to bring each of your servers to its “knees”.<\/p>\n
On part 1<\/a>, I’ve mentioned the cost of a million items when we are using arrays in PHP.<\/p>\n In this part, I want to highlight related features when we are passing such arrays to functions.<\/p>\n Let’s see the first version of the code:<\/p>\n return $array; $arr = [];<\/p>\n $L = 1000000; echo '1 item 0 -> a:' . ($arr[0]['a']) . PHP_EOL; $t1 = microtime(true); echo 'Array of ' . number_format($L) . ' arrays.' . PHP_EOL; I’ve got the best results when I used the version 4:<\/p>\n \/\/return $array; \/\/no need to return, because we are modifying the array given by reference class myClass $arr = [];<\/p>\n $L = 1000000; $t1 = microtime(true); echo 'Array of ' . number_format($L) . ' custom objects.' . PHP_EOL; You can see all the files on my github project<\/a>.<\/p>\n The surprising cases for me were version 3a and version 3b. Simply, I didn’t expect a difference of 50MB because I thought they are effectively doing the same job.<\/p>\n And here is the chart to compare them:<\/p>\n\n
\n $row) {
\n $row['a'] = strrev($row['a']);
\n\t\t$array[$i] = $row;
\n }<\/p>\n
\n}<\/p>\n
\n$S = 'abcdefghijklmnopqrstuvwxyz';
\nmt_srand();
\nfor($i = 1; $i <= $L; $i++) {\n $row = [\n 'a' => str_shuffle($S),\/\/string
\n 'b' => mt_rand(0, $L) \/ mt_rand(1, $L),\/\/float
\n 'c' => mt_rand(-1000, 1000),\/\/int
\n ];
\n $arr[] = $row;
\n}<\/p>\n
\n$arr2 = myProcess($arr);
\necho '1 item 0 -> a:' . ($arr[0]['a']) . PHP_EOL;
\necho '2 item 0 -> a:' . ($arr2[0]['a']) . PHP_EOL;<\/p>\n
\n$mem = memory_get_usage(true);<\/p>\n
\necho 'Time taken: ' . number_format($t1 - $t0, 3) . 'ms.' . PHP_EOL;
\necho 'Memory usage: ' . number_format($mem \/ 1024, 1) . 'KB.' . PHP_EOL;
\n?>
\n<\/code><\/p>\n
\n $row) {
\n $row->a = strrev($row->a);
\n\t\t\/\/$array[$i] = $row; \/\/no need because objects in arrays have references
\n }<\/p>\n
\n}<\/p>\n
\n{
\n public $a;
\n public $b;
\n public $c;
\n function __construct($a, $b, $c)
\n {
\n $this->a = $a;
\n $this->b = $b;
\n $this->c = $c;
\n }
\n}<\/p>\n
\n$S = 'abcdefghijklmnopqrstuvwxyz';
\nmt_srand();
\nfor($i = 1; $i <= $L; $i++) {\n $row = new myClass(\n str_shuffle($S),\/\/string\n mt_rand(0, $L) \/ mt_rand(1, $L),\/\/float\n mt_rand(-1000, 1000)\n );\n $arr[] = $row;\n}\n\necho '1 object 0 -> a:' . ($arr[0]->a) . PHP_EOL;
\nmyProcess($arr);
\necho '1 object 0 -> a:' . ($arr[0]->a) . PHP_EOL;<\/p>\n
\n$mem = memory_get_usage(true);<\/p>\n
\necho 'Time taken: ' . number_format($t1 - $t0, 3) . 'ms.' . PHP_EOL;
\necho 'Memory usage: ' . number_format($mem \/ 1024, 1) . 'KB.' . PHP_EOL;
\n?>
\n<\/code><\/p>\n
![\"php-memory-usage-chart-on-function-calls\"](\"http:\/\/www.muratyaman.co.uk\/wp\/wp-content\/uploads\/2015\/09\/php-memory-usage-chart-on-function-calls-300x198.jpg\")
<\/a><\/p>\n