<?php
$a = "define('DB_PASSWORD', 'fuuu'); fuuu";
$b = 'define("DB_PASSWORD", "fuuu"); fuuu';
$c = 'DEFINE("DB_PASSWORD", "fuuu"); fuuu';
$d = "DEFINE('DB_PASSWORD', 'fuuu'); fuuu";
$new = preg_quote("un}C)y~&tSzb");
echo preg_replace('/define\([\'\"]db_password[\'\"],\s*[\'\"]'.$new.'[\'\"]/i', 'define("DB_PASSWORD", "123456")', $a) . "\n";
echo preg_replace('/define\([\'\"]db_password[\'\"],\s*[\'\"]'.$new.'[\'\"]/i', 'define("DB_PASSWORD", "123456")', $b) . "\n";
echo preg_replace('/define\([\'\"]db_password[\'\"],\s*[\'\"]'.$new.'[\'\"]/i', 'define("DB_PASSWORD", "123456")', $c) . "\n";
echo preg_replace('/define\([\'\"]db_password[\'\"],\s*[\'\"]'.$new.'[\'\"]/i', 'define("DB_PASSWORD", "123456")', $d) . "\n";
preferences:
41.63 ms | 402 KiB | 5 Q