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@ 2019-03-18T18:09:21Z

<?php

$array = array('test1', 'test2', 'test3', 'test4');
$var = 'test';
$iterations = 1000000;

$start = microtime(true);
for($i = 0; $i < $iterations; ++$i) {
    if ($var != 'test1' && $var != 'test2' && $var != 'test3' && $var != 'test4') {}
}
$end = microtime(true);

print "multiple comparisons: \n". ($end - $start)."\n";

$start2 = microtime(true);
for($i = 0; $i < $iterations; ++$i) {
    if (!in_array($var, $array) ) {}
}
$end2 = microtime(true);

print "in_array: \n".($end2 - $start2)."\n";

$start = microtime(true);
$array_flip = array_flip($array);

for($i = 0; $i < $iterations; ++$i) {
    if (!isset($array_flip[$var])) {}
}
$end = microtime(true);
print "array_flip() outside loop measured + isset(): \n".($end - $start)."\n";

$array_flip = array_flip($array);
$start = microtime(true);

for($i = 0; $i < $iterations; ++$i) {
    if (!isset($array_flip[$var])) {}
}
$end = microtime(true);
print "array_flip() outside loop not measured + isset(): \n".($end - $start)."\n";

$start = microtime(true);

for($i = 0; $i < $iterations; ++$i) {
    foreach ($array as $entry) {
        if ($entry == $var) {}
    }
}
$end = microtime(true);
print "foreach and compoarison: \n".($end - $start)."\n";

Output for git.master_jit: multiple comparisons: 0.039385080337524 in_array: 0.019988059997559 array_flip() outside loop measured + isset(): 0.0079290866851807 array_flip() outside loop not measured + isset(): 0.0080349445343018 foreach and compoarison: 0.034224033355713
Output for git.master: multiple comparisons: 0.039248943328857 in_array: 0.019210815429688 array_flip() outside loop measured + isset(): 0.010743856430054 array_flip() outside loop not measured + isset(): 0.01138710975647 foreach and compoarison: 0.041465997695923
Output for rfc.property-hooks: multiple comparisons: 0.03361701965332 in_array: 0.01665210723877 array_flip() outside loop measured + isset(): 0.0084528923034668 array_flip() outside loop not measured + isset(): 0.0084578990936279 foreach and compoarison: 0.034188032150269

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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