@ 2014-05-15T08:23:37Z <?php
function bytesToSize($bytes, $precision = 2) {
$symbols = array('B', 'Kb', 'Mb', 'Gb', 'Tb', 'Pb', 'Eb', 'Zb', 'Yb');
$exp = (int)floor(log($bytes) / log(1024));
return sprintf('%.'. $precision .'f '. $symbols[$exp], $bytes / pow(1024, floor($exp)));
}
function mem() {
return bytesToSize(memory_get_usage(true));
}
function test($msg, $test) {
$t = microtime(true);
$test($msg);
echo $msg .': <b>'. sprintf('%.6f', microtime(true) - $t) .'</b>'. PHP_EOL;
}
$array = range(0, 30000000);
test('foreach', function ($msg) use ($array) {
echo $msg . ' before loop mem: '. mem() .PHP_EOL;
foreach ($array as $v) {
$b = $v;
}
echo $msg . ' after loop mem: '. mem() .PHP_EOL;
});
test('foreach ref', function ($msg) use ($array) {
echo $msg . ' before loop mem: '. mem() .PHP_EOL;
foreach ($array as &$v) {
$b = $v;
}
unset($v);
echo $msg . ' after loop mem: '. mem() .PHP_EOL;
});
test('for', function ($msg) use ($array) {
echo $msg . ' before loop mem: '. mem() .PHP_EOL;
$so = count($array);
for ($i = 0; $i < $so; ++$i) {
$b = $array[$i];
}
echo $msg . ' after loop mem: '. mem() .PHP_EOL;
});
test('while each -> list', function ($msg) use ($array) {
echo $msg . ' before loop mem: '. mem() .PHP_EOL;
while (list($k, $v) = each($array)) {
$b =$v;
}
echo $msg . ' after loop mem: '. mem() .PHP_EOL;
});
echo 'Memory peak: ' . round(memory_get_peak_usage() / 1048576, 3) .PHP_EOL;
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Output for 7.0.0 - 7.0.20 , 7.1.0 - 7.1.25 , 7.2.0 - 7.2.13 , 7.3.0 - 7.3.1 Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 1073741832 bytes) in /in/X063o on line 19
Process exited with code 255 . Output for 5.5.0 - 5.5.35 , 5.6.0 - 5.6.28 Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 32 bytes) in /in/X063o on line 19
Process exited with code 255 . Output for 5.3.0 - 5.3.29 , 5.4.0 - 5.4.45 Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in /in/X063o on line 19
Process exited with code 255 . Output for 5.2.3 - 5.2.17 Parse error: syntax error, unexpected T_FUNCTION in /in/X063o on line 21
Process exited with code 255 . Output for 4.4.2 - 4.4.9 , 5.1.0 - 5.1.6 , 5.2.0 - 5.2.2 <br />
<b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/in/X063o</b> on line <b>21</b><br />
Process exited with code 255 . Output for 4.3.0 - 4.3.1 , 4.3.5 - 4.3.11 , 4.4.0 - 4.4.1 , 5.0.0 - 5.0.5 <br />
<b>Parse error</b>: parse error, unexpected T_FUNCTION in <b>/in/X063o</b> on line <b>21</b><br />
Process exited with code 255 . Output for 4.3.2 - 4.3.4 <br />
<b>Parse error</b>: parse error in <b>/in/X063o</b> on line <b>21</b><br />
Process exited with code 255 . preferences:dark mode live preview
177.74 ms | 401 KiB | 222 Q