hphp/test/zend/good/ext/standard/tests/array/usort_variation9.php

   1 <?hh
   2 /* Prototype  : bool usort(&array $array_arg, string $cmp_function)
   3  * Description: Sort an array by values using a user-defined comparison function
   4  * Source code: ext/standard/array.c
   5  */
   6
   7 /*
   8  * Pass an array of referenced variables as $array_arg to test behaviour
   9  */
  10
  11 function cmp_function($value1, $value2)
  12 {
  13   if($value1 == $value2) {
  14     return 0;
  15   }
  16   else if($value1 > $value2) {
  17     return 1;
  18   }
  19   else {
  20     return -1;
  21   }
  22 }
  23 <<__EntryPoint>> function main(): void {
  24 echo "*** Testing usort() : usage variation ***\n";
  25
  26 // different variables which are used as elements of $array_arg
  27 $value1 = -5;
  28 $value2 = 100;
  29 $value3 = 0;
  30
  31
  32 $array_arg = array(
  33   0 => 10,
  34   1 => $value1,
  35   2 => $value2,
  36   3 => 200,
  37   4 => $value3,
  38 );
  39
  40 echo "\n-- Sorting \$array_arg containing different references --\n";
  41 var_dump( usort(&$array_arg, fun('cmp_function')) );
  42 var_dump($array_arg);
  43 echo "===DONE===\n";
  44 }