A verification code written by PHP

Session_Start (); $image = Imagecreatetruecolor (58,22); $color _background = imagecolorallocate ($image, 255,255,255); Imagefill ($image, 0,0, $color _background); $key = Array ( ' 0′, ' 1′, ' 2′, ' 3′, ' 4′, ' 5′, ' 6′, ' 7′, ' 8′, ' 9′, ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x ', ' y ', ' z ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' I ', ' J ', ' K ', ' L ', ' M ', ' N ', ' O ', ' P ', ' Q ', ' R ', ' S ', ' T ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z '); $string = null; $char _x = 6; $char _y = 0; for ($i =0; $i <4; $i + +) { $char _y = Mt_rand (0,5); $char = $key [Mt_rand (0,61)]; $string. = $char; $color _char = imagecolorallocate ($image, Mt_rand (0,230), Mt_rand (0,230), Mt_rand (0,230)); Imagechar ($image, 5, $char _x, $char _y, $char, $color _char); $char _x = $char _x + mt_rand (8,15); } $line _x1 = 0; $line _y1 = 0; $line _x2 = 0; $line _y2 = 0; for ($i =0; $i { $line _x1 = Mt_rand (0,58); $line _y1 = Mt_rand (0,22); $line _x2 = Mt_rand (0,58); $line _y2 = Mt_rand (0,22); $line _x1 = $line _x1; $line _y1 = $line _y1; $line _x2 = $line _x1 + mt_rand (1,8); $line _y2 = $line _y1 + mt_rand (1,8); $color _line = imagecolorallocate ($image, Mt_rand (0,230), Mt_rand (0,230), Mt_rand (0,230)); Imageline ($image, $line _x1, $line _y1, $line _x2, $line _y2, $color _line); } $_session[' seccode '] = $string; @header ("Expires: -1″); @header ("Cache-control:no-store, Private, post-check=0, Pre-check=0, Max-age=0″, FALSE); @header ("Pragma:no-cache"); Header (' Content-type:image/jpeg '); Imagepng ($image); Imagedestroy ($image); ?> Copy Code

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