PHP generates a verification code with interference lines, interference points, character skew

Source: Internet
Author: User

PHP generates verification code class code, this verification code class supports the generation of interference points, interference lines and other interfering pixels, also can make the character tilt. In a class you can define parameters such as the width, height, length, tilt angle of the captcha, and then use the following:

<?PHPclassclass_authcode{ Public  $authcode= ";//Verification Code    Private $width= ";//Verification Code Picture width    Private $height= ";//Verification Code Picture High    Private $len= ";//Verification Code Length    Private $tilt=Array( -30,30);//Verification Code Tilt Angle    Private $font= ' Altehaasgroteskbold.ttf ';//Font Files    Private $str= ";//Verification code Base    Private $im= ";//Create a handle//constructor for a picture    function__construct ($width=100,$heigh=30,$len=4) {        $this->width =$width; $this->height =$heigh; $this->len =$len; $this->str = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz '; $str _len=strlen($this-&GT;STR)-1;  for($i= 0;$i<$len;$i++) {            $this->authcode. =$this->str[Rand(0,$str _len)]; }    }    //generate a Captcha picture    Private functionimagecreate () {$this->im = Imagecreatetruecolor ($this->width,$this-height); }    //Interference Color    Private functionExt_color () {returnImagecolorallocate ($this->im,Rand(50, 180),Rand(50, 180),Rand(50, 180)); }    //Generating Interference points    Private functionExt_point () { for($i= 0;$i<$this->width*2;$i++) {Imagesetpixel ($this->im,Rand(1,$this-&GT;WIDTH-1),Rand(1,$this-&GT;HEIGHT-1),$this-Ext_color ()); }    }    //Generate interference Lines    Private functionExt_line () { for($i= 0;$i<$this->len;$i++) {            $x 1=Rand(1,$this->width-1); $y 1=Rand(1,$this->height-1); $x 2=Rand(1,$this->width-1); $y 2=Rand(1,$this->height-1); Imageline ($this->im,$x 1,$y 1,$x 2,$y 2,$this-Ext_color ()); }    }    //write the verification code to the picture (cannot be used in conjunction with $this->imgstrfloat ())    Private functionImgstr () {$old _x= 1;  for($i= 0;$i<$this->len;$i++) {            $fontsize=Rand(2,5);//Font Size            $tmp _1=$fontsize*2.5; $tmp _2=$i>0$tmp _1: 0; $y=Rand(1,$this->height/2); $x=Rand($old _x+$tmp _2, ($i+1) * ($this->width)/$this->len-$tmp _1); $old _x=$x; $color= Imagecolorallocate ($this->im,Rand(200, 255),Rand(200, 255),Rand(200, 255)); Imagestring ($this->im,$fontsize,$x,$y,$this->authcode[$i],$color); }    }    //tilt the verification code to the picture (note that this cannot be used in conjunction with the $THIS->IMGSTR () method)    Private functionimgstrfloat () {$old _x= 1;  for($i= 0;$i<$this->len;$i++) {            $fontfloat=Rand($this->tilt[0],$this->tilt[1]); $fontsize=Rand(10,15);//Font Size            $tmp _1=$i>0$fontsize: 0; $y=Rand($fontsize+2,$this->height-2); $x=Rand($old _x+$tmp _1+2, ($i+1) * ($this->width)/$this->len-$fontsize-2); $old _x=$x; $color= Imagecolorallocate ($this->im,Rand(200, 255),Rand(200, 255),Rand(200, 255)); Imagettftext ($this->im,$fontsize,$fontfloat,$x,$y,$color,$this->font,$this->authcode[$i]); }    }    //output Verification Code picture    functionoutput () {$this-imagecreate (); $this-Imgstr (); //$this->imgstrfloat ();        $this-Ext_point (); $this-Ext_line (); Header(' Content-type:image/png '); Imagepng ($this-im); Imagedestroy ($this-im); }}?>

Description of the Code usage:

$obj new Class_authcode (); // instantiate the object and set the width, height, and length of the verification code for the CAPTCHA image $obj-$authcode// Get Verification code $obj// output captcha picture

PHP generates a verification code with interference lines, interference points, character skew

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