SoFunction
Updated on 2025-04-08

PHP general detection function collection

<? 
// 【File Name】: c_check.inc
//【Function】: General detection function set
//【Author】: The sky is gray
//【Last modified date】: 2001/05/11[cxx]
//【Variable definition rules】: ‘C_'=character type, ‘I_'=integer type, ‘N_'=numeric type, ‘L_'=boolean type, ‘A_'=array type

//-------------------------------------------------- 
// ※CheckMoney($C_Money) Check whether the data is in the 9999.99 format
// ※CheckEmailAddr($C_mailaddr) Judge whether it is a valid email address
// ※CheckWebAddr($C_weburl) Judging whether it is a valid URL
// ※CheckEmpty($C_char) Judges whether the string is empty
// ※CheckLengthBetween($C_char,$I_len1,$I_len2=100) Determine whether it is a string within the specified length
// ※CheckUser($C_user) determines whether it is a legal user name
// ※CheckPassword($C_passwd) determines whether it is a legal user password
// ※CheckTelephone($C_telephone) Judge whether it is a legal phone number
// ※CheckValueBetween($N_var,$N_val1,$N_val2) determines whether it is a legal value within a certain range.
// ※CheckPost($C_post) Judge whether it is a legal postal code (fixed length)
// ※CheckExtendName($C_filename,$A_extend) Judges the extension of the uploaded file
// ※CheckImageSize($ImageFileName,$LimitSize) Check the size of the uploaded image
// ※AlertExit($C_alert,$I_goback=0) Illegal operation warning and exit
// ※Alert($C_alert,$I_goback=0) Illegal operation warning
// ※ReplaceSpacialChar($C_char) Special character replacement function
// ※ExchangeMoney($N_money) Fund conversion function
// ※WindowLocation($C_url,$C_get="",$C_getOther="") Functions in PHP
//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckMoney($C_Money)
// Function: Check whether the data is in the 9999.99 format
// Parameter: $C_Money (number to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckMoney($C_Money) 

if (!ereg("^[0-9][.][0-9]$", $C_Money)) return false; 
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckEmailAddr($C_mailaddr)
// Function: determine whether it is a valid email address
// Parameter: $C_mailaddr (email address to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckEmailAddr($C_mailaddr) 

if (!eregi("^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*$", 
$C_mailaddr)) 
//(!ereg("^[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*@[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$", 
$c_mailaddr)) 

return false; 

return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckWebAddr($C_weburl)
// Function: determine whether it is a valid URL
// Parameter: $C_weburl (url to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckWebAddr($C_weburl) 

if (!ereg("^http://[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$", $C_weburl)) 

return false; 

return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckEmpty($C_char)
// Function: determine whether the string is empty
// Parameter: $C_char (char string to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckEmptyString($C_char) 

if (!is_string($C_char)) return false; //Is it a string type
if (empty($C_char)) return false; //Is it set
if ($C_char=='') return false; //Is it empty
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckLengthBetween($C_char, $I_len1, $I_len2=100)
// Function: determine whether it is a string within the specified length.
// Parameter: $C_char (char string to be detected)
//$I_len1  (lower limit of the length of the target string)
//$I_len2 (upper limit of the length of the target string)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckLengthBetween($C_cahr, $I_len1, $I_len2=100) 

$C_cahr = trim($C_cahr); 
if (strlen($C_cahr) < $I_len1) return false; 
if (strlen($C_cahr) > $I_len2) return false; 
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckUser($C_user)
// Function: determine whether it is a legal username
// Parameter: $C_user (user name to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckUser($C_user) 

if (!CheckLengthBetween($C_user, 4, 20)) return false; //Width check
if (!ereg("^[_a-zA-Z0-9]*$", $C_user)) return false; //Special character check
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckPassword($C_passwd)
// Function: determine whether it is a legal user password
// Parameter: $C_passwd (password to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckPassword($C_passwd) 

if (!CheckLengthBetween($C_passwd, 4, 20)) return false; //Width detection
if (!ereg("^[_a-zA-Z0-9]*$", $C_passwd)) return false; //Special character detection
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckTelephone($C_telephone)
// Function: determine whether it is a legal phone number
// Parameter: $C_telephone (phone number to be detected)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckTelephone($C_telephone) 

if (!ereg("^[+]?[0-9]+([xX-][0-9]+)*$", $C_telephone)) return false; 
return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckValueBetween($N_var, $N_val1, $N_val2)
// Function: determine whether it is a legal value within a certain range.
// Parameter: $N_var Value to be detected
// $N_var1 Upper limit of the value to be detected
// $N_var2 The lower limit of the value to be detected
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckValueBetween($N_var, $N_val1, $N_val2) 

if ($N_var < $N_var1 ││ $N_var > $N_var2) 

return false; 

return true; 


//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckPost($C_post)
// Function: determine whether it is a legal postal code (fixed length)
// Parameter: $C_post (zip code to be checked)
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckPost($C_post) 

$C_post=trim($C_post); 
if (strlen($C_post) == 6) 

if(!ereg("^[+]?[_0-9]*$",$C_post)) 

return true;; 
}else 

return false; 

}else 

return false;; 


//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckExtendName($C_filename,$A_extend)
// Function: judgment of the extension of uploaded file
// Parameter: $C_filename Uploaded file name
// $A_extend Required extension
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckExtendName($C_filename,$A_extend) 

if(strlen(trim($C_filename)) < 5) 

return 0; //Return 0 means that the picture was not uploaded.

$lastdot = strrpos($C_filename, "."); //Take it out. The last location
$extended = substr($C_filename, $lastdot+1); //Take out the extension

for($i=0;$i<count($A_extend);$i++)//Check

if (trim(strtolower($extended)) == trim(strtolower($A_extend[$i]))) //Convert large
Lowercase and detection

$flag=1; //Add success flag
$i=count($A_extend); //Stop detection when detected



if($flag<>1) 

for($j=0;$j<count($A_extend);$j++) // List the types of extensions that are allowed to be uploaded

$alarm .= $A_extend[$j]." "; 

AlertExit('Only upload '.$alarm.' files! And what you upload is a file of type '.$extended.');
return -1; //Return-1 means that the type of uploaded image does not match.


return 1; //Return 1 means that the type of the picture meets the requirements

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: CheckImageSize($ImageFileName,$LimitSize)
// Function: Check the size of uploaded pictures
// Parameter: $ImageFileName Uploaded image name
// $LimitSize Required Size
// Return value: Boolean value
// Note: None
//-------------------------------------------------- 
function CheckImageSize($ImageFileName,$LimitSize) 

$size=GetImageSize($ImageFileName); 
if ($size[0]>$LimitSize[0] || $size[1]>$LimitSize[1]) 

AlertExit('The image is too large');
return false; 

return true; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: Alert($C_alert,$I_goback=0)
// Function: Illegal operation warning
// Parameter: $C_alert (Error message prompted)
//$I_goback (return to that page)
// Return value: string
// Note: None
//-------------------------------------------------- 
function Alert($C_alert,$I_goback=0) 

if($I_goback<>0) 

echo "<script>alert('$C_alert');($I_goback);</script>"; 

else 

echo "<script>alert('$C_alert');</script>"; 


//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: AlertExit($C_alert,$I_goback=0)
// Function: Illegal operation warning
// Parameter: $C_alert (Error message prompted)
//$I_goback (return to that page)
// Return value: string
// Note: None
//-------------------------------------------------- 
function AlertExit($C_alert,$I_goback=0) 

if($I_goback<>0) 

echo "<script>alert('$C_alert');($I_goback);</script>"; 
exit; 

else 

echo "<script>alert('$C_alert');</script>"; 
exit; 


//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: ReplaceSpacialChar($C_char)
// Function: Special character replacement function
// Parameter: $C_char (string to be replaced)
// Return value: string
// Note: None
//-------------------------------------------------- 
function ReplaceSpecialChar($C_char) 

$C_char=HTMLSpecialChars($C_char); //Convert special characters to HTML format.
$C_char=nl2br($C_char); //Replace Enter with<br>
$C_char=str_replace(" "," ",$C_char); //Replace space with
$C_char=str_replace("<? ","< ?",$C_char); //Replace PHP tag
return $C_char; 

//-------------------------------------------------- 

//-------------------------------------------------- 
// Function name: ExchangeMoney($N_money)
// Function: Fund conversion function
// Parameter: $N_money (the amount to be converted)
// Return value: string
// Note: Example of this function: $char=ExchangeMoney(5645132.3155) ==> $char='¥5,645,132.31'
//-------------------------------------------------- 
function ExchangeMoney($N_money) 

$A_tmp=explode(".",$N_money ); //Divide the number into two parts by the decimal point and save it into the array $A_tmp
$I_len=strlen($A_tmp[0]); //Measure the width of the number of digits before the decimal point

if($I_len%3==0) 

$I_step=$I_len/3; //If the width of the previous digits mod 3 = 0, you can press it and divide it into $I_step
part
}else 

$step=($len-$len%3)/3+1; //If the width of the previous digits mod 3 != 0, you can press it and divide it into $I_step
Part +1


$C_cur=""; 
//Convert the amount before the decimal point
while($I_len<>0) 

$I_step--; 

if($I_step==0) 

$C_cur .= substr($A_tmp[0],0,$I_len-($I_step)*3); 
}else 

$C_cur .= substr($A_tmp[0],0,$I_len-($I_step)*3).","; 


$A_tmp[0]=substr($A_tmp[0],$I_len-($I_step)*3); 
$I_len=strlen($A_tmp[0]); 


//Convert the amount after the decimal point
if($A_tmp[1]=="") 

$C_cur .= ".00"; 
}else 

$I_len=strlen($A_tmp[1]); 
if($I_len<2) 

$C_cur .= ".".$A_tmp[1]."0"; 
}else 

$C_cur .= ".".substr($A_tmp[1],0,2); 



//Add RMB symbol and send it out
$C_cur="¥".$C_cur; 
return $C_cur; 

//-------------------------------------------------- 

//------------------------------------------------- 
// Function name: WindowLocation($C_url,$C_get="",$C_getOther="")
// Function: Functions in PHP
// Parameter: $C_url The URL of the turn window
//$C_get GET method parameters
// Other parameters of the $C_getOther GET method
// Return value: String
// Note: None
//------------------------------------------------ 
function WindowLocation($C_url,$C_get="",$C_getOther="") 

if($C_get == "" && $C_getOther == "") 
if($C_get == "" && $C_getOther <> ""){$C_target=""='$C_url? 
$C_getOther='+"";} 
if($C_get <> "" && $C_getOther == ""){$C_target=""='$C_url? 
$C_get'"";} 
if($C_get <> "" && $C_getOther <> ""){$C_target=""='$C_url? 
$C_get&$C_getOther='+"";} 
return $C_target; 

//------------------------------------------------ 
?>