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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr = ['str1', 'str2', 'str3'];
// Вариант 1
foreach ($arr as $key => $value) {
$arr[$key] .= ' modified';
}
// Вариант 2
array_walk($arr, fn (&$value) => $value .= ' modified');