Variable Checks¶

This pass performs syntactical variable checks:

function foo() {
    echo $a; // $a was not defined.
}

function bar($artificial) {
    if ($artifical) { // will suggest to rename to $artificial
        // do something
    }
}

It also performs a limited analysis to check that arrays have been initialized before they are written to:

function foo() {
    $a[] = 'foo'; // will suggest to add $a = array(); before
}

At the moment, this does not perform a full-blown data flow analysis, so currently it will not catch things that only may be defined, like in this example:

function foo($a) {
    if ($a || 'foo' === $b = some_function()) {
        echo $b; // $b is not always defined
    }
}