PHP convert color to its inverse color method

Source: Internet
Author: User
Tags php code strlen

This article mainly introduced the PHP conversion color for its inverse color method, involves the PHP operation color numerical related skill, needs the friend to be possible to refer to under

The example of this article describes the way in which PHP converts color to its inverse color. Share to everyone for your reference. The specific analysis is as follows:

This PHP code can turn a color into the opposite color code, such as: White Turns black, blue turns yellow

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17-18 function Color_inverse ($color) {$color = Str_replace (' # ', ', $color); if (strlen ($color)!= 6) {return ' 000000 ';} $rgb = ''; For ($x =0 $x <3; $x + +) {$c = 255-hexdec (substr ($color, (2* $x), 2); $c = ($c < 0) 0:dechex ($c); $rgb. = (strlen ($c ) < 2)? ' 0 '. $c: $c; Return ' # ' $rgb; //Use Example://Black-> white print color_inverse (' #000000 '); --> returns #ffffff//Blue-> yellow print color_inverse (' #0000FF '); --> #FFFF00

I hope this article will help you with your PHP program design.

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