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run code in 150+ php & hhvm versions
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<?php $data = array( 10, 123 ); $buf = call_user_func_array("pack", array_merge(array("N*"), $data)); $valArray = unpack( "N*", $buf ); while( list( $key, $val ) = each( $valArray ) ) { echo "$key -> $val\n"; }
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1 -> 10 2 -> 123
Output for hhvm-3.10.0

Process exited with code 153.