PHP verification code implementation code _ PHP Tutorial

PHP verification code. The checkcode. php generates the verification code image and the variable $ _ SESSION [check_pic]. Copy the code as follows :? Session_start (); for ($ i0; $ i4; $ I ++) {$ rand. dechex (rand (1, 15);} $ _ SESSIO checkcode. php generates a verification code image with the variable $ _ SESSION [check_pic].

The code is as follows:

Session_start ();
For ($ I = 0; $ I <4; $ I ++ ){
$ Rand. = dechex (rand (1, 15 ));
}
$ _ SESSION [check_pic] = $ rand;
// Echo $ _ SESSION [check_pic];
// Set the image size
$ Im = imagecreatetruecolor (100,30 );
// Set the color
$ Bg = imagecolorallocate ($ im, 0, 0 );
$ Te = imagecolorallocate ($ im, 255,255,255 );
// Write the string in the upper left corner of the image
Imagestring ($ im, rand (5, 6), rand (25, 30), 5, $ rand, $ te );
// Output image
Header ("Content-type: image/jpeg ");
Imagejpeg ($ im );
?>

Form. php
Verification code image generated by calling

The code is as follows:

Message

Imagestring ($ im, rand (5, 6), rand (25, 30), 5, $ rand, $ te); int imagestring (int im, int font, int x, int y, string s, int col); function, which is used to draw a horizontal string.
This function draws horizontal strings on the image. The font parameter is a font. if it is set to 1 to 5, the default font is used. The x and y parameters are the starting coordinates of the string. The content of the string is placed on parameter s. The col parameter indicates the color of the string.
Post. php
Compare $ _ POST [check] and $ _ SESSION [check_pic]. if they are the same, insert the database. If they are not equal, the previous page is returned.

The code is as follows:

Session_start ();
If (isset ($ _ POST [check])
{
If ($ _ POST [check] === _ SESSION [check_pic])
{
// Echo "the verification code is correct". $ _ SESSION [check_pic];
Require ("dbinfo. php ");
$ Name = $ _ POST ['name'];
$ Email = $ _ POST ['email '];
$ Website = $ _ POST ['Website'];
$ Content = $ _ POST ['content'];
$ Date = date ("Y-m-d h: m: s ");
// Connect to the MySQL server
$ Connection = mysql_connect ($ host, $ username, $ password );
If (! $ Connection)
{
Die ('not connected: '. mysql_error ());
}
// Set the active MySQL database
$ Db_selected = mysql_select_db ($ database, $ connection );
If (! $ Db_selected)
{
Die ('Can \'t use db: '. mysql_error ());
}
// Insert data into the database
$ Query = "insert into table (nowamagic_name, nowamagic_email, region, nowamagic_content, nowamagic_date) values ('$ name',' $ email ',' $ website ',' $ content ', '$ date ')";
$ Result = mysql_query ($ query );
If ($ result)
{
Echo "script" alert ('submitted successfully'); history. go (-1); script ";
}
If (! $ Result)
{
Die ('invalid query: '. mysql_error ());
}
}
Else
{
Echo "script" alert ('verification code error'); history. go (-1); script ";
}
}
?>

The http://www.bkjia.com/PHPjc/323975.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/323975.htmlTechArticlecheckcode.php generates a verification code image with the variable $ _ SESSION [check_pic]. The code is as follows :? Session_start (); for ($ I = 0; $ i4; $ I ++) {$ rand. = dechex (rand ();} $ _ SESSIO...