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@ 2017-05-21T22:48:28Z

<?php

// generic function to generate cross product of multi-dimensional array
function arrayCrossProduct( array $data ) {
  $rowCount = 1;

  foreach( $data as &$datum ) {
    $datum = (array) $datum;
    $rowCount *= count( $datum );
    reset( $datum ); // reset the array, just to be sure
  }
  unset( $datum ); // drop the reference, just to be safe

  $result = array();
  while( $rowCount-- > 0 ) {
    $row = array();
    foreach( $data as &$datum ) {
      $row[] = current( $datum );
    }
    $result[] = $row;

    foreach( $data as &$datum ) {
      next( $datum );
      if( !is_null( key( $datum ) ) ) {
        break;
      }
      reset( $datum );
    }
  }

  return $result;
}

// example data
$data = array(
  'name'     => 'Mike',
  'country'  => 'UK',
  'prefers'  => array( 'coffee', 'milk', 'bananas' ),
  'age'      => 25,
  'parents'  => array( 'John', 'Janine' ),
  'children' => array( 'Jack', 'Jill', 'Joline' )
);

$i = 1;
foreach( arrayCrossProduct( $data ) as $row ) {
  echo str_pad( (string) $i++, 2, " ", STR_PAD_LEFT ) . '. ' . implode( ', ', $row ) . PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: 1. Mike, UK, coffee, 25, John, Jack 2. Mike, UK, milk, 25, John, Jack 3. Mike, UK, bananas, 25, John, Jack 4. Mike, UK, coffee, 25, Janine, Jack 5. Mike, UK, milk, 25, Janine, Jack 6. Mike, UK, bananas, 25, Janine, Jack 7. Mike, UK, coffee, 25, John, Jill 8. Mike, UK, milk, 25, John, Jill 9. Mike, UK, bananas, 25, John, Jill 10. Mike, UK, coffee, 25, Janine, Jill 11. Mike, UK, milk, 25, Janine, Jill 12. Mike, UK, bananas, 25, Janine, Jill 13. Mike, UK, coffee, 25, John, Joline 14. Mike, UK, milk, 25, John, Joline 15. Mike, UK, bananas, 25, John, Joline 16. Mike, UK, coffee, 25, Janine, Joline 17. Mike, UK, milk, 25, Janine, Joline 18. Mike, UK, bananas, 25, Janine, Joline

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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