Question

if i’ve input text where visitor should enter own URL

<form name="frm" method="post" action="addlink.php">
url : <input type="text" name="url" id="url">
<button type="submit" class="options green">add</button>
</form>

and addlink.php code like this

$url = $_POST['url']; 
$sql = "INSERT INTO $table_urls (url) VALUES ('$url')";
mysql_query($sql, $conn) or die(mysql_error());

i want to ban for example http://www.something.com/anything so if the visitor enter any url has http://www.something.com/else – http://www.something.com/elsething ..etc

it detect something.com and gives error like

<?PHP if(XXXXXXXX){
echo "somthing.com is not allowed";
}else{
$sql = "INSERT INTO $table_urls (url) VALUES ('$url')";
mysql_query($sql, $conn) or die(mysql_error());
}

if what ! i wanna say if $url has any something.com then give not allowed !

Answer 1

You can use PHP’s function, preg_match() to find the exact match:

if (preg_match('/something.com/i', $url) > 0) {
    // Your error message here
}

For more information on using that function, you can check here: http://php.net/manual/en/function.preg-match.php