PHP generates GIF image verification code _php instance

Look at the effect chart first

The path to the font and font files needs to be set in $fontfilepath and $fontfilename in the class. Such as:

Copy Code code as follows:

private static $FontFilePath = "static/font/"; Relative to the location of this code file
private static $FontFileName = Array ("3.ttf");//Array ("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.t") TF "); //

The complete code is as follows:

Copy Code code as follows:

? Php

/**
Description: Validation code generation class, support to generate GIF image verification code (with noise, interference line, mesh, random color background, random custom fonts, tilt, gif animation)

Service side:
$mod = strtolower ($_request["mod") isset "mod"]: "");
if ($mod = = "Code") {
echo Securitycode::D Raw (4, 1,,, 5, ten, "Secode");
Die ();
}
Call: *1000)"
Verify:
$reqCode = Strtolower (Isset ($_request["Secode"]) $_request["Secode"]: ""); The requested authentication code
$sessionCode = Strtolower (Isset ($_session["Secode"]) $_session["Secode"]: ""); Session-generated authentication code
if ($reqCode!= $sessionCode) {
echo "Security Authentication code Error! ";
Die ();
}
*/
$mod = strtolower ($_request["mod") isset "mod"]: "");
if ($mod = = "Code") {
echo Securitycode::D Raw (4, MB, 2, "Secode");
Die ();
}

Security Authentication Code Class
Class Securitycode {

    private static $Debug = 0;
    private static $Code = ';
    private static $Chars = ' bcdefhkmnrstuvwxyABCDEFGHKMNPRSTUVWXY34568 ';
   //private static $Chars = ' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890 ';
    private static $TextGap = 20;
    private static $TextMargin = 5;
    private static $FontFilePath = "static/font/";//relative to the location of this code file
    Private Static $FontFileName =array ("3.ttf");//Array ("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.ttf");
    private static $Img = ' gif89a ';//gif header 6 bytes   
    PR ivate static $BUF = Array ();
    private static $LOP = 0;
    private static $DIS = 2;
    private static $COL =-1;
    private static $IMG =-1;

   /**
      generate gif picture validation
      @param int $L Authenticode length
      @param int $F generate the number of frames in GIF
      @param int $W width
      @param int $H height
      @param int $MixCnt number of interference lines
      @param int $lineGap grid line interval
      @param int $noisyCnt Bath points
      @param int $sessionName Verification Code session name
     */
     public static function Draw ($L = 4, $F = 1, $W = $H =, $MixCnt = 2, $lineGap = 0, $noisyCnt = ten, $se Ssionname = "Code") {
        ob_start ();
        Ob_clean ();

for ($i = 0; $i < $L; $i + +) {
Self:: $Code. = SubStr (self:: $Chars, Mt_rand (0, strlen (self:: $Chars)-1), 1);
}

if (!isset ($_session))
Session_Start ();
$_session[$sessionName] = Strtolower (self:: $Code);

$bgRGB = Array (rand (0, 255), rand (0, 255), rand (0, 255));
Generate a multiple-frame GIF animation
for ($i = 0; $i < $F; $i + +) {
$img = Imagecreate ($W, $H);

           //Background color
             $bgColor = imagecolorallocate ($img, $bgRGB [0], $bgRGB [1], $bgRGB [2]);
            imagecolortransparent ($img, $bgColor);
            unset ($bgColor);

Add a noise point
$maxNoisy = rand (0, $NOISYCNT);
$noisyColor = Imagecolorallocate ($img, rand (0, 255), rand (0, 255), rand (0, 255));
for ($k = 0; $k <= $maxNoisy; $k + +) {
Imagesetpixel ($img, rand (0, $W), rand (0, $H), $noisyColor);
}

Add grid


if ($lineGap &gt; 0) {


for ($m = 0; $m &lt; ($W/$LINEGAP); $m + +) {//vertical bar


Imageline ($img, $m * $lineGap, 0, $m * $lineGap, $H, $noisyColor);


}


for ($n = 0; $n &lt; ($H/$LINEGAP); $n + +) {//Horizontal line


Imageline ($img, 0, $n * $lineGap, $W, $n * $lineGap, $noisyColor);


}


}


Unset ($noisyColor);

Add interference Line


for ($k = 0; $k &lt; $MixCnt; $k + +) {


$WR = Mt_rand (0, $W);


$HR = Mt_rand (0, $W);


$lineColor = Imagecolorallocate ($img, rand (0, 255), rand (0, 255), rand (0, 255));


Imagearc ($img, $W-floor ($WR/2), Floor ($HR/2), $WR, $HR, rand (180), rand (180, 270), $lineColor);


Unset ($lineColor);


Unset ($WR, $HR);


}

First frame ignores text


if ($i!= 0 | | $F &lt;= 1) {


Text


$foreColor = Imagecolorallocate ($img, rand (0, 255), rand (0, 255), rand (0, 255));


for ($j = 0; $j &lt; $L; $j + +) {


$fontFile = self:: $FontFilePath. Self:: $FontFileName [Rand (0, COUNT (self:: $FontFileName)-1)];


if (!file_exists ($fontFile))


Imagestring ($IMG, 4, Self:: $TextMargin + $j * Self:: $TextGap, ($H-rand ($H/2, $H)), Self:: $Code [$j], $foreColor);


Else


Imagettftext ($img, Rand (a), Rand ( -15), self:: $TextMargin + $j * Self:: $TextGap, ($H-rand (7)), $foreColor, $ Fontfile, Self:: $Code [$j]);


}


Unset ($foreColor);


}

Imagegif ($IMG);
Imagedestroy ($IMG);
$Imdata [] = Ob_get_contents ();
Ob_clean ();
}

Unset ($W, $H, $B);
if (self:: $Debug) {
echo $_session[' code '];
Echo ' <pre> ', Var_dump ($Imdata), ' </pre> ';
Die ();
}
Header (' content-type:image/gif ');
Return Self::creategif ($Imdata, 20);
Unset ($Imdata);
}

private static function Creategif ($GIF _src, $GIF _dly = ten, $GIF _lop = 0, $GIF _dis = 0, $GIF _red = 0, $GIF _grn = 0, $GIF _bl U = 0, $GIF _mod = ' bin ') {


if (!is_array ($GIF _src) &amp;&amp;!is_array ($GIF _tim)) {


Throw New Exception (' Error: '. __line__. ', does not supported function for only one image!! ');


Die ();


}


Self:: $LOP = ($GIF _lop &gt; 1)? $GIF _lop:0;


Self:: $DIS = ($GIF _dis &gt; 1)? (($GIF _dis &lt; 3)? $GIF _dis:3): 2;


Self:: $COL = ($GIF _red &gt; 1 &amp;&amp; $GIF _grn &gt;-1 &amp;&amp; $GIF _blu &gt;-1)? ($GIF _red | ($GIF _grn &lt;&lt; 8) | ($GIF _blu &lt;&lt; 16)) :-1;


for ($i = 0, $src _count = count ($GIF _src); $i &lt; $src _count; $i + +) {


if (Strtolower ($GIF _mod) = = ' url ') {


Self:: $BUF [] = Fread (fopen ($GIF _src[$i], ' RB '), FileSize ($GIF _src[$i]));


} elseif (Strtolower ($GIF _mod) = = ' bin ') {


Self:: $BUF [] = $GIF _src[$i];


} else {


Throw New Exception (' Error: '. __line__. ', unintelligible flag ('. $GIF _mod. ')!');


Die ();


}


if (!) ( Substr (self:: $BUF [$i], 0, 6) = = ' gif87a ' Or Substr (self:: $BUF [$i], 0, 6) = = ' gif89a ') {


Throw New Exception (' Error: '. __line__. ', Source '. $i. ' is not a GIF image! ');


Die ();


}


for ($j = (3 * (2 &lt;&lt; (Ord (self:: $BUF [$i]{10}) &amp; 0x07)), $k = TRUE; $k; $j + +) {


Switch (self:: $BUF [$i]{$j}) {


Case '! ':


if (substr (self:: $BUF [$i], ($j + 3), 8) = = ' NETSCAPE ') {


Throw New Exception (' Error: '. __line__. ', could not-animation from animated GIF source ('. ($i + 1). ')!');


Die ();


}


Break


Case '; ':


$k = FALSE;


Break


}


}


}


Self::addheader ();


for ($i = 0, $count _buf = count (self:: $BUF); $i &lt; $count _buf; $i + +) {


Self::addframes ($i, $GIF _dly);


}


Self:: $Img. = '; ';


Return (self:: $IMG);


}

private static function AddHeader () {
$i = 0;
if (Ord (self:: $BUF [0]{10}) & 0x80) {
$i = 3 * (2 << (Ord (self:: $BUF [0]{10}) & 0x07));
Self:: $Img. = substr (self:: $BUF [0], 6, 7);
Self:: $Img. = substr (self:: $BUF [0], $i);
Self:: $Img. = "!\377\13netscape2.0\3\1". Chr (self:: $LOP & 0xFF). Chr (self:: $LOP >> 8) & 0xFF). "The";
}
Unset ($i);
}

private static function Addframes ($i, $d) {


$L _STR = + 3 * (2 &lt;&lt; (Ord (self:: $BUF [$i]{10}) &amp; 0x07));


$L _end = strlen (self:: $BUF [$i])-$L _str-1;


$L _tmp = substr (self:: $BUF [$i], $L _str, $L _end);


$G _len = 2 &lt;&lt; (ord (self:: $BUF [0]{10}) &amp; 0x07);


$L _len = 2 &lt;&lt; (ord (self:: $BUF [$i]{10}) &amp; 0x07);


$G _rgb = substr (self:: $BUF [0], 3 * (2 &lt;&lt; (Ord (self:: $BUF [0]{10}) &amp; 0x07)));


$L _rgb = substr (self:: $BUF [$i], 3 * (2 &lt;&lt; (Ord (self:: $BUF [$i]{10}) &amp; 0x07));


$L _ext = "!\xf9\x04". Chr (self:: $DIS &lt;&lt; 2) + 0). Chr ($d &gt;&gt; 0) &amp; 0xFF). Chr ($d &gt;&gt; 8) &amp; 0xFF). "\x0\x0";


if (self:: $COL &gt; 1 &amp;&amp; ord (self:: $BUF [$i]{10}) &amp; 0x80) {


for ($j = 0; $j &lt; (2 &lt;&lt; (Ord (self:: $BUF [$i]{10}) &amp; 0x07); $j + +) {


if (ORD ($L _rgb{3 * $j + 0}) = = (self:: $COL &gt;&gt; 0) &amp; 0xFF &amp;&amp; ord ($L _rgb{3 * $j + 1}) = = (self:: $COL &GT;&G T 8 &amp; 0xFF &amp;&amp; ord ($L _rgb{3 * $j + 2}) = = (self:: $COL &gt;&gt;) &amp; 0xFF) {


$L _ext = "!\xf9\x04". Chr (self:: $DIS &lt;&lt; 2) + 1). Chr ($d &gt;&gt; 0) &amp; 0xFF). Chr ($d &gt;&gt; 8) &amp; 0xFF). Chr ($j). "\x0";


Break


}


}


}


Switch ($L _tmp{0}) {


Case '! ':


$L _img = substr ($L _tmp, 8, 10);


$L _tmp = substr ($L _tmp, strlen ($L _tmp)-18);


Break


Case ', ':


$L _img = substr ($L _tmp, 0, 10);


$L _tmp = substr ($L _tmp, strlen ($L _tmp)-10);


Break


}


if (Ord (self:: $BUF [$i]{10}) &amp; 0x80 &amp;&amp; self:: $IMG &gt;-1) {


if ($G _len = = $L _len) {


if (Self::compare ($G _rgb, $L _rgb, $G _len)) {


Self:: $Img. = ($L _ext. $L _img. $L _tmp);


} else {


$byte = Ord ($L _img{9});


$byte |= 0x80;


$byte &amp;= 0xf8;


$byte |= (Ord (self:: $BUF [0]{10}) &amp; 0x07);


$L _img{9} = Chr ($byte);


Self:: $Img. = ($L _ext. $L _img. $L _rgb. $L _tmp);


}


} else {


$byte = Ord ($L _img{9});


$byte |= 0x80;


$byte &amp;= 0xf8;


$byte |= (Ord (self:: $BUF [$i]{10}) &amp; 0x07);


$L _img{9} = Chr ($byte);


Self:: $Img. = ($L _ext. $L _img. $L _rgb. $L _tmp);


}


} else {


Self:: $Img. = ($L _ext. $L _img. $L _tmp);


}


Self:: $IMG = 1;


}

private static function Compare ($G _block, $L _block, $Len) {
for ($i = 0; $i < $Len; $i + +) {
if ($G _block{3 * $i + 0}!= $L _block{3 * $i + 0} | | $G _block{3 * $i + 1}!= $L _block{3 * $i + 1} | | $G _block{3 * $i + 2}! = $L _block{3 * $i + 2}) {
return (0);
}
}
return (1);
}

}

The usage is in the comment at the beginning of the class.