Online PHP editor | output for rb7bD

@ 2017-06-30T10:34:39Z

<?php

    $products = [451, 455, 453]; 
    $mod = count($products);
    
    $days = null;

    $weekdays = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"];
    $flipped = array_flip($weekdays);

   
    $callback = function( $e ) use( $mod ) {
                         return ($e % $mod);
                      };

    $days = array_map( $callback, array_keys( $weekdays ) );
    
    // listing each weekday's product ID
    foreach ($flipped as $wday => $dex) {
           echo "$wday, ";
           echo $products[ $days[$dex] ], "\n";
    }

   // get current product ID: 
   $now = time();
   $today = date("l",$now);
   $dex = $flipped[ $today ];
   echo "\nToday is $today and the current product ID is ", $products[ $days[ $dex ] ];

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 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 - 7.3.21, 7.4.0 - 7.4.9: Monday, 451 Tuesday, 455 Wednesday, 453 Thursday, 451 Friday, 455 Saturday, 453 Sunday, 451 Today is Wednesday and the current product ID is 453
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/rb7bD on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/rb7bD on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/rb7bD on line 3
Process exited with code 255.

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