php: check if variable contains a value

• PHP

The value 0 is also considered empty - although there is definitely a value here.

If you want to prevent this, you must also query for false === is_numeric - this excludes 0.

So here we do not check for emptiness, but for value
which makes false === hasValue() equivalent in the same meaning to true === empty(),
but considers 0 value and boolean values as well.

Everything is a value, except null and empty string.

function hasValue()

/**
 * @param mixed $mValue
 * @return bool
 */
function hasValue(mixed $mValue): bool
{
    return ((false === (true === empty($mValue) && false === is_numeric($mValue))) || is_bool($mValue));
}

Test

$aData = array(
    new StdClass(),
    '',
    0,
    '0',
    'test',
    123,
    null,
    false,
    true
);

// iterate and test
foreach ($aData as $mValue)
{
    echo str_repeat('-', 80) . "\n";
    echo var_export($mValue, true) . "\n";
    echo 'hasValue: ';
    var_dump(
        hasValue($mValue)
    );
    echo "\n";
}

Result

--------------------------------------------------------------------------------
(object) array(
)
hasValue: bool(true)

--------------------------------------------------------------------------------
''
hasValue: bool(false)

--------------------------------------------------------------------------------
0
hasValue: bool(true)

--------------------------------------------------------------------------------
'0'
hasValue: bool(true)

--------------------------------------------------------------------------------
'test'
hasValue: bool(true)

--------------------------------------------------------------------------------
123
hasValue: bool(true)

--------------------------------------------------------------------------------
NULL
hasValue: bool(false)

--------------------------------------------------------------------------------
false
hasValue: bool(true)

--------------------------------------------------------------------------------
true
hasValue: bool(true)