dba_firstkey

(PHP 4, PHP 5, PHP 7, PHP 8)

dba_firstkey — Fetch first key

说明

dba_firstkey(resource $dba): string|false

dba_firstkey() returns the first key of the database and resets the internal key pointer. This permits a linear search through the whole database.

参数

dba: The database handler, returned by dba_open() or dba_popen().

返回值

Returns the key on success 或者在失败时返回 false.

参见

dba_nextkey() - Fetch next key
dba_key_split() - Splits a key in string representation into array representation
Example 2 in the DBA examples

add a note

User Contributed Notes 3 notes

down

jacky dot jackyhung dot net ¶

20 years ago


for ($key = dba_firstkey($this->handle); $key !== false; $key = dba_nextkey($this->handle)) {
            $keyset[] = $key;
        } // end for

down

-1

rcracer91 at gmail dot com ¶

12 years ago


I wondered why it wasn't already written, so I did because I think working with associative arrays is always as comfortable as can be

<?php
function dba_fetch_assoc($handle) {
    $assoc = array();
    for($k = dba_firstkey($handle); $k != false; $k = dba_nextkey($handle)) {
        $assoc[$k] = dba_fetch($k, $handle);
    }
    return $assoc;
}
?>

down

-1

psycho-logic at excite dot com ¶

18 years ago


Looks like Jacky is using some DB object? I don't know if it's native to PHP or written on it's own... Anyways this is what I use:

$DBCon = dba_open("/tmp/test_db.db2", "r", "db2") or die("Uh oh, can't open the database :(");
if ($the_key = dba_firstkey($DBCon)) do {
    print("Key: $the_key    Value:");
    print dba_fetch($the_key, $DBCon);
    print("<BR>");
} while ($the_key = dba_nextkey($DBCon));
print ("<BR><BR><BR>Well looks like we're done here :-)");

add a note

官方地址：https://www.php.net/manual/en/function.dba-firstkey.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 adodb手册 ADORecordSet对象 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet mysql面试题 PHP json解析（json_decode）页面工具 php中几种注释规范 [原创]诡异的php-fpm超时问题纯php实现DES以及TripleDES加密算法 php 修改图片大小支持php7的性能采集扩展 PHP5 扩展SOAP 调用 webservice

略微加速

PHP官方手册 - 互联网笔记

dba_firstkey

说明

参数

返回值

参见

User Contributed Notes 3 notes