

Array
(
    [hash] => f52ba5e38ad3a86f54d901fafdb149cbcc190da45783fcdf3099ca272c452289
    [confirmations] => 1
    [size] => 10111
    [height] => 457209
    [version] => 2
    [merkleroot] => 760639a16ade9568c84c3b6ef830b88bc744cb0dc7a35875553852d478f0a4df
    [tx] => Array
        (
            [0] => 4340529c70443dbc9c476b65201307a232ea9aca80d9bcb231d5d302acc2997a
            [1] => cde0d2a5311a981e82dbd8b856a64659f953fbb050246f21beb90cc6595f1ff4
            [2] => 8c01dc9ac687a8ca6e51faf1f882c1ec523046d74a9587500751508b5a6be83d
            [3] => d9777b6ace68484dc723a7e892da6ead5b32d4f1d9ef236a27f76d77500de144
            [4] => 9c4895e4921600d1fbf998115b352254cea94efa9791d3c32be139a6bc2d733a
            [5] => f47314ae4cd118c2b824562f29874209f9cfbd47735bf10f92adfe6cd6a273f8
            [6] => 53b6c6efcdfb0ed13a39d6602f9a1e1e577fbfb30067b839aa779492b8ec16bc
            [7] => f52877a1929ba516261b0cb21603fa30e815ad0b1122f9ec07ce25d9a1c84b0a
            [8] => 615851304a629f490e8fca80be73e6e4eb42e31080fb0827b7387ea97a7d57a8
            [9] => 1df62c690f898cb2328f9a6de25b74f62c8c03ef401ff5e45a7837360302873a
            [10] => e0c787691988d4424e5ae5f9a185a9fbd810b27fd32428041f69f2012155ebe5
            [11] => b20568aeaaffa1beec8b1bc0d4acbbf36a06f1d01093af98e539fcf7a42a67cc
            [12] => 84504f0f3cb0b01b33388639a29b113e8bee467823062f916910d0f6675a2ff3
            [13] => 8af937c341c652a6c9d4cd7e99cf5bb0ac80d0259f02831dc761f5c6f04c0176
            [14] => 3e4e1195900cd9dc238b31784cb366cfb3a9c24e52dfda4eadbc0483f73a5430
            [15] => 1301c674da30547039da4a5cb252576d421d4546acadbcbe08e4cbe72ef9fb41
            [16] => b0564d650cc2c041204122396ffd3fc69b6ea4d7338a9a68f3bf7d8ca8dab319
            [17] => 7861d486982df4ecfd72916663fde4facabfbfbe8606e2f92924233090d5fe51
            [18] => 6e447ebcd20e4dc0e939a33612dc08f5f17bbccdfaa8eaddb52e81e2a7a19af8
            [19] => 7a473f7c7829b3fc0423ed1f3be2dd5f3bc875adce440badd9191206a3135c4e
            [20] => d15c965a52c038b5df3295719072a7ff1820f62f569ca7b393f9537ea98c34af
            [21] => a954bb3ee5923592f150640e4b0aa9c8e75f218412c0856ede4df8885156c41f
            [22] => d6e90a235a5293a7d1655ca2a26871b8e1ff19ffa3d48bd8ebac785b55faa996
            [23] => 5f2c7854b13aa129d147fa095f8b5df4b68000322d37531703a40c1fbd42e467
            [24] => 00299a2efa03dee409650d267f873167afd84b52978d34d256cd3d91efdbecc7
            [25] => 1e136bf8ed16cbeca589e265d86db4ca2abc17207ebe871ef63042c8054a912e
            [26] => 8419ed271faa0fd56d8d37fdd4ba97b2b694a5faaaf6027a5f054f1954bad5ec
            [27] => d7c0246d271a877453f88e0ff5146110d9dc6e650e647d969e9cca7cfe330e7e
            [28] => 591ea2baa8441a0fff5cd86e19730c828fcb259c22379c10e5841e17308f41ec
            [29] => 7a6f9baa6d5a312ec0aeca576948787ec2cf214f6587e970a05f9d410144179f
            [30] => 1c45cde908c7cb6479cab71709f7022540386b5b32765b149cae892d8dc0430f
            [31] => 612e16a6d56aba216c582b71f4942b9f8c5aa3b58fc9f9ce06c8a59006b52bb8
            [32] => 451826b51c3f95a968bde0e79ba526e251c22953dd84b8248cc83c679e360182
        )

    [time] => 1384044294
    [nonce] => 224330496
    [bits] => 1b3ade18
    [difficulty] => 1113.26182029
    [previousblockhash] => 3fec0492c75946e4bcf8b5ddd4cb2ca667c5b892df5bf0df1f68de2d9c7ff366
)

Answer 1

使用PHP函数结束进行测试

  

end（）使数组的内部指针前进到最后一个元素，并且   返回它的值。

$fruits = array('apple', 'banana', 'cranberry');
echo end($fruits); // cranberry

<强> UPADATE

$data = array('hash' => 'f52ba5e38ad3a86f54d901fafdb149cbcc190da45783fcdf3099ca272c452289',
'confirmations' => 1,
'size' => 10111,
'height' => '457209',
'version' => 2,
'merkleroot' => '760639a16ade9568c84c3b6ef830b88bc744cb0dc7a35875553852d478f0a4df',
'tx' => array ('4340529c70443dbc9c476b65201307a232ea9aca80d9bcb231d5d302acc2997a','cde0d2a5311a981e82dbd8b856a64659f953fbb050246f21beb90cc6595f1ff4', '8c01dc9ac687a8ca6e51faf1f882c1ec523046d74a9587500751508b5a6be83d')
);

echo key（array_slice（$ data ['tx']，-1,1，TRUE））;

Answer 2

$ array ['tx']使用结束

假设您拥有的数组是$ array。

$tx_array = $array['tx']

最后一项是

$last = end($tx_array);

最后一把钥匙

$lastkey = end(array_keys($tx_array));

Answer 3

end($array['tx']);
print key($array['tx']); # 32

更好：

print end(array_keys($array['tx'])); # 32

如果索引是连续的：

print count($array['tx']) - 1; # 32

设置$array['#s']：

$array['#s'] = array_sum(array_keys($array['tx']));