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expression — Bind prepared statement variables as parameters
$expression): object
本函数还未编写文档，仅有参数列表。
expression
示例 #1 mysql_xdevapi\Expression() example
<?php
$expression = mysql_xdevapi\Expression("[age,job]");
$res = $coll->find("age > 30")->fields($expression)->limit(3)->execute();
$data = $res->fetchAll();
print_r($data);
?>以上示例的输出类似于：
<?php