PHP Write login Verification code function with call method, PHP verification Code _php Tutorial

PHP Write login Verification code function with call method, PHP verification code

The example of this article for everyone to share a PHP write login verification code function, for your reference, the specific content as follows

showkey.php

<?phpsession_start ();//Set Cookie or Sessionfunction Esetcookie ($name, $str, $life =0) {//This function will string str All lowercase strings make the captcha input case-insensitive----the same need to convert $_session[$name]=strtolower ($STR) in submitting a form for session comparison Get random characters This function is case-sensitive if case-insensitive can be added to the function strtolowerfunction Domake_password ($len) {$chars = array (/* "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", */"0", "1", "2", "3", "4", "5", "6", "7", "8", "9");   $charsLen = count ($chars)-1;   Shuffle ($chars);//The array is scrambled $output = ""; for ($i =0; $i < $len; $i + +) {$output. = $chars [Mt_rand (0, $charsLen)];//Get an array element} return $output;} Show Captcha function ShowKey () {$key =domake_password (4);//Get random values $set =esetcookie ("Checkkey", $key);// Writes a random value to a cookie or session//whether the GD library if (function_exists ("imagejpeg")) {header ("CONTENT-TYPE:IMAGE/JPE") is supportedG ");  $img =imagecreate (47,20);  $blue =imagecolorallocate ($img, 102,102,102);  $white =imagecolorallocate ($img, 255,255,255);  $black =imagecolorallocate ($img, 71,71,71);  Imagefill ($img, 0,0, $blue);  Imagestring ($img, 5,6,3, $key, $white);  for ($i =0; $i <90; $i + +)//Add interfering pixel {imagesetpixel ($img, Rand ()%70,rand ()%30, $black);  } imagejpeg ($IMG); Imagedestroy ($IMG);  } elseif (Function_exists ("Imagepng")) {header ("content-type:image/png");  $img =imagecreate (47,20);  $blue =imagecolorallocate ($img, 102,102,102);  $white =imagecolorallocate ($img, 255,255,255);  $black =imagecolorallocate ($img, 71,71,71);  Imagefill ($img, 0,0, $blue);  Imagestring ($img, 5,6,3, $key, $white);  for ($i =0; $i <90; $i + +)//Add interfering pixel {imagesetpixel ($img, Rand ()%70,rand ()%30, $black);  } imagepng ($IMG); Imagedestroy ($IMG);  } elseif (Function_exists ("Imagegif")) {header ("content-type:image/gif");  $img =imagecreate (47,20);  $blue =imagecolorallocate ($img, 102,102,102);  $white =imagecolorallocate ($img, 255,255,255); $black =imageColorallocate ($img, 71,71,71);  Imagefill ($img, 0,0, $blue);  Imagestring ($img, 5,6,3, $key, $white);  for ($i =0; $i <90; $i + +)//Add interfering pixel {imagesetpixel ($img, Rand ()%70,rand ()%30, $black);  } imagegif ($IMG); Imagedestroy ($IMG);  } elseif (Function_exists ("Imagewbmp")) {header ("content-type:image/vnd.wap.wbmp");  $img =imagecreate (47,20);  $blue =imagecolorallocate ($img, 102,102,102);  $white =imagecolorallocate ($img, 255,255,255);  $black =imagecolorallocate ($img, 71,71,71);  Imagefill ($img, 0,0, $blue);  Imagestring ($img, 5,6,3, $key, $white);  for ($i =0; $i <90; $i + +)//Add interfering pixel {imagesetpixel ($img, Rand ()%70,rand ()%30, $black);  } imagewbmp ($IMG); Imagedestroy ($IMG);  } else {//does not support verification code header ("content-type:image/jpeg\r\n");  Header ("pragma:no-cache\r\n");  Header ("cache-control:no-cache\r\n");  Header ("expires:0\r\n");  $fp = fopen ("Data/vdcode.jpg", "R"); }}showkey ();? >

Call Method:

Copy the Code code as follows:

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