- array_keys: documentation ( source)
<?php
$array = array(
0 => null,
1 => false,
2 => null
);
if (count(array_keys($array, null)) != count($array)) {
echo 'true';
} else {
echo 'false';
}
/*
if(array_filter($array)) {
echo "true\n";
} else echo "false\n";
$array[1] = "test";
if (array_filter($array)) {
echo "true\n";
} else echo "false\n";
*/