Mavzu: phpda Captcha generatsiya qilish usullari

Endi esa kodni to’liq yozamiz. 1 . index.php faylini yarating Avvalo men indeks faylini yarataman, bu faylda captcha html shaklini yarataman. Shuningdek, men sahifani yangilamasdan captcha-ni yangilaydigan javascriptni qo'shaman. Captcha formasini topshirgandan so'ng kiritilgan captcha kodi yaratilgan captcha kodi bilan tasdiqlanadi. Agar ikkalasi ham bir xil bo'lsa, foydalanuvchi muvaffaqiyatga oid xabarni ko'radi, aks holda muvaffaqiyatsizlikka uchraydi. Endi index.php sahifasini yarating va quyidagi HTML captcha shaklini nusxa ko'chiring. Html name="form" method="post" action=""> Enter Captcha:
type="text" name="captcha" />
src="captcha.php?rand=" id='captcha_image'>

Can't read the image? href='javascript: refreshCaptcha();'>click here to refresh
type="submit" name="submit" value="Submit">

JavaScript Yuqoridagi javascriptni index.php altbilgisiga qo'shing. Ushbu skript, agar o'qish juda qiyin bo'lsa, captcha-ni yangilaydi, shunda foydalanuvchi yangi captcha kodini qo'shishi mumkin. PHP-skript yorlig'ini boshlashdan oldin index.php faylining sarlavhasiga quyidagi PHP tekshirish skriptini kiriting .

Quyidagi skript captcha kodini foydalanuvchilar kiritgan ma'lumotlarga mos keladi va muvaffaqiyatsizlik yoki muvaffaqiyatsizlik to'g'risida xabar beradi. if ( isset($_POST['captcha']) && ($_POST['captcha']!="") ){ // Validation: Checking entered captcha code with the generated captcha code if(strcasecmp($_SESSION['captcha'], $_POST['captcha']) != 0){ // Note: the captcha code is compared case insensitively. // if you want case sensitive match, check above with strcmp() $status = "
Entered captcha code does not match! Kindly try again.
"; }else{ $status = "
Your captcha code is match.
"; } } echo $status; ?>