Strict rules: Only booleans are allowed in an if condition

[lulco]

• Only booleans are allowed in an if condition, string|null given.

if ($this->getParentName()) { // <- string|null
}

should be transformed to:

if ($this->getParentName() !== null) { // ok
}

• Only booleans are allowed in an if condition, string|null given.

/** @var string|null $nullOrUrl */
if ($ʟ_if0 = $nullOrUrl) {            
}
if ($ʟ_if0) { // <- string|null
}

should be transformed to:

/** @var string|null $nullOrUrl */
if ($ʟ_if0 = $nullOrUrl) {            
}
if ($ʟ_if0 !== null) { // ok
}

• Only booleans are allowed in an if condition, Nette\Utils\Html|null given.

if ($ʟ_label = $form["username"]->getLabelPart()) {
    echo $ʟ_label;
}

should be transformed to:

$ʟ_label = $form["username"]->getLabelPart();
if ($ʟ_label !== null) {
    echo $ʟ_label;
}

• Only booleans are allowed in an if condition, Nette\Utils\Html|string|null given.

if ($ʟ_label = $form["checkbox"]->getLabel()) {
    echo $ʟ_label;
}

should be transformed to:

$ʟ_label = $form["checkbox"]->getLabel();
if ($ʟ_label !== null) {
    echo $ʟ_label;
}

• Only booleans are allowed in a ternary operator condition, int|false given.

try {
    echo 'Links:create';
} finally {
    $ʟ_tmp = \ob_get_length() ? new \Latte\Runtime\Html(\ob_get_clean()) : \ob_get_clean();
}

should be transformed to:

try {
    echo 'Links:create';
} finally {
    $ʟ_tmp = (bool)\ob_get_length() ? new \Latte\Runtime\Html(\ob_get_clean()) : \ob_get_clean();
}