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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$product1 = "1";
$a = ["1", "2", "3", "4"];
//не применять скидку 3% для определенных id
if (array_search($product1, $a)) $a = "да";
else $a = "нет";
echo $a;