Performance lost form invalid array offests and indexes

notice_benchmark.php

<?php declare(strict_types=1);

// disable error logging
error_reporting(0);
// disable error display
ini_set("display_errors", '0');

function generateSmallNumericTestArray(): array
{
    $ta = [];
    for ($i = 0; $i < 5; ++$i) {
        $ta[] = $i;
    }

    return $ta;
}

function generateSmallNumericAssocTestArray(): array
{
    $ta = [];
    for ($i = 0; $i < 5; ++$i) {
        // ascii offset for uppercase letter
        $ta[chr($i + 65)] = chr($i + 65);
    }

    return $ta;
}


$testArrayNumeric = generateSmallNumericTestArray();
/*
array(5) {
    [0] =>
  int(0)
  [1] =>
  int(1)
  [2] =>
  int(2)
  [3] =>
  int(3)
  [4] =>
  int(4)
}
*/
$testArrayAssoc = generateSmallNumericAssocTestArray();
/*
array(5) {
    'A' =>
  string(1) "A"
  'B' =>
  string(1) "B"
  'C' =>
  string(1) "C"
  'D' =>
  string(1) "D"
  'E' =>
  string(1) "E"
}
*/

echo PHP_EOL.PHP_EOL;
$c = 30;
$it = 100000;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if ($testArrayNumeric[3]) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (valid) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (isset($testArrayNumeric[3])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (valid + check) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (!empty($testArrayNumeric[3])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (valid + check(empty)) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;


$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if ($testArrayNumeric[7]) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (invalid) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (isset($testArrayNumeric[7])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (invalid + check) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (!empty($testArrayNumeric[7])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayNumeric (invalid + check(empty)) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;


$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if ($testArrayAssoc['C']) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayAssoc (valid) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (isset($testArrayAssoc['C'])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayAssoc (valid + check) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (!empty($testArrayAssoc['C'])) {}
    }
    $r += microtime(true) - $t;
}
echo 'testArrayAssoc (valid + check(empty)) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;


$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if ($testArrayAssoc['Z']) {}
    }
    $r += microtime(true) - $t;
}

echo 'testArrayAssoc (invalid) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (isset($testArrayAssoc['Z'])) {}
    }
    $r += microtime(true) - $t;
}

echo 'testArrayAssoc (invalid + check) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;

$r = 0;
for ($a = 0; $a < $c; ++$a) {
    $t = microtime(true);
    for ($i = 0; $i < $it; ++$i) {
        if (!empty($testArrayAssoc['Z'])) {}
    }
    $r += microtime(true) - $t;
}

echo 'testArrayAssoc (invalid + check(empty)) ('. $it .' * '. $c .') avg: ' . ($r / $c) . PHP_EOL;


/*
testArrayNumeric (valid) (100000 * 30) avg: 0.012220096588135
testArrayNumeric (valid + check) (100000 * 30) avg: 0.01052413781484
testArrayNumeric (valid + check(empty)) (100000 * 30) avg: 0.01347184975942
testArrayNumeric (invalid) (100000 * 30) avg: 0.055137117703756
testArrayNumeric (invalid + check) (100000 * 30) avg: 0.010439761479696
testArrayNumeric (invalid + check(empty)) (100000 * 30) avg: 0.012797570228577
testArrayAssoc (valid) (100000 * 30) avg: 0.012551267941793
testArrayAssoc (valid + check) (100000 * 30) avg: 0.011203114191691
testArrayAssoc (valid + check(empty)) (100000 * 30) avg: 0.01309986114502
testArrayAssoc (invalid) (100000 * 30) avg: 0.055405537287394
testArrayAssoc (invalid + check) (100000 * 30) avg: 0.010431138674418
testArrayAssoc (invalid + check(empty)) (100000 * 30) avg: 0.013095823923747
 */

echo PHP_EOL.PHP_EOL;