blocks|key|935842|text|获取一个从0到255的随机数，然后将其转换为十六进制：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|935843|function+random_color_part()+{
++++return+str_pad(+dechex(+mt_rand(+0,+255+)+),+2,+'0',+STR_PAD_LEFT);
}

function+random_color()+{
++++return+random_color_part()+.+random_color_part()+.+random_color_part();
}

echo+random_color();|code-block|syntax|javascript|935844|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Get a random number from 0 to 255, then convert it to hex:

<pre><code>function random_color_part() {
 return str_pad( dechex( mt_rand( 0, 255 ) ), 2, '0', STR_PAD_LEFT);
}

function random_color() {
 return random_color_part() . random_color_part() . random_color_part();
}

echo random_color();
</code></pre>

blocks|key|935936|text|RGB十六进制字符串只是一个从0x0到0xFFFFFF的数字，因此只需在该范围内生成一个数字并将其转换为十六进制即可：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|935937|function+rand_color()+{
++++return+'#'+.+str_pad(dechex(mt_rand(0,+0xFFFFFF)),+6,+'0',+STR_PAD_LEFT);
}|code-block|syntax|javascript|935938|或者：|935939|function+rand_color()+{
++++return+sprintf('#%2506X',+mt_rand(0,+0xFFFFFF));
}|935940|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

An RGB hex string is just a number from 0x0 through 0xFFFFFF, so simply generate a number in that range and convert it to hexadecimal:

<pre><code>function rand_color() {
 return '#' . str_pad(dechex(mt_rand(0, 0xFFFFFF)), 6, '0', STR_PAD_LEFT);
}
</code></pre>

or:

<pre><code>function rand_color() {
 return sprintf('#%06X', mt_rand(0, 0xFFFFFF));
}
</code></pre>

blocks|key|935983|text|您可以使用md5来实现此目的，非常简短|type|unstyled|depth|inlineStyleRanges|entityRanges|data|935984|$color+=+substr(md5(rand()),+0,+6);|code-block|syntax|javascript|935985|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can use md5 for that purpose,very short

<pre><code>$color = substr(md5(rand()), 0, 6);
</code></pre>

blocks|key|936164|text|$rand+=+str_pad(dechex(rand(0x000000,+0xFFFFFF)),+6,+0,+STR_PAD_LEFT);
echo('#'+.+$rand);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|936165|如果需要，可以将rand()改为mt_rand()，还可以将strtoupper()放在str_pad()周围，以使随机数看起来更好(尽管这不是必需的)。|unstyled|offset|length|style|CODE|936166|它工作得很完美，而且比这里描述的所有其他方法都简单得多:)|936167|entityMap^0|0|8|6|G|9|U|C|18|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@$G|Q|H|R|I|J]|$G|S|H|T|I|J]|$G|U|H|V|I|J]|$G|W|H|X|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$]]|$1|M|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>$rand = str_pad(dechex(rand(0x000000, 0xFFFFFF)), 6, 0, STR_PAD_LEFT);
echo('#' . $rand);
</code></pre>

You can change <code>rand()</code> in for <code>mt_rand()</code> if you want, and you can put <code>strtoupper()</code> around the <code>str_pad()</code> to make the random number look nicer (although it’s not required).

It works perfectly and is way simpler than all the other methods described here :)

blocks|key|936094|text|$color+=+sprintf("#%2506x",rand(0,16777215));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|936095|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$color = sprintf("#%06x",rand(0,16777215));
</code></pre>

blocks|key|720478|text|最短路径：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720479|echo+substr(uniqid(),-6);+//+result:+5ebf06|code-block|syntax|javascript|720480|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Shortest way:

<pre class="lang-php prettyprint-override"><code>echo substr(uniqid(),-6); // result: 5ebf06
</code></pre>

blocks|key|720487|text|我就是这么做的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720488|<?php+echo+'rgba('.rand(0,255).',+'.rand(0,255).',+'.rand(0,255).',+0.73)';+?>|code-block|syntax|javascript|720489|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is how i do it.

<pre><code>&lt;?php echo 'rgba('.rand(0,255).', '.rand(0,255).', '.rand(0,255).', 0.73)'; ?&gt;
</code></pre>

blocks|key|720547|text|如果有人想要生成浅色|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720548|sprintf('#%2506X',+mt_rand(0xFF9999,+0xFFFF00));|code-block|syntax|javascript|720549|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If someone wants to generate light colors 

<pre><code>sprintf('#%06X', mt_rand(0xFF9999, 0xFFFF00));
</code></pre>

blocks|key|936070|text|从PHP5.3开始，您可以使用openssl_random_pseudo_bytes()|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|936071|$hex_string+=+bin2hex(openssl_random_pseudo_bytes(3));|code-block|syntax|javascript|936072|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/openssl-random-pseudo-bytes^0|F|T|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

As of PHP 5.3, you can use <a href="http://php.net/openssl-random-pseudo-bytes" rel="nofollow">openssl_random_pseudo_bytes()</a>:

<pre><code>$hex_string = bin2hex(openssl_random_pseudo_bytes(3));
</code></pre>

blocks|key|936260|text|function+random_color(){++
+return+sprintf('#%2506X',+mt_rand(0,+0xFFFFFF));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|936261|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function random_color(){ 
 return sprintf('#%06X', mt_rand(0, 0xFFFFFF));
}
</code></pre>

blocks|key|720594|text|这在很大程度上是基于上面的@Galen版本，然而，我想添加范围控制，可以限制产生的颜色为红色，绿色，蓝色，更亮或更暗。它可能对其他人有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720595|function+random_colour_part($lower,+$upper)
{
++++//randomly+select+colour+in+range+and+convert+to+hexidecimal
++++return+str_pad(dechex(mt_rand($lower,+$upper)),+2,+'0',+STR_PAD_LEFT);
}

function+random_colour($colour)
{
++++//loop+through+colour
++++foreach+($colour+as+$key+=>+$value)
++++{
++++++++//retrieve+each+r,g,b+colour+range+and+generate+random+hexidecimal+colour
++++++++if+($key+==+"r")+$r+=+random_colour_part($value[0],+$value[1]);
++++++++if+($key+==+"g")+$g+=+random_colour_part($value[0],+$value[1]);
++++++++if+($key+==+"b")+$b+=+random_colour_part($value[0],+$value[1]);
++++}

++++//return+hexidecimal+colour
++++return+"#"+.+$r+.+$g+.+$b;
}

//generate+a+random+red-based+colour
echo+random_colour(["r"=>[0,255],+"g"=>[0,0],+"b"=>[0,0]]);

//generate+a+random+light+green-based+colour+(use+only+half+of+the+255+range)
echo+random_colour(["r"=>[0,0],+"g"=>[127,255],+"b"=>[0,0]]);

//generate+a+random+colour+of+any+sort
echo+random_colour(["r"=>[0,255],+"g"=>[0,255],+"b"=>[0,255]]);|code-block|syntax|javascript|720596|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is heavily based on the @Galen version above, however, I wanted to add range control that could limit the colour produced to be red, green, blue, lighter or darker. It might be of use to others.
<pre><code>function random_colour_part($lower, $upper)
{
 //randomly select colour in range and convert to hexidecimal
 return str_pad(dechex(mt_rand($lower, $upper)), 2, '0', STR_PAD_LEFT);
}

function random_colour($colour)
{
 //loop through colour
 foreach ($colour as $key =&gt; $value)
 {
 //retrieve each r,g,b colour range and generate random hexidecimal colour
 if ($key == &quot;r&quot;) $r = random_colour_part($value[0], $value[1]);
 if ($key == &quot;g&quot;) $g = random_colour_part($value[0], $value[1]);
 if ($key == &quot;b&quot;) $b = random_colour_part($value[0], $value[1]);
 }

 //return hexidecimal colour
 return &quot;#&quot; . $r . $g . $b;
}

//generate a random red-based colour
echo random_colour([&quot;r&quot;=&gt;[0,255], &quot;g&quot;=&gt;[0,0], &quot;b&quot;=&gt;[0,0]]);

//generate a random light green-based colour (use only half of the 255 range)
echo random_colour([&quot;r&quot;=&gt;[0,0], &quot;g&quot;=&gt;[127,255], &quot;b&quot;=&gt;[0,0]]);

//generate a random colour of any sort
echo random_colour([&quot;r&quot;=&gt;[0,255], &quot;g&quot;=&gt;[0,255], &quot;b&quot;=&gt;[0,255]]);
</code></pre>

blocks|key|720520|text|我想这件也不错，有什么颜色都行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720521|$color=+substr(str_shuffle('AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899'),+0,+6);|code-block|syntax|javascript|720522|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think this would be good as well it gets any color available

<pre><code>$color= substr(str_shuffle('AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899'), 0, 6);
</code></pre>

blocks|key|936361|text|function+randomRGB()
{
++++$r+=+rand(0,+255);
++++$g+=+rand(0,+255);
++++$b+=+rand(0,+255);

++++return+"rgb({$r},+{$g},+{$b})";
}

function+randomHexColor()
{
++++return+'#'+.+substr(str_shuffle('ABCDEF0123456789'),+0,+6);
}

$hexColor+=+randomHexColor();
$rgbColor+=+randomRGB();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|936362|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre class="lang-php prettyprint-override"><code>function randomRGB()
{
 $r = rand(0, 255);
 $g = rand(0, 255);
 $b = rand(0, 255);

 return &quot;rgb({$r}, {$g}, {$b})&quot;;
}

function randomHexColor()
{
 return '#' . substr(str_shuffle('ABCDEF0123456789'), 0, 6);
}

$hexColor = randomHexColor();
$rgbColor = randomRGB();
</code></pre>

I'm working on a project where I need to generate an undefined number of random, hexadecimal color codes…how would I go about building such a function in PHP?

Generating a random hex color code with PHP

我正在做一个项目，在这个项目中，我需要生成未定义数量的随机、十六进制颜色代码…我该如何在PHP中构建这样的函数？

问用PHP生成随机十六进制颜色代码
EN

回答 13

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问用PHP生成随机十六进制颜色代码EN

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问用PHP生成随机十六进制颜色代码
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