3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array ( 0 => array( 0 => "a" ), 1 => array( 0 => "b", 1 => "c" ), "a" => array( "b" => "d" ) ); echo "<pre>"; print_r($arr); foreach($arr as $key=>$val){ if(is_array($val) && count($val) == 1){ $arr[$key] = array_shift($val); } } echo "<pre>"; print_r($arr);
Output for 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.25, 8.4.1 - 8.4.12
<pre>Array ( [0] => Array ( [0] => a ) [1] => Array ( [0] => b [1] => c ) [a] => Array ( [b] => d ) ) <pre>Array ( [0] => a [1] => Array ( [0] => b [1] => c ) [a] => d )
preferences:
141.49 ms | 409 KiB | 5 Q