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@oanhnn
Created November 4, 2014 08:44
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test performance of array_diff on PHP
<?php
function my_array_diff($a, $b)
{
$map = $out = array();
foreach ($a as $val)
$map[$val] = 1;
foreach ($b as $val)
if (isset($map[$val]))
$map[$val] = 0;
foreach ($map as $val => $ok)
if ($ok)
$out[] = $val;
return $out;
}
function your_array_diff($arraya, $arrayb)
{
foreach ($arraya as $keya => $valuea) {
if (in_array($valuea, $arrayb)) {
unset($arraya[$keya]);
}
}
return $arraya;
}
function leo_array_diff($a, $b)
{
$map = $out = array();
foreach ($a as $val)
$map[$val] = 1;
foreach ($b as $val)
unset($map[$val]);
return array_keys($map);
}
function flip_array_diff_key($b, $a)
{
$at = array_flip($a);
$bt = array_flip($b);
$d = array_diff_key($bt, $at);
return array_keys($d);
}
function flip_isset_diff($b, $a)
{
$at = array_flip($a);
$d = array();
foreach ($b as $i)
if (!isset($at[$i]))
$d[] = $i;
return $d;
}
function large_array_diff($b, $a)
{
$at = array();
foreach ($a as $i)
$at[$i] = 1;
$d = array();
foreach ($b as $i)
if (!isset($at[$i]))
$d[] = $i;
return $d;
}
$a = range(1, 20000);
$b = range(5000, 25000);
shuffle($a);
shuffle($b);
$ts = microtime(true);
array_diff($a, $b);
printf("PHP =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
my_array_diff($a, $b);
printf("my_array_diff =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
your_array_diff($a, $b);
printf("your_array_diff =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
leo_array_diff($a, $b);
printf("leo_array_diff =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
flip_array_diff_key($a, $b);
printf("flip_array_diff_key =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
flip_isset_diff($a, $b);
printf("flip_isset_diff =%.4f\n", microtime(true) - $ts);
$ts = microtime(true);
large_array_diff($a, $b);
printf("large_array_diff =%.4f\n", microtime(true) - $ts);
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