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@ 2023-02-28T11:53:37Z

<?php

$arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
$arrK = array_combine($arr, array_fill(0, count($arr), true));

$iters = 1_000_000;

$t = microtime(true);
for ($i = 0; $i < $iters; $i++) {
    $v = ($i % 2) ? 'a' : 'c';
    $res = in_array($v, $arr);
    $res = in_array($v, $arr);
    $res = in_array($v, $arr);
    $res = in_array($v, $arr);
}
var_dump(microtime(true) - $t);

$t = microtime(true);
for ($i = 0; $i < $iters; $i++) {
    $v = ($i % 2) ? 'a' : 'c';
    $res = array_key_exists($v, $arrK);
    $res = array_key_exists($v, $arrK);
    $res = array_key_exists($v, $arrK);
    $res = array_key_exists($v, $arrK);
}
var_dump(microtime(true) - $t);

$t = microtime(true);
for ($i = 0; $i < $iters; $i++) {
    $v = ($i % 2) ? 'a' : 'c';
    $res = array_key_exists($v, array_keys($arr));
    $res = array_key_exists($v, array_keys($arr));
    $res = array_key_exists($v, array_keys($arr));
    $res = array_key_exists($v, array_keys($arr));
}
var_dump(microtime(true) - $t);

print_r(opcache_get_status());

Output for git.master: float(0.10884499549865723) float(0.0714731216430664) float(0.30828213691711426)
Output for git.master_jit: float(0.10722017288208008) float(0.0714869499206543) float(0.30631113052368164) Array ( [opcache_enabled] => 1 [cache_full] => [restart_pending] => [restart_in_progress] => [memory_usage] => Array ( [used_memory] => 869576 [free_memory] => 7519032 [wasted_memory] => 0 [current_wasted_percentage] => 0 ) [opcache_statistics] => Array ( [num_cached_scripts] => 0 [num_cached_keys] => 0 [max_cached_keys] => 16229 [hits] => 0 [start_time] => 1677856746 [last_restart_time] => 0 [oom_restarts] => 0 [hash_restarts] => 0 [manual_restarts] => 0 [misses] => 1 [blacklist_misses] => 0 [blacklist_miss_ratio] => 0 [opcache_hit_rate] => 0 ) [scripts] => Array ( ) [jit] => Array ( [enabled] => 1 [on] => 1 [kind] => 5 [opt_level] => 4 [opt_flags] => 6 [buffer_size] => 8388592 [buffer_free] => 8386096 ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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