Simple verification code generation, simple verification code Generation _php Tutorial

Simple verification code generation, simple verification code generation

for ($i =0; $i <5; $i + +) {

$rand. = Dechex (rand (1,15));//random number 16 binary 1-f generate 5

}

$im = Imagecreatetruecolor(+);//size of verification code (artboard)

$BG = Imagecolorallocate($im, 0,0,0);//Background color

For ($i <0; $i <$i + +) {

$color _dian = imagecolorallocate ($im, rand (0,255),rand (0,255),rand (0, 255));

Imagesetpixel ($im, rand ()%, rand ()%, $color _dian);//Draw points on the artboard

}

$color _font = imagecolorallocate ($im, rand (255), rand ( 255), Rand ( 255)); Set color for color text

$color _line = imagecolorallocate ($im, rand (0,255),rand (0,255),rand (0 ,255)); Set the color of a color line

Imageline ($im, rand (1,Ten), rand (5,), rand (+ 5,15) , $color _line); The x-axis, y-axis, end x-axis, y-axis, and assigned color of the thread starting from the second parameter

Imagestring ($im, 5,rand (4,60), Rand (3,10), $rand, $color _font); Write the generated code on the artboard properties of the font starting from the second argument, position displayed on the artboard x-axis, y-axis, random captcha, color

Imagettftext ($im, a, 0, a, a, $color _font, ' Haha.ttf ', "I'm Ruthless"); write on the artboard

Header("Content-type:image/jpeg");//Declare what is to be output

Imagejpeg($im);//output image to browser in JPEG format

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