PHP YIELD使读取大文件变成可能
例子：摘自PHP手册
for the protection from the leaking of resources
see RFC https://wiki.php.net/rfc/generators#closing_a_generatorand use finnaly
sample code
function getLines($file) {
$f = fopen($file, "r");
try {
while ($line = fgets($f)) {
yield $line;
}
} finally {
fclose($f);
}
}
foreach (getLines("file.txt") as $n => $line) {
if ($n > 5) break;
echo $line;
}
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