Html e PHP - SMsoft - informatica e dintorni

Codice per validare le carte di credito

29 Aprile 2009di admin

Riporto di seguito un script php, reperito dal sito sastgroup, utile per validare le carte di credito:

< ?

if( checkCreditCard ("40236007878787", "Visa", &$errornumber, &$errortext))
echo "OK";
else echo"MO";

function checkCreditCard ($cardnumber, $cardname, &$errornumber, &$errortext) {

$cards = array ( array ('name' => 'American Express',
'length' => '15',
'prefixes' => '34,37',
'checkdigit' => true
),
array ('name' => 'Carte Blanche',
'length' => '14',
'prefixes' => '300,301,302,303,304,305,36,38',
'checkdigit' => true
),
array ('name' => 'Diners Club',
'length' => '14',
'prefixes' => '300,301,302,303,304,305,36,38',
'checkdigit' => true
),
array ('name' => 'Discover',
'length' => '16',
'prefixes' => '6011',
'checkdigit' => true
),
array ('name' => 'Enroute',
'length' => '15',
'prefixes' => '2014,2149',
'checkdigit' => true
),
array ('name' => 'JCB',
'length' => '15,16',
'prefixes' => '3,1800,2131',
'checkdigit' => true
),
array ('name' => 'Maestro',
'length' => '16,18',
'prefixes' => '5020,6',
'checkdigit' => true
),
array ('name' => 'MasterCard',
'length' => '16',
'prefixes' => '51,52,53,54,55',
'checkdigit' => true
),
array ('name' => 'Solo',
'length' => '16,18,19',
'prefixes' => '6334,6767',
'checkdigit' => true
),
array ('name' => 'Switch',
'length' => '16,18,19',
'prefixes' => '4903,4905,4911,4936,564182,633110,6333,6759',
'checkdigit' => true
),
array ('name' => 'Visa',
'length' => '13,16',
'prefixes' => '4',
'checkdigit' => true
),
array ('name' => 'Visa Electron',
'length' => '16',
'prefixes' => '417500,4917,4913',
'checkdigit' => true
)
);

$ccErrorNo = 0;

$ccErrors [0] = "Unknown card type";
$ccErrors [1] = "No card number provided";
$ccErrors [2] = "Credit card number has invalid format";
$ccErrors [3] = "Credit card number is invalid";
$ccErrors [4] = "Credit card number is wrong length";

// Establish card type
$cardType = -1;
for ($i=0; $i

// See if it is this card (ignoring the case of the string)
if (strtolower($cardname) == strtolower($cards[$i]['name'])) {
$cardType = $i;
break;
}
}

// If card type not found, report an error
if ($cardType == -1) {
$errornumber = 0;
$errortext = $ccErrors [$errornumber];
return false;
}

// Ensure that the user has provided a credit card number
if (strlen($cardnumber) == 0) {
$errornumber = 1;
$errortext = $ccErrors [$errornumber];
return false;
}

// Remove any spaces from the credit card number
$cardNo = str_replace (' ', '', $cardnumber);

// Check that the number is numeric and of the right sort of length.
if (!eregi('^[0-9]{13,19}$',$cardNo)) {
$errornumber = 2;
$errortext = $ccErrors [$errornumber];
return false;
}

// Now check the modulus 10 check digit - if required
if ($cards[$cardType]['checkdigit']) {
$checksum = 0; // running checksum total
$mychar = ""; // next char to process
$j = 1; // takes value of 1 or 2

// Process each digit one by one starting at the right
for ($i = strlen($cardNo) - 1; $i >= 0; $i--) {

// Extract the next digit and multiply by 1 or 2 on alternative digits.
$calc = $cardNo{$i} * $j;

// If the result is in two digits add 1 to the checksum total
if ($calc > 9) {
$checksum = $checksum + 1;
$calc = $calc - 10;
}

// Add the units element to the checksum total
$checksum = $checksum + $calc;

// Switch the value of j
if ($j ==1) {$j = 2;} else {$j = 1;};
}

// All done - if checksum is divisible by 10, it is a valid modulus 10.
// If not, report an error.
if ($checksum % 10 != 0) {
$errornumber = 3;
$errortext = $ccErrors [$errornumber];
return false;
}
}

// The following are the card-specific checks we undertake.

// Load an array with the valid prefixes for this card
$prefix = split(',',$cards[$cardType]['prefixes']);

// Now see if any of them match what we have in the card number
$PrefixValid = false;
for ($i=0; $i
$exp = '^' . $prefix[$i];
if (ereg($exp,$cardNo)) {
$PrefixValid = true;
break;
}
}

// If it isn't a valid prefix there's no point at looking at the length
if (!$PrefixValid) {
$errornumber = 3;
$errortext = $ccErrors [$errornumber];
return false;
}

// See if the length is valid for this card
$LengthValid = false;
$lengths = split(',',$cards[$cardType]['length']);
for ($j=0; $j
if (strlen($cardNo) == $lengths[$j]) {
$LengthValid = true;
break;
}
}

// See if all is OK by seeing if the length was valid.
if (!$LengthValid) {
$errornumber = 4;
$errortext = $ccErrors [$errornumber];
return false;
};

// The credit card is in the required format.
return true;
}
?>

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if(checkCreditCard("40236007878787","Visa",&$errornumber,&$errortext))

echo"OK";

elseecho"MO";

functioncheckCreditCard($cardnumber,$cardname,&$errornumber,&$errortext){

$cards=array(array('name'=>'American Express',

'length'=>'15',

'prefixes'=>'34,37',

'checkdigit'=>true

array('name'=>'Carte Blanche',

'length'=>'14',

'prefixes'=>'300,301,302,303,304,305,36,38',

'checkdigit'=>true

array('name'=>'Diners Club',

'length'=>'14',

'prefixes'=>'300,301,302,303,304,305,36,38',

'checkdigit'=>true

array('name'=>'Discover',

'length'=>'16',

'prefixes'=>'6011',

'checkdigit'=>true

array('name'=>'Enroute',

'length'=>'15',

'prefixes'=>'2014,2149',

'checkdigit'=>true

array('name'=>'JCB',

'length'=>'15,16',

'prefixes'=>'3,1800,2131',

'checkdigit'=>true

array('name'=>'Maestro',

'length'=>'16,18',

'prefixes'=>'5020,6',

'checkdigit'=>true

array('name'=>'MasterCard',

'length'=>'16',

'prefixes'=>'51,52,53,54,55',

'checkdigit'=>true

array('name'=>'Solo',

'length'=>'16,18,19',

'prefixes'=>'6334,6767',

'checkdigit'=>true

array('name'=>'Switch',

'length'=>'16,18,19',

'prefixes'=>'4903,4905,4911,4936,564182,633110,6333,6759',

'checkdigit'=>true

array('name'=>'Visa',

'length'=>'13,16',

'prefixes'=>'4',

'checkdigit'=>true

array('name'=>'Visa Electron',

'length'=>'16',

'prefixes'=>'417500,4917,4913',

'checkdigit'=>true

)

);

$ccErrorNo=0;

$ccErrors[0]="Unknown card type";

$ccErrors[1]="No card number provided";

$ccErrors[2]="Credit card number has invalid format";

$ccErrors[3]="Credit card number is invalid";

$ccErrors[4]="Credit card number is wrong length";

// Establish card type

$cardType=-1;

for($i=0;$i

// See if it is this card (ignoring the case of the string)

if(strtolower($cardname)==strtolower($cards[$i]['name'])){

$cardType=$i;

break;

}

// If card type not found, report an error

if($cardType==-1){

$errornumber=0;

$errortext=$ccErrors[$errornumber];

returnfalse;

}

// Ensure that the user has provided a credit card number

if(strlen($cardnumber)==0){

$errornumber=1;

$errortext=$ccErrors[$errornumber];

returnfalse;

}

// Remove any spaces from the credit card number

$cardNo=str_replace(' ','',$cardnumber);

// Check that the number is numeric and of the right sort of length.

if(!eregi('^[0-9]{13,19}$',$cardNo)){

$errornumber=2;

$errortext=$ccErrors[$errornumber];

returnfalse;

}

// Now check the modulus 10 check digit - if required

if($cards[$cardType]['checkdigit']){

$checksum=0;// running checksum total

$mychar="";// next char to process

$j=1;// takes value of 1 or 2

// Process each digit one by one starting at the right

for($i=strlen($cardNo)-1;$i>=0;$i--){

// Extract the next digit and multiply by 1 or 2 on alternative digits.

$calc=$cardNo{$i}*$j;

// If the result is in two digits add 1 to the checksum total

if($calc>9){

$checksum=$checksum+1;

$calc=$calc-10;

}

// Add the units element to the checksum total

$checksum=$checksum+$calc;

// Switch the value of j

if($j==1){$j=2;}else{$j=1;};

}

// All done - if checksum is divisible by 10, it is a valid modulus 10.

// If not, report an error.

if($checksum%10!=0){

$errornumber=3;

$errortext=$ccErrors[$errornumber];

returnfalse;

}

// The following are the card-specific checks we undertake.

// Load an array with the valid prefixes for this card

$prefix=split(',',$cards[$cardType]['prefixes']);

// Now see if any of them match what we have in the card number

$PrefixValid=false;

for($i=0;$i

$exp='^'.$prefix[$i];

if(ereg($exp,$cardNo)){

$PrefixValid=true;

break;

}

// If it isn't a valid prefix there's no point at looking at the length

if(!$PrefixValid){

$errornumber=3;

$errortext=$ccErrors[$errornumber];

returnfalse;

}

// See if the length is valid for this card

$LengthValid=false;

$lengths=split(',',$cards[$cardType]['length']);

for($j=0;$j

if(strlen($cardNo)==$lengths[$j]){

$LengthValid=true;

break;

}

// See if all is OK by seeing if the length was valid.

if(!$LengthValid){

$errornumber=4;

$errortext=$ccErrors[$errornumber];

returnfalse;

};

// The credit card is in the required format.

returntrue;

}

Gestione Crossbrowser semplificata

28 Novembre 2008di admin

Oggi voglio pubblicare una cosa che differisce dagli argomenti degli altri post, ma dato che l’html è comunque legato in qualche modo al mio mondo, volevo scrivere due righe su come bypassare un annoso problema di compatibilità di visualizzazione tra i browser. Immaginiamo di aver definito uno stile CSS come segue:

#search_box {
  float: right;
  clear: right;
  width: 200px;
}

#search_box {

float:right;

clear:right;

width:200px;

}

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