Php's method of converting colors into their reversed colors

This article mainly introduces how php converts colors into their reversed colors, and involves related techniques for operating color values in php, for more information, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

This php code converts a color to the opposite color encoding, for example, white to black, and blue to yellow.

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;} // example: // black-> whiteprint color_inverse ('#000000 '); // --> returns # ffffff // blue-> yellowprint color_inverse ('# 0000FF'); // --> # FFFF00

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