3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_GET = ['user' => 'Bob', 'location' => 'city']; $queryStr = http_build_query($_GET); echo $queryStr, PHP_EOL; $sth = str_replace ("user", "somethingelse",$queryStr); echo $sth, PHP_EOL; $sth = substr($queryStr, 0, 9); echo $sth, PHP_EOL;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
user=Bob&location=city somethingelse=Bob&location=city user=Bob&
preferences:
85.36 ms | 408 KiB | 5 Q