<?php declare(strict_types = 1); $data = [ 'c1' => 12, 'rasd' => 13, 'c34' => 15, ]; foreach ($data as $key => $value) { $match = []; if (false === preg_match('/^c(\d+)$/', $key, $match) || empty($match)) { continue; } var_dump($key); var_dump($value); }
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