php 一个通用信用卡验证类

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/**
 * 一个通用的信用卡验证php类
 *
 * @param 
 * @arrange 512-笔记网： www.512Pic.com
 **/
function CCValidationSolution ($Number) { 
	global $CardName;
	# 1) Get rid of spaces and non-numeric characters. 
	$Number = OnlyNumericSolution($Number);
	# 2) Do the first four digits fit within proper ranges? 
	#     If so, who's the card issuer and how long should the number be? 
	$NumberLeft = substr($Number, 0, 4); 
	$NumberLength = strlen($Number);
	if ($NumberLeft >= 3000 and $NumberLeft <= 3059) { 
		$CardName = "Diners Club"; 
		$ShouldLength = 14; 
	} elseif ($NumberLeft >= 3600 and $NumberLeft <= 3699) { 
		$CardName = "Diners Club"; 
		$ShouldLength = 14; 
	} elseif ($NumberLeft >= 3800 and $NumberLeft <= 3889) { 
		$CardName = "Diners Club"; 
		$ShouldLength = 14;
	} elseif ($NumberLeft >= 3400 and $NumberLeft <= 3499) { 
		$CardName = "American Express"; 
		$ShouldLength = 15; 
	} elseif ($NumberLeft >= 3700 and $NumberLeft <= 3799) { 
		$CardName = "American Express"; 
		$ShouldLength = 15;
	} elseif ($NumberLeft >= 3528 and $NumberLeft <= 3589) { 
		$CardName = "JCB"; 
		$ShouldLength = 16;
	} elseif ($NumberLeft >= 3890 and $NumberLeft <= 3899) { 
		$CardName = "Carte Blache"; 
		$ShouldLength = 14;
	} elseif ($NumberLeft >= 4000 and $NumberLeft <= 4999) { 
		$CardName = "Visa"; 
		if ($NumberLength > 14) { 
			$ShouldLength = 16; 
		} elseif ($NumberLength < 14) { 
			$ShouldLength = 13; 
		} else { 
			echo "<br /><em>The Visa number entered, $Number, in is 14 digits long.<br />Visa cards usually have 16 digits, though some have 13.<br />Please check the number and try again.</em><br />n"; 
			return FALSE; 
		}
	} elseif ($NumberLeft >= 5100 and $NumberLeft <= 5599) { 
		$CardName = "MasterCard"; 
		$ShouldLength = 16;
	} elseif ($NumberLeft == 5610) { 
		$CardName = "Australian BankCard"; 
		$ShouldLength = 16;
	} elseif ($NumberLeft == 6011) { 
		$CardName = "Discover/Novus"; 
		$ShouldLength = 16;
	} else { 
		echo "<br /><em>The first four digits of the number entered are $NumberLeft. <br />If that's correct, we don't accept that type of credit card.<br />If it's wrong, please try again.</em><br />n"; 
		return FALSE; 
	}
	# 3) Is the number the right length? 
	if ($NumberLength <> $ShouldLength) { 
		$Missing = $NumberLength - $ShouldLength; 
		if ($Missing < 0) { 
			echo "<br /><em>The $CardName number entered, $Number, is missing " . abs($Missing) . " digit(s).<br />Please check the number and try again.</em><br />n"; 
		} else { 
			echo "<br /><em>The $CardName number entered, $Number, has $Missing too many digit(s).<br />Please check the number and try again.</em><br />n"; 
		} 
		return FALSE; 
	}
	# 4) Does the number pass the Mod 10 Algorithm Checksum? 
	if (Mod10Solution($Number) == TRUE) { 
		return TRUE; 
	} else { 
		echo "<br /><em>The $CardName number entered, $Number, is invalid.<br />Please check the number and try again.</em><br />n"; 
	return FALSE; 
	} 
}
function OnlyNumericSolution ($Number) { 
   # Remove any non numeric characters. 
   # Ensure number is no more than 19 characters long. 
   return substr( ereg_replace( "[^0-9]", "", $Number) , 0, 19); 
}
function Mod10Solution ($Number) { 
	$NumberLength = strlen($Number); 
	$Checksum = 0;
	# Add even digits in even length strings 
	# or odd digits in odd length strings. 
	for ($Location = 1 - ($NumberLength % 2); $Location < $NumberLength; $Location += 2) { 
		$Checksum += substr($Number, $Location, 1); 
	}
	# Analyze odd digits in even length strings 
	# or even digits in odd length strings. 
	for ($Location = ($NumberLength % 2); $Location < $NumberLength; $Location += 2) { 
		$Digit = substr($Number, $Location, 1) * 2; 
		if ($Digit < 10) { 
			$Checksum += $Digit; 
		} else { 
			$Checksum += $Digit - 9; 
		} 
	}
	# Is the checksum divisible by ten? 
	return ($Checksum % 10 == 0); 
}
#  -----------  BEGIN SAMPLE USER INTERFACE SECTION  ------------ 
# 
# This section provides a simple sample user interface for the 
# Credit Card Validation functions.  It generates an HTML form 
# where you enter a card number to check. 
# 
	# If a number has been posted by the form, check it. 
	if ( isset($Number) ) { 
		# Get rid of spaces and non-numeric characters in posted 
		# numbers so they display correctly on the input form. 
		$Number = OnlyNumericSolution($Number);
		if (CCValidationSolution($Number) == TRUE) { 
			echo "<br />The $CardName number entered, $Number, <em>is</em> valid.<br />n"; 
		} 
	} else { 
		$Number = ""; 
	}
	# Setup an input form.  Posting it calls this page again. 
	echo "<form method="post" action="$REQUEST_URI">n"; 
	echo "<br />Credit Card Number: <input type="text" name="Number" value="$Number">n"; 
	echo "<input type="Submit" name="submitr" value="Check its Validity">n"; 
	echo "</form><br />n"; 

	
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