Generating a random hex color code with PHP

Question

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

User · Answer

you can use md5 for that purpose very short   color   substr md5 rand     0  6

User · Answer

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

User · Answer

function random color       return sprintf    06X   mt rand 0  0xFFFFFF

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I think this would be good as well it gets any color available   color  substr str shuffle  AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899AABBCCDDEEFF00112233445566778899    0  6

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This is how i do it    lt  php echo  rgba   rand 0 255       rand 0 255       rand 0 255     0 73      gt

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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   function rand color         return       str pad dechex mt rand 0  0xFFFFFF    6   0   STR PAD LEFT       or   function rand color         return sprintf    06X   mt rand 0  0xFFFFFF

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Valid hex colors can contain 0 to 9 and A to F so if we create a string with those characters and then shuffle it  we can grab the first 6 characters to create a random hex color code  An example is below   code  echo       substr str shuffle  ABCDEF0123456789    0  6     I tested this in a while loop and generated 10 000 unique colors   code I used to generate 10 000 unique colors    colors   array    while  true        color            substr str shuffle  ABCDEF0123456789    0  6       colors  color           color     if   count  colors     10000           echo implode PHP EOL   colors         break           Which gave me these random colors as the result     outis pointed out that my first example couldn t generate hexadecimals such as  4488CC  so I created a function which would be able to generate hexadecimals like that   code  function randomHex         chars    ABCDEF0123456789       color           for    i   0   i  lt  6   i              color     chars rand 0  strlen  chars  - 1            return  color     echo randomHex        The second example would be better to use because it can return a lot more different results than the first example  but if you aren t going to generate a lot of color codes then the first example would work just fine

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Web-safe colors are no longer necessary  nor a valid concept  even  as even mobile devices have 16  bit colour these days   See Wikipedia for more info   In other words  use any colour from  000000 to  FFFFFF   edit  Dear downvoters  Check the edit history for the question first

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As of PHP 5 3  you can use openssl random pseudo bytes      hex string   bin2hex openssl random pseudo bytes 3

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rand   str pad dechex rand 0x000000  0xFFFFFF    6  0  STR PAD LEFT   echo        rand     You can change rand   in for mt rand   if you want  and you can put strtoupper   around the str pad   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

User · Answer

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  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

User · Answer

Shortest way   echo substr uniqid   -6      result  5ebf06

User · Answer

color   sprintf    06x  rand 0 16777215

User · Answer

If someone wants to generate light colors   sprintf    06X   mt rand 0xFF9999  0xFFFF00

[php] Generating a random hex color code with PHP

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