IsNullFunctionUsage

info off by default quick-fix

Group: Code style · PhpStorm name: IsNullFunctionUsageInspection

is_null($v) is a function call doing what the === null comparison does natively. This opt-in rule rewrites is_null() calls (including negations and comparisons of the result against true/false) into an identity comparison with null.

Example

Regular style:

Before

<?php

$a = is_null($row);
$b = !is_null($row);
$c = is_null($cfg->get()) == TRUE;
$d = false === is_null($cfg->get());
$e = is_null($row) != false;
$f = \is_null($row) !== true;
$g = $ok and is_null($row);
$h = !is_null($left ?? $right);
$i = is_null($n = next($it));
$j = is_null((int) $raw);
$k = is_null($p, $q);

After fix

<?php

$a = $row === null;
$b = $row !== null;
$c = $cfg->get() === null;
$d = $cfg->get() !== null;
$e = $row === null;
$f = $row !== null;
$g = $ok and $row === null;
$h = ($left ?? $right) !== null;
$i = ($n = next($it)) === null;
$j = (int) $raw === null;
$k = is_null($p, $q);

Reported:

• line 3: Replace with '$row === null'.
• line 4: Replace with '$row !== null'.
• line 5: Replace with '$cfg->get() === null'.
• line 6: Replace with '$cfg->get() !== null'.
• line 7: Replace with '$row === null'.
• line 8: Replace with '$row !== null'.
• line 9: Replace with '$row === null'.
• line 10: Replace with '($left ?? $right) !== null'.
• line 11: Replace with '($n = next($it)) === null'.
• line 12: Replace with '(int) $raw === null'.

Options

Option	Type	Default	Effect
(none)			Operand order follows the global comparison style (regular default / yoda).

Configure

In custos.json:

{
  "rules": {
    "IsNullFunctionUsage": {
      "enabled": true
    }
  }
}

Suppress

Before the statement or declaration (or the first statement of the file), either of:

// @custos-ignore IsNullFunctionUsage

/**
 * @noinspection IsNullFunctionUsageInspection
 */