211 lines
7.2 KiB
PHP
211 lines
7.2 KiB
PHP
<?php
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class captcha{
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var $alphabet = "0123456789"; // ÍÅ ÈÇÌÅÍßÉÒÅ, åñëè âû íå èçìåíÿëè ôàéë øðèôòîâ!
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var $fontsdir = 'fonts';
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var $width = 120;
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var $height = 50;
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var $fluctuation_amplitude = 2;
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var $no_spaces = false;
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var $jpeg_quality = 70; // ìàêñèìàëüíîå, ìîæíî ïîñòàâèòü 70-80
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var $keystring = ''; // êëþ÷åâàÿ ãåíåðèðóåìàÿ ñòðîêà
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var $allowed_symbols = "0123456789"; // èñïîëüçóåìûå öèôðû
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var $length_min = 3; // ìèíèìàëüíîå
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var $length_max = 3; // ìàêñèìàëüíîå
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var $length = 0; // äëèíà áóäåò ñãåíåðèðîâàíà
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function genstring() {
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$length = mt_rand( $this->length_min, $this->length_max );
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$this->length = $length;
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$this->keystring = '';
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for ($i = 0; $i < $length ; $i++) {
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// â öèêëå äîáàâëÿåì ê ñòðîêå ïî 1 ñëó÷àéíîìó ñèìâîëó
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$this->keystring .= $this->allowed_symbols{ mt_rand( 0, strlen( $this->allowed_symbols ) -1 ) };
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}}
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function genimage() {
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$foreground_color = array( 100, 130, 200 );
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$background_color = array( 255, 255, 255 );
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$fonts = array();
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$fontsdir_absolute = dirname( __FILE__ ).'/'.$this->fontsdir; // ïóòü ê ïàïêå ñ øðèôòàìè
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if ($handle = opendir( $fontsdir_absolute )) { // ñîçäàåì ìàññèâ ñ ïîëíûìè ïóòÿìè ê èçîáðàæåíèÿì ñ øðèôòàìè
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while (false !== ($file = readdir( $handle ))) {
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if (preg_match( '/\.png$/i', $file )) {
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$fonts[] = $fontsdir_absolute.'/'.$file;
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}}
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closedir( $handle );
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}
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$alphabet_length = strlen( $this->alphabet );
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while (true) {
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$font_file = $fonts[mt_rand( 0, count( $fonts ) - 1 )];
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$font = imagecreatefrompng( $font_file );
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$black = imagecolorallocate( $font, 0, 0, 0 );
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$fontfile_width = imagesx( $font );
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$fontfile_height = imagesy( $font ) - 1;
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$font_metrics = array();
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$symbol = 0;
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$reading_symbol = false;
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// çàãðóçêà øðèôòà
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for ($i = 0; $i < $fontfile_width && $symbol < $alphabet_length; $i++) {
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$transparent = (imagecolorat( $font, $i, 0 ) >> 24) == 127;
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if (!$reading_symbol && !$transparent) {
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$font_metrics[$this->alphabet{$symbol}] = array( 'start' => $i );
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$reading_symbol = true;
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continue;
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}
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if ($reading_symbol && $transparent) {
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$font_metrics[$this->alphabet{$symbol}]['end'] = $i;
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$reading_symbol = false;
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$symbol++;
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continue;
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}
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}
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$img = imagecreatetruecolor( $this->width, $this->height );
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$white = imagecolorallocate( $img, 100, 130, 200 );
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$black = imagecolorallocate( $img, 100, 130, 200 );
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imagefilledrectangle( $img, 0, 0, $this->width - 1, $this->height - 1, $white );
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// íàíåñåíèå òåêñòà
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$x = 1;
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$shift = 0;
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for ($i = 0; $i < $this->length; $i++) {
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$m = $font_metrics[$this->keystring{$i}];
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$y = mt_rand( -$this->fluctuation_amplitude, $this->fluctuation_amplitude ) + ($this->height - $fontfile_height) / 2 + 2;
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if ($this->no_spaces) {
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$shift = 0;
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if ($i > 0) {
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$shift = 1000;
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for ($sy = 1; $sy < $fontfile_height - 15; $sy += 2) {
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for ($sx = $m['start'] - 1; $sx < $m['end']; $sx++) {
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$rgb = imagecolorat( $font, $sx, $sy );
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$opacity = $rgb >> 24;
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if ($opacity < 127) {
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$left = $sx - $m['start'] + $x;
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$py = $sy + $y;
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for ($px = min( $left, $this->width - 1 ); $px > $left - 20 && $px >= 0; $px--) {
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$color = imagecolorat( $img, $px, $py ) & 0xff;
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if ($color + $opacity < 190) {
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if ($shift > $left-$px) {
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$shift = $left - $px;
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}
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break;
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}
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}
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break;
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}
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}
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}
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}
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} else {$shift = 1;}
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imagecopy( $img, $font, $x - $shift, $y, $m['start'], 1, $m['end'] - $m['start'], $fontfile_height );
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$x += $m['end'] - $m['start'] - $shift;
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}
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if ($x < $this->width - 10) break; // fit in canvas
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}
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$center = $x/2;
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$img2=imagecreatetruecolor($this->width, $this->height);
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$foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
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$background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
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imagefilledrectangle($img2, 0, $this->height, $this->width, $this->height+12, $foreground);
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// ïåðèîäû
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$rand1 = 0;
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$rand2 = 0;
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$rand3 = 0;
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$rand4 = 0;
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// ôàçû
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$rand5 = 0;
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$rand6 = 0;
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$rand7 = 0;
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$rand8 = 0;
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// àìïëèòóäû
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$rand9 = 0;
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$rand10 = 0;
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//âîëíîâîå èñêàæåíèå
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for ($x = 0; $x < $this->width; $x++) {
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for ($y = 0; $y < $this->height; $y++) {
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$sx = $x + (sin( $x * $rand1 + $rand5 ) + sin( $y * $rand3 + $rand6 )) * $rand9 - $this->width / 2 + $center + 1;
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$sy = $y + (sin( $x * $rand2 + $rand7 ) + sin( $y * $rand4 + $rand8 )) * $rand10;
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if ($sx < 0 || $sy < 0 || $sx >= $this->width - 1 || $sy >= $this->height - 1) {
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$color = 200;
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$color_x = 200;
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$color_y = 200;
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$color_xy = 200;
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} else {
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$color = imagecolorat( $img, $sx, $sy ) & 0xFF;
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$color_x = imagecolorat( $img, $sx + 1, $sy ) & 0xFF;
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$color_y = imagecolorat( $img, $sx, $sy + 1 ) & 0xFF;
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$color_xy = imagecolorat( $img, $sx + 1, $sy + 1 ) & 0xFF;
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}
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if ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) {
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$newred = $foreground_color[0];
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$newgreen = $foreground_color[1];
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$newblue = $foreground_color[2];
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} else if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) {
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$newred = $background_color[0];
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$newgreen = $background_color[1];
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$newblue = $background_color[2];
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} else {
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$frsx = $sx - floor( $sx );
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$frsy = $sy - floor( $sy );
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$frsx1 = 1 - $frsx;
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$frsy1 = 1 - $frsy;
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$newcolor = (
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$color * $frsx1 * $frsy1 +
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$color_x * $frsx * $frsy1 +
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$color_y * $frsx1 * $frsy +
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$color_xy * $frsx * $frsy);
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if ($newcolor > 255) $newcolor = 255;
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$newcolor = $newcolor / 255;
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$newcolor0 = 1 - $newcolor;
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$newred = $newcolor0 * $foreground_color[0] + $newcolor * $background_color[0];
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$newgreen = $newcolor0 * $foreground_color[1] + $newcolor * $background_color[1];
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$newblue = $newcolor0 * $foreground_color[2] + $newcolor * $background_color[2];
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}
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imagesetpixel( $img2, $x, $y, imagecolorallocate( $img2, $newred, $newgreen, $newblue ) );
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}}
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# Ðàìêà
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imageline( $img2, 0, 0, $this->width, 0, $foreground );
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imageline( $img2, 0, 0, 0, $this->height, $foreground );
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imageline( $img2, 0, $this->height-1, $this->width, $this->height-1, $foreground );
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imageline( $img2, $this->width-1, 0, $this->width-1, $this->height, $foreground);
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header( "Expires: Tue, 11 Jun 1985 05:00:00 GMT" );
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header( "Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . " GMT" );
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header( "Cache-Control: no-store, no-cache, must-revalidate" );
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header( "Cache-Control: post-check=0, pre-check=0", false );
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header( "Pragma: no-cache" );
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if (function_exists ('imagepng')) {
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header ('Content-type: image/png');
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imagepng ($img2, null);
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} elseif (function_exists ('imagegif')) {
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header ('Content-type: image/gif');
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imagegif ($img2, null);
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} elseif (function_exists('imagejpeg')) {
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header( "Content-Type: image/jpeg" );
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imagejpeg($img2, null, $this->jpeg_quality);
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}
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imagedestroy($img2);
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}
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}
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?>
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