rector/rules/CodingStyle/NodeAnalyzer/ImplodeAnalyzer.php

<?php

declare (strict_types=1);
namespace Rector\CodingStyle\NodeAnalyzer;

use PhpParser\Node\Expr;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Scalar\String_;
use Rector\NodeNameResolver\NodeNameResolver;
final class ImplodeAnalyzer
{
    /**
     * @var NodeNameResolver
     */
    private $nodeNameResolver;
    public function __construct(NodeNameResolver $nodeNameResolver)
    {
        $this->nodeNameResolver = $nodeNameResolver;
    }
    /**
     * Matches: "implode('","', $items)"
     */
    public function isImplodeToJson(Expr $expr) : bool
    {
        if (!$expr instanceof FuncCall) {
            return \false;
        }
        if (!$this->nodeNameResolver->isName($expr, 'implode')) {
            return \false;
        }
        if (!isset($expr->args[1])) {
            return \false;
        }
        $firstArgumentValue = $expr->args[0]->value;
        if (!$firstArgumentValue instanceof String_) {
            return \true;
        }
        return $firstArgumentValue->value === '","';
    }
}