PHP-Parser-Sample-Simple.php

<?php

declare(strict_types=1);

require_once __DIR__ . '/../vendor/autoload.php';

use PhpParser\Error;
use PhpParser\Node;
use PhpParser\NodeTraverser;
use PhpParser\NodeVisitorAbstract;
use PhpParser\ParserFactory;

class VarDumpConvertPrintVisitor extends NodeVisitorAbstract
{
    public function leaveNode(Node $node)
    {
        if ($node instanceof Node\Expr\FuncCall && $node->name->getLast() == 'var_dump') {
            $node->name->parts = ['print'];
        }
    }
}

$code = <<<'CODE'
<?php

function test()
{
    var_dump($foo);
}
CODE;

$parser = (new ParserFactory)->create(ParserFactory::PREFER_PHP7);
try {
    $stmts = $parser->parse($code);
} catch (Error $error) {
    echo "Parse error: {$error->getMessage()}\n";
    return;
}

$traverser = new NodeTraverser;
$traverser->addVisitor(new VarDumpConvertPrintVisitor);
$stmts = $traverser->traverse($stmts);

$prettyPrinter = new PhpParser\PrettyPrinter\Standard();
$newCode = $prettyPrinter->prettyPrintFile($stmts);
var_dump($newCode);