hphp/test/zend/good/ext/standard/tests/array/usort_variation7.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 anonymous comparison function as $cmp_function argument to test behaviour()
   9  */
  10 <<__EntryPoint>> function main(): void {
  11 echo "*** Testing usort() : usage variation ***\n";
  12
  13 $cmp_function = ($value1, $value2) ==> { if($value1 == $value2) {return 0;} else if($value1 > $value2) {return 1;} else{return -1;} };
  14 $cmp_function_ref = (&$value1, &$value2) ==> { if($value1 == $value2) {return 0;} else if($value1 > $value2) {return 1;} else{return -1;} };
  15
  16 $array_arg = array(0 => 100, 1 => 3, 2 => -70, 3 => 24, 4 => 90);
  17
  18 echo "\n-- Anonymous 'cmp_function' with parameters passed by value --\n";
  19 var_dump( usort(&$array_arg, $cmp_function ) );
  20 var_dump($array_arg);
  21
  22 $array_arg = array("b" => "Banana", "m" => "Mango", "a" => "Apple", "p" => "Pineapple");
  23
  24 echo "\n-- Anonymous 'cmp_function' with parameters passed by reference --\n";
  25 var_dump( usort(&$array_arg, $cmp_function_ref) );
  26 var_dump($array_arg);
  27 echo "===DONE===\n";
  28 }