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<?php
$sites = array("Google", "tutorialpro", "Taobao", "Facebook");

if (in_array("tutorialpro", $sites))
{
    echo "Match found!";
}
else
{
    echo "No match found!";
}
?>

bool in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] )

<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland", 23);

if (in_array("23", $people, TRUE))
{
    echo "Match found<br>";
}
else
{
    echo "Match not found<br>";
} 
if (in_array("Glenn",$people, TRUE))
{
    echo "Match found<br>";
}
else
{
    echo "Match not found<br>";
}

if (in_array(23,$people, TRUE))
{
    echo "Match found<br>";
}
else
{
    echo "Match not found<br>";
}
?>