PHP-Parser-Sample-Preserving.php

<?php

declare(strict_types=1);

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

use PhpParser\Error;
use PhpParser\Lexer;
use PhpParser\Node;
use PhpParser\NodeTraverser;
use PhpParser\NodeVisitorAbstract;
use PhpParser\NodeVisitor;
use PhpParser\Parser;
use PhpParser\PrettyPrinter;

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;

$lexer = new Lexer\Emulative([
    'usedAttributes' => [
        'comments',
        'startLine', 'endLine',
        'startTokenPos', 'endTokenPos',
    ],
]);
$parser = new Parser\Php7($lexer);

$traverser = new NodeTraverser();
$traverser->addVisitor(new NodeVisitor\CloningVisitor());

$printer = new PrettyPrinter\Standard();

try {
    $oldStmts = $parser->parse($code);
} catch (Error $error) {
    echo "Parse error: {$error->getMessage()}\n";
    return;
}
$oldTokens = $lexer->getTokens();

$newStmts = $traverser->traverse($oldStmts);

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

$newCode = $printer->printFormatPreserving($newStmts, $oldStmts, $oldTokens);

var_dump($newCode);