Buscar una cifra en una array

[Cain]

Example 1. in_array() example

$os = array ("Mac", "NT", "Irix", "Linux");
if (in_array ("Irix", $os)) {
print "Got Irix";
}
if (in_array ("mac", $os)) {
print "Got mac";
}

The second condition fails because in_array() is case-sensitive, so the program above will display:

Got Irix

Example 2. in_array() with strict example

<?php
$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, TRUE))
echo "'12.4' found with strict check\n";
if (in_array(1.13, $a, TRUE))
echo "1.13 found with strict check\n";
?>

This will display:

1.13 found with strict check

Fuente: http://www.php.net/manual/en/function.in-array.php