Question

我有一阵列,例如:

$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");

我想把6个随机元素作为扼杀(如1a3564):

$random_color = array_rand($hex,6);

我认为,如果 $花钱的话,就会有:

echo implode($random_color);

但是,阵列(rand)储存着母体阵列中元素的位置,而不是这些阵列元素,因此,我获得这样的东西:

259111213 instead of 259bcd.

I know this does exactly what I want:

echo $hex[$random_color[0]];
echo $hex[$random_color[1]];
echo $hex[$random_color[2]];
echo $hex[$random_color[3]];
echo $hex[$random_color[4]];
echo $hex[$random_color[5]];

但:

是否有办法储存阵列中的阵列元素? 为什么它首先储存一些单位而不是一些要素?
我想要取得什么成就的最佳途径是什么?
为什么阵列——大() NEVER公司选择一封信作为第一个要素,几乎从来不算是第二/第三(99%的制成色像11111a 12345c 123456)?

Answer 1

you are close try this:

$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
shuffle($hex);

echo sub_str(implode(  ,$hex),0,6);

Answer 2

Random colors should be generated in simplier way:

printf( %02x%02x%02x ,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

or

printf( %06x ,mt_rand(0,16777215));

如果你需要将彩色与变数相隔,则使用http://php.net/manual/en/Function.sprintf.php>sprintf<<<>a>。而不是。

Answer 3

由于这些物品各不相同,你可以将其变成钥匙,而不是价值,然后使用<代码>array_rand。



implode(  , array_rand(array_flip($hex), 6));


然而,实现你的总体目标可能有更好的办法。 例如,如果总体目标允许重复数字,那么简单地将数字从0到0xFFFFFFFF和:


dechex(mt_rand(0, 0xFFFFFF));




  为什么它首先储存一些单位而不是一些要素?


手册网页:


  这样做是为了使你能够从阵列中抽取随机钥匙和价值。


  为什么阵列——大() NEVER公司选择一封信作为第一个要素,几乎从来不算是第二/第三(99%的制成色像11111a 12345c 123456)?


rand <(php_rand/code><><>><>>>><<>>>>>><<>>>>>>><>>>>><>>>>>>><>>>>>>><>>>>>>><>>>>>>>>>><>>>>>>>>><>>>>>>>>><>>>>>>><>>>>>>>>>><>>>>>>>>>>>>>>><>>>>>>>>>>>>>>>>>><>>>>>>>> 根据您的系统,php_rand  is rand ,rel=">>>>>>>>>>>>>>>>>>>>>>>> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >

Answer 4

rel=“nofollow”>,见人工,Return Values。

为了按预期开展工作,使用http://php.net/manual/en/Function.array-flip.php” rel=“nofollow”>array_flip(,以检索钥匙:

$random_color = array_rand(array_flip($hex), 6);

As for the "strange" results where there are almost no letters first elements, IDEOne and my server seem to reproduce these findings. A local machine running in my office (still running Debian etch / PHP 5.2.9) seems to disagree and evenly distribute elements from $hex... Seems to be a PHP version thing?

Answer 5

如果你不需要维持<代码>$hex阵列的次序,你可将其替换为shuffle()。与此类似():

<?php
$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
shuffle($hex);
echo implode(array_slice($hex, 0, 6));

Answer 6

如果你只想随机扼杀数位数,你也可以做这样的事情。

substr(md5(time()),-6);

或

substr(md5(uniqid()),-6);

如果不与阵列的各位沟通,你就会取得类似成果。

Answer 7

is there any way to store array elements within array_rand()? Why it stores elements positions instead of elements in the first place?

rel=“nofollow”>array_rand documentation ,它交还了阵列钥匙,而不是价值。由于你的阵列并不是一个联系阵列,关键人物是人数。你们需要做(未测试):

$result = "";
$random_color = array_rand($hex, 6);
foreach ($random_color as $randomIndex) {
  $result = $result . $hex[$randomIndex];
}

www.un.org/Depts/DGACM/index_spanish.htm 不要使用阵列或阵列——兰德,因为部件不能重复这种做法。这并不是你试图做的事。

我想要取得什么成就的最佳途径是什么?

If you want to generate a random color, you can use:

$color =   ;
while(strlen($c) < 6) {
    $color .= sprintf("%02X", mt_rand(0, 255));
}

why does array_rand() NEVER choose a letter as the first element, and almost never as the second/third (99% of generated colors look like 11111a 12345c 123456)?

您可能需要 ,但这只是一个猜测(见Timur评论本回答)。

mt_srand((double)microtime()*1000000);

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