PHP - Color Opposition

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Added by thebman220 on January-29-2009, 3:04 am

Finds the most suitable foreground color for a given background color.

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This functions works by counting the number of light channels (values greater than 127). It then returns black if there are 2 or more light channels or black otherwise.

function opposite($color) {
   $white=0;
   for ($i=0; $i<6; $i+=2) {
      $white+=base_convert(substr($color,$i,2),16,10)>127?1:0;
   }
   return $white>=2?"000000":"ffffff";
}

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