findingMethodCallNodes.php

<?php

$nodeTraverser = new PhpParser\NodeTraverser;

$nodeTraverser->addVisitor(new PhpParser\NodeVisitor\NameResolver);

$visitor = new PhpParser\NodeVisitor\FindingVisitor(function (Node $node) {
    return $node instanceof Node\Expr\MethodCall && $node->name instanceof Identifier;
});

$nodeTraverser->addVisitor($visitor);

$recursiveIteratorIterator = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator(__DIR__ . '/src'),
    RecursiveIteratorIterator::LEAVES_ONLY
);

$methodCallNodes = [];

foreach ($recursiveIteratorIterator as $file) {
    $path = $file->getPathName();
    if (!preg_match('/\.php$/', $path)) {
        continue;
    }

    $code = file_get_contents($path);
    try {
        $stmts = $parser->parse($code);
    } catch (PhpParser\Error $e) {
        echo sprintf('Parse error:%s [%s]', $e->getMessage(), $path);
        continue;
    }

    $visitor->path = $path;
    $visitor->code = $code;

    $traverser->traverse($stmts);

    $methodCallNodes = [...$methodCallNodes, ...$visitor->getFoundNodes()];
}

// do work. $methodCallNodes