PHP Brief Verification Code

PHP Simple Verification Code



Class Verifyimg {
Public $fontSize = 15; Define font Size
Public $length = 4; Defining string Lengths
Public $width = 70; Define picture width
Public $height = 30; Define picture Height
public $im = null; Create a picture that specifies a wide height
Public $font = ' C:/windows/fonts/arial.ttf ';
Public $strNum = "";
Public Function Build () {
$strings = Array (' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' h ', ' I ', ' j ', ' K ', ' m ', ' n ', ' P ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x ', ' Y ');
$strNum = "";
$count = count ($strings);
for ($i = 1; $i <= $this->length; $i + +) {//loop random character generation string
$strNum. = $strings [rand (0, $count-1)];
}
Session_Start ();
$_session ["verifycode"] = $strNum;
$this->im = imagecreate ($this->width, $this->height);
$backgroundcolor = Imagecolorallocate ($this->im, 255, 255, 255); Generate Background color
$frameColor = Imagecolorallocate ($this->im, 0, 255, 0);
for ($i = 0; $i < $this->length; $i + +) {
$charY = ($this->height + 9)/2 + rand (-1, 1); Defining the y-coordinate of characters
$charX = $i * 15 + 8; Defining character X coordinates
$text _color = imagecolorallocate ($this->im, 255, 0, 0); Generate character Color
$text _color = imagecolorallocate ($this->im, Mt_rand (255), Mt_rand (50, 200));
$angle = rand (-20, 20); Create a character angle
Write characters
Imagettftext ($this->im, $this->fontsize, $angle, $charX, $charY, $text _color, $this->font, $strNum [$i]);
}
for ($i = 0; $i <= 5; $i + +) {//cycle draw background line
$linecolor = Imagecolorallocate ($this->im, Mt_rand (0, 255), Mt_rand (0, 255), Mt_rand (0, 255));
$linex = Mt_rand (1, $this->width-1);
$liney = Mt_rand (1, $this->height-1);
Imageline ($this->im, $linex, $liney, $linex + mt_rand (0, 4)-2, $liney + mt_rand (0, 4)-2, $linecolor);
}
for ($i = 0; $i <=; $i + +) {//cycle draw background points, create a pitting effect
$pointcolor = Imagecolorallocate ($this->im, Mt_rand (0, 255), Mt_rand (0, 255), Mt_rand (0, 255));
Imagesetpixel ($this->im, Mt_rand (1, $this->width-1), Mt_rand (1, $this->height-1), $pointcolor);
}
Imagerectangle ($this->im, 0, 0, $this->width-1, $this->height-1, $frameColor); Draw Border
Ob_clean ();
Header (' content-type:image/png ');
Imagepng ($this->im);
Imagedestroy ($this->im);
}
}
$img = new Verifyimg ();
$img->build ();
?> (fblww-0103)

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