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code.php:
1<?PHP2 //Verification Code Production3 //File header ...4 Header("Content-type:image/png"); 5 //Create True Color white paper6 $im= @imagecreatetruecolor (.) or die("Build image Failed"); 7 //Get background color8 $background _color= Imagecolorallocate ($im, 255, 255, 255); 9 //Fill the background color (this thing is like oil barrels)TenImagefill ($im, 0, 0,$background _color); One //Get Border color A $border _color= Imagecolorallocate ($im, 200,200,200); - //Draw Rectangle, border color 200,200,200 -Imagerectangle ($im, 0,0,49,19,$border _color); the - //line up background, full screen with 1 or 0 - for($i= 2;$i<18;$i++){ - //get random tint + $line _color= Imagecolorallocate ($im,Rand(200,255),Rand(200,255),Rand(200,255)); - //Draw Line +Imageline ($im, 2,$i, 47,$i,$line _color); A } at - //Set Font size - $font _size=12; - - //set up the printed text - $Str[0] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; in $Str[1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; - $Str[2] = "01234567891234567890123456"; to + //get a 1th random text - $imstr[0] ["s"] =$Str[Rand(0,2)] [Rand(0,25)]; the $imstr[0] ["x"] =Rand(2,5); * $imstr[0] ["y"] =Rand(1,4); $ Panax Notoginseng //get a 2nd random text - $imstr[1] ["s"] =$Str[Rand(0,2)] [Rand(0,25)]; the $imstr[1] ["x"] =$imstr[0] ["X"]+$font _size-1+Rand(0,1); + $imstr[1] ["y"] =Rand(1,3); A the //get a 3rd random text + $imstr[2] ["s"] =$Str[Rand(0,2)] [Rand(0,25)]; - $imstr[2] ["x"] =$imstr[1] ["X"]+$font _size-1+Rand(0,1); $ $imstr[2] ["y"] =Rand(1,4); $ - //get a 4th random text - $imstr[3] ["s"] =$Str[Rand(0,2)] [Rand(0,25)]; the $imstr[3] ["x"] =$imstr[2] ["X"]+$font _size-1+Rand(0,1); - $imstr[3] ["y"] =Rand(1,3); Wuyi the //Write random string - for($i= 0;$i<4;$i++){ Wu //get a random darker color - $text _color= Imagecolorallocate ($im,Rand(50,180),Rand(50,180),Rand(50,180)); About //Drawing Text $Imagechar ($im,$font _size,$imstr[$i["X"],$imstr[$i["Y"],$imstr[$i["s"],$text _color); - } - - //Show Pictures AImagepng ($im); + //Destroying pictures theImagedestroy ($im); -?>
HTML to invoke:
1 <HTML>2 <Head>3 <title>Example of picture verification</title>4 <styletype= "Text/css">5 </style>6 </Head> 7 <Body>8 <formID= "Login"Action=""Method= "POST">9 <P>This example verifies that the instance</P>Ten <P> One <span>Verification Code:</span> A <inputtype= "text"name= "Validate"value=""size=10> - <imgtitle= "Click to refresh"src= "code.php"></img> - </P> the <P> - <inputtype= "Submit"> - </P> - </form>
PHP Generate Verification Code
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