php 踩坑 PDO foreach bindParam

Official document https://www.php.net/manual/zh/pdostatement.bindparam.php

Note:

bindParam The second parameter is mixed &$variable is reference by value

Correct usage ($val by reference):

 &$val) { $sth->bindParam($key, $val); } ?>

Wrong usage ($val by value, because bindParam needs &$ variable):

 $val) { $sth->bindParam($key, $val); }

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