PHP 배열 함수 in_array()는 지정된 값이 배열에 존재하는지 여부를 찾습니다.

$people = array("Peter", "Joe", "Glenn", "Cleveland");
if (in_array("Glenn",$people))
{
echo "Match found";
}
else
{
echo "Match not found";
}
?>

输出： Match found

例2：

$people = array("Peter", "Joe", "Glenn", "Cleveland", 23);
if (in_array("23",$people, TRUE))
{
echo "Match found";
}
else
{
echo "Match not found";
}if (in_array("Glenn",$people, TRUE))
{
echo "Match found";
}
else
{
echo "Match not found";
}if (in_array(23,$people, TRUE))
{
echo "Match found";
}
else
{
echo "Match not found";
}
?>

输出： Match not found Match found Match found