3v4l.org

run code in 300+ PHP versions simultaneously
<?php $testSite = array( 'name' => 'test site', 'modules' => array( 'foo' => 'true', 'bar' => 'true' ) ); $testData = array( 'modules' => array( 'bar' => 'false' ) ); print_r('before ' . $testSite); $testSite = array_merge_recursive($testSite, $testData); print_r('after ' . $testSite);

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