PHP Verification Code class PHP Verification code

/** * Universal Verification Code Class img.php * Version: V0.1 * bbs.it-home.org 2013/3/1 */ Class Validatecode { Private $charset = "abcdefghizklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; Random factor Private $code; Verification Code Text Private $codelen = 4; Verification code displays several text Private $width = 130; Verification Code width Private $height = 50; Verification Code Height Private $img; Validation code resource handle Private $font; The specified font Private $fontsize = 20; The specified font size Private $fontcolor; Font Color random Construct a class to write fonts Public Function __construct () { $this->font=root_path. ' /font/elephant.ttf '; } Create 4 random Codes Private Function Createcode () { $_leng=strlen ($this->charset); for ($i =1; $i <= $this->codelen; $i +) { $this->code.= $this->charset[mt_rand (0,$_leng)]; } return $this->code; } Create a background Private Function Createbg () { Create a canvas for a resource jubing $this->img=imagecreatetruecolor ($this->width, $this->height); Background color $color =imagecolorallocate ($this->img,mt_rand (157,255), Mt_rand (157,255), Mt_rand (157,255)); Draw a rectangle Imagefilledrectangle ($this->img,0, $this->height, $this->width,0, $color); } Creating fonts Private Function CreateFont () { $_x= ($this->width/$this->codelen); Font length for ($i =0; $i < $this->codelen; $i +) { Text color $color =imagecolorallocate ($this->img,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156)); Resource handle font size tilt font length font height font Color font specific text Imagettftext ($this->img, $this->fontsize,mt_rand ( -30,30), $_x* $i +mt_rand (1,5), $this->height/1.4, $color, $this->font, $this->code[$i]); } } Random lines Private Function Createline () { Random lines for ($i =0; $i <6; $i + +) { $color = Imagecolorallocate ($this->img,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156)); Imageline ($this->img,mt_rand (0, $this->width), Mt_rand (0, $this->height), Mt_rand (0, $this->width), Mt_ Rand (0, $this->height), $color); } Random Snowflakes for ($i =0; $i <45; $i + +) { $color = Imagecolorallocate ($this->img,mt_rand (220,255), Mt_rand (220,255), Mt_rand (220,255)); Imagestring ($this->img,mt_rand (1,5), Mt_rand (0, $this->width), Mt_rand (0, $this->height), ' * ', $color); } } Output background Private Function OutPut () { Generate headers Header (' contenttype:img/png '); Output picture Imagepng ($this->img); Destroying result sets Imagedestroy ($this->img); } External output Public Function doimg () { Load background $this->CREATEBG (); Loading files $this->createcode (); Loading lines $this->createline (); Loading fonts $this->createfont (); Load background $this->output (); } Get Verification Code Public Function GetCode () { Return Strtolower ($this->code); } } ?> Copy Code Invocation Example: index.php for you to recommend a few articles about PHP verification code: PHP Random Verification code PHP generated random verification Code (graphics) with a snowflake background verification code PHP write a verification code PHP to generate a code of dynamic picture Verification code

