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Get opposite color text of any background color

<?php

function randomcolor()
{
    
$myrandomcolor  "#";
    for (
$i=1$i<=3$i++)
        {
            
$x rand(0,255);
            
$x dechex($x);
            
$x strtoupper($x);
            if (
strlen($x) == 1)
            {
                
$x "0".$x;
            }
            
$myrandomcolor  .= $x;
        }
    return 
$myrandomcolor;
}

$color_backgr=randomcolor();
$nrcolor_backgr=preg_replace("/[^0-9,^A-Z]/","",$color_backgr);

$nrc=hexdec($nrcolor_backgr);
$r=$nrc >> 16 0xff;
$g=$nrc >> 0xff;
$b=$nrc 0xff;

$rc=$r 0xff;
$gc=$g 0xff;
$bc=$b 0xff;

$oppositeColor=( $rc << 16 ) | ( $gc << ) | $bc;

$oppositeColor="#".substr("000000".dechex($oppositeColor),-6);

$color_text=$oppositeColor;

echo 
$color_text;

?>


Color text code: #540439
Color background code: #ABFBC6
Example: Test

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