Description:
------------
PHP v7.1.0RC1 on Ubuntu 15.04.
Looks like all 7.* versions affected, but works fine with php 5.5 and 5.6 versions.
Default php.ini-development config was used.

Test script demonstrates some strange oci_execute / oci_bind_by_name behaviour.
Code intentionally simplified and may look strange.
Example below leads to segfault after `$stmt->execute();`.
Some slight changes or reordering lines / commands may lead to other result.

Also it may be related to https://bugs.php.net/bug.php?id=73080

Test script:
---------------
<?php
class Statement
{
    private $stmt;

    function __construct($sql) {
        $this->connection = oci_connect('user', 'password', 'db', 'UTF8');
        $this->stmt = oci_parse($this->connection, $sql);
    }

    function execute() {
        oci_execute($this->stmt);
    }

    function runOciFunctionAndHandleResult($funcName, array $funcArgs) {
        call_user_func_array("oci_$funcName", $funcArgs);
    }

    function bind($name, &$variable) {
        $args = func_get_args(); // without this assigning result to variable works fine!
        // $args not used here, because original code a bit simplified to demonstration strange behaviour
        $this->runOciFunctionAndHandleResult(
            'bind_by_name',
            [$this->stmt, ":$name", &$variable]
        );
    }

    function bindParams(array $bindParams = []) {
        foreach ($bindParams as $bvName => &$bvValue) {
            $this->bind($bvName, $bvValue[0]);
        }
    }
}

$stmt = new Statement(
    'declare
         lp1 varchar2(1000); lp2 varchar2(1000);
     begin
         lp1 := :p1; lp2 := :p2;
     end;'
);
$stmt->bindParams(['p1' => ['xxxxxxxxxxxxxxxxxxxxxxxx']]); // 24 or more chars would lead to segfault
$stmt->bind('p2', $code);

$stmt->execute();



Actual result:
--------------
Segmentation fault (core dumped)