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  1. <?php
  2.  
  3. function getBigArray($n){
  4.     $arr = [];
  5.     for ($i=0; $i<$n; $i++) {
  6.         $arr[] = $i;
  7.     }
  8.     return $arr;
  9. }
  10.  
  11.  
  12. function testSpeed1($n){
  13.     $array1 = getBigArray($n);
  14.     $array2 = getBigArray($n);
  15.     $new = [];
  16.     $start = microtime(true);
  17.     testArrayManipulation1($array1, $array2);
  18.     $new[] = $array1;
  19.     $end = microtime(true);
  20.     return $end-$start;
  21. }
  22.  
  23. function testSpeed2($n){
  24.     $array1 = getBigArray($n);
  25.     $array2 = getBigArray($n);
  26.     $new = [];
  27.     $start = microtime(true);
  28.     $new[] = testArrayManipulation2($array1, $array2);
  29.     $end = microtime(true);
  30.     return $end-$start;
  31. }
  32.  
  33. function testSpeed3($n){
  34.     $array1 = getBigArray($n);
  35.     $array2 = getBigArray($n);
  36.     $new = [];
  37.     $start = microtime(true);
  38.     $new[] = testArrayManipulation3($array1, $array2);
  39.     $end = microtime(true);
  40.     return $end-$start;
  41. }
  42.  
  43. function testArrayManipulation1(&$array1, $array2){
  44.     foreach($array2 as $v){
  45.         $array1[] = $v;
  46.     }
  47. }
  48.  
  49. function testArrayManipulation2(&$array1, $array2){
  50.     foreach($array2 as $v){
  51.         $array1[] = $v;
  52.     }
  53.     return $array1;
  54. }
  55.  
  56. function testArrayManipulation3($array1, $array2){
  57.     foreach($array2 as $v){
  58.         $array1[] = $v;
  59.     }
  60.     return $array1;
  61. }
  62.  
  63.  
  64. $n = 10;
  65. $test1 = [];
  66. $test2 = [];
  67. $test3 = [];
  68. for ($i=0; $i<$n; $i++) {
  69.     $length = 1000000;
  70.     $test1[] = testSpeed1($length);
  71.     $test2[] = testSpeed2($length);
  72.     $test3[] = testSpeed3($length);
  73. }
  74.  
  75. echo array_sum($test1)/count($test1);
  76. echo '<br>';
  77. echo array_sum($test2)/count($test2);
  78. echo '<br>';
  79. echo array_sum($test3)/count($test3);
Success #stdin #stdout 2.89s 150132KB
comments (?)
stdin 
Standard input is empty
stdout 
0.039992022514343<br>0.037306714057922<br>0.032509183883667
https://ideone.com/v7sepC
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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