PHP generated distorted angular support Chinese image Verification code function _php Tutorial

PHP generated distorted angular support image verification code function in Chinese

!--? php
function make_rand ($length = "32") {//Captcha literal generation function
$str = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 ";
$result = "";
for ($i =0; $i < $length; $i + +) {
$num [$i]=rand (0,61);
$result. = $str [$num [$i]];
}
return $result;
}
$checkcode = Make_rand (5);
$im _x=160;
$im _y=32;
Function Make_crand ($length = "5") {
$string = ';
for ($i =0; $i < $length; $i + +) {
$string. = Chr (rand (0XB0,0XF7)). Chr (rand (0XA1,0XFE));
}
return $string;
}
Function Getauthimage ($text, $im _x =, $im _y = +) {
$im = Imagecreatetruecolor ($im _x, $im _y);
$text _c = imagecolorallocate ($im, Mt_rand (0,100), Mt_rand (0,100), Mt_rand (0,100));
$tmpC 0=mt_rand (100,255);
$tmpC 1=mt_rand (100,255);
$tmpC 2=mt_rand (100,255);
$buttum _c = imagecolorallocate ($im, $tmpC 0, $tmpC 1, $tmpC 2);
Imagefill ($im, $buttum _c);
//echo $text;
$font = ' C:WINDOWSFONTSSIMSUN.TTC ';
//echo strlen ($text);

$text =iconv ("gb2312", "UTF-8", $text);
//echo Mb_strlen ($text, "UTF-8");
for ($i =0; $i {
$tmp =mb_substr ($text, $i, 1, "UTF-8");
$array = Array ( -1,0,1);
$p = Array_rand ($array);
$an = $array [$p]*mt_rand (1,9);//Angle
$size = 20;
Imagettftext ($im, $size, $an, + + $i * $size *2,25, $text _c, $font, $tmp);
}

$distortion _im = Imagecreatetruecolor ($im _x, $im _y);
Imagefill ($distortion _im, $buttum _c);
for ($i =0; $i < $im _x; $i + +) {
for ($j =0; $j < $im _y; $j + +) {
$rgb = Imagecolorat ($im, $i, $j);
if ((int) ($i +20+sin ($j/$im _y*2*m_pi) *10) <= imagesx ($distortion _im) && (int) ($i +20+sin ($j/$im _y*2*m_ PI) (*10) >=0) {
Imagesetpixel ($distortion _im, (int) ($i +10+sin ($j/$im _y*2*m_pi-m_pi*0.5) *), $j, $rgb);
}
}
}
//add interfering pixels;
$count = number of 600;//interfering pixels
for ($i =0; $i < $count; $i + +) {
$randcolor = imagecolorallocate ($distortion _im,mt_ Rand (0,255), Mt_rand (0,255), Mt_rand (0,255));
Imagesetpixel ($distortion _im, Mt_rand ()% $im _x, Mt_rand ()% $im _y, $randcolor);
}

$line _c=5;
Imageline
for ($i =0; $i < $line _c; $i + +) {
$linecolor = Imagecolorallocate ($distortion _im, 17, 158, 20);
$lefty = Mt_rand (1, $im _x-1);
$righty = Mt_rand (1, $im _y-1);
Imageline ($distortion _im, 0, $lefty, Imagesx ($distortion _im), $righty, $linecolor);
}

Header ("Content-type:image/png");

Export the image to a browser or file in PNG format;
Imagepng ($im);
Imagepng ($distortion _im);

Destroys an image, releasing the memory associated with image;
Imagedestroy ($distortion _im);
Imagedestroy ($im);
}

Getauthimage (Make_crand (5));

?>

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