Very useful PHP filtering function code to prevent SQL injection vulnerabilities

//PHP whole site anti-injection program, you need to require_once this file in the public file
//Judge the status of magic_quotes_gpc
if (@get_magic_quotes_gpc ()) {
$_GET = sec ( $_GET );
$_POST = sec ( $_POST );
$_COOKIE = sec ( $_COOKIE );
$_FILES = sec ( $_FILES );
}
$_SERVER = sec ( $_SERVER );
function sec(&$ array) {
//If it is an array, traverse the array and call recursively
if (is_array ( $array )) {
foreach ( $array as $k => $v ) {
$array [$k] = sec ( $v );
}
} else if (is_string ( $array )) {
//Use addslashes function to process
$array = addslashes ( $array );
} else if (is_numeric ( $array )) {
$ array = intval ( $array );
}
return $array;
}
//Integer filter function
function num_check($id) {
if (! $id) {
die ( 'Parameter cannot be empty!' );
} //Judgment of whether it is empty
else if (inject_check ( $id )) {
die ( 'illegal parameter' );
} // Judgment of injection
else if (! is_numetic ( $id )) {
 die ('Illegal parameter');
}
//Number judgment
$id = intval ($id);
//Integerization
return $id;
}
//Character filter function
function str_check($str ) {
if (inject_check ( $str )) {
die ( 'illegal parameter' );
}
//Injection judgment
$str = htmlspecialchars ( $str );
//Convert html
return $str;
}
function search_check($str) {
$str = str_replace ( "_", "_", $str );
//Filter out "_"
$str = str_replace ( "%", "%", $ str );
//Filter out "%"
$str = htmlspecialchars ( $str );
//Convert html
return $str;
}
//Form filter function
function post_check($str, $min, $max) {
if (isset ( $min ) && strlen ( $str ) < $min) {
die ( 'minimum $min bytes' );
} else if (isset ( $max ) && strlen ( $ str ) > $max) {
die ( 'Up to $max bytes' );
}
return stripslashes_array ( $str );
}
//Anti-injection function
function inject_check($sql_str) {
return eregi ( 'select|inert|update|delete|'|/*|*|../|./|UNION|into|load_file|outfile', $sql_str );
// Filter and prevent injection
}
function stripslashes_array( &$array) {
if (is_array ( $array )) {
foreach ( $array as $k => $v ) {
$array [$k] = stripslashes_array ( $v );
}
} else if (is_string ( $array )) {
$array = stripslashes ( $array );
}
return $array;
}
?>