Php anti-injection _ PHP Tutorial

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/*************************
Note:
Determines whether the passed variable contains invalid characters.
Such as $ _ POST and $ _ GET
Function:
Anti-injection
**************************/

// Invalid characters to be filtered
$ ArrFiltrate = array ("'''", ";", "union ");
// The url to be redirected after an error occurs. If this parameter is left blank, the previous page is displayed by default.
$ StrGoUrl = "";
// Whether the value in the array exists
Function FunStringExist ($ StrFiltrate, $ ArrFiltrate ){
Foreach ($ ArrFiltrate as $ key => $ value ){
If (eregi ($ value, $ StrFiltrate )){
Return true;
}
}
Return false;
}

// Merge $ _ POST and $ _ GET
If (function_exists (array_merge )){
$ ArrPostAndGet = array_merge ($ HTTP_POST_VARS, $ HTTP_GET_VARS );
} Else {
Foreach ($ HTTP_POST_VARS as $ key => $ value ){
$ ArrPostAndGet [] = $ value;
}
Foreach ($ HTTP_GET_VARS as $ key => $ value ){
$ ArrPostAndGet [] = $ value;
}
}

// Verification starts
Foreach ($ ArrPostAndGet as $ key => $ value ){
If (FunStringExist ($ value, $ ArrFiltrate )){
Echo"