PHP SQL anti-injection code

<?php Tutorial
Illegal characters to filter
$ArrFiltrate =array ("'", ";", "union");
The URL to jump after an error is not filled in the default previous page
$STRGOURL = "";
Whether the value in the array exists
function Funstringexist ($StrFiltrate, $ArrFiltrate) {
foreach ($ArrFiltrate as $key => $value) {
if (eregi ($value, $StrFiltrate)) {
return true;
}
}
return false;
}
Merging $_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 []= $value;
}
}
Verify Start
foreach ($ArrPostAndGet as $key => $value) {
if (Funstringexist ($value, $ArrFiltrate)) {
echo "<script language=" JavaScript tutorial >alert ("illegal character");</script> ";
if (Emptyempty ($STRGOURL)) {
echo "<script language=" JavaScript ">history.go ( -1);</script>";
}else{
echo "<script language=" JavaScript ">window.location=" ". $StrGoUrl." "; </script> ";
}
Exit
}
}
?>