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PHP开发基础教程
2025-12-17 19:17:44
PHP开发基础教程
$ 符号 //定义变量或者对象
echo //输出
var_dump() //打印
int //数字类型
string //字符串类型
boolean(true 或 false)// 布尔型
array //数组
json_encode //变量进行 JSON 编码
json_decode// JSON 编码进行解码
date() //日期
sessions //储存用户会话
$_FILES //文件类型
die //中止程序
isset //判断是否变量
empty() //检查变量是否为空
if() else(){} //判断语句
foreach($a as $k=>$v){} //循环语句
for($i=1;$i<=10;$i++){} //循环语句
while //循环语句
do..while//先执行一次,再循环语句
//连接数据库
$connec=_connect(\"localhost\",\"root\", \"root\") or die(\"不能连接库:\".mysql_error());
mysql_select_db(\"liuyanben\",$connec) or die (\"不能选择数据库:\".mysql_error());
mysql_query(\"set names \'gbk\'\");
$_POST //表单获取数据
$_GET //表单获取数据
\
换行
\\r 回车
\\t 水平制表符
\\\\ 反斜线
function(){}函数
可变类名 class CLS{public $k = \'hello\';} $i = \'CLS\'; $j = new $i; echo $j->k;
可变属性 class CLS{public $k = \'hello\';} $i = \'k\'; $j = new CLS; echo $j->$i;
可变方法 class CLS{public function k(){echo \'hello\';}} $i=\'k\'; $j=new CLS; $j->$i();
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#编程
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CONNECT:[ UseTime:0.000385s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000597s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008541s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000238s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000497s ]
SELECT * FROM `set` [ RunTime:0.001045s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000522s ]
SELECT * FROM `article` WHERE `id` = 456618 LIMIT 1 [ RunTime:0.013726s ]
UPDATE `article` SET `lasttime` = 1766207276 WHERE `id` = 456618 [ RunTime:0.004213s ]
SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000200s ]
SELECT * FROM `article` WHERE `id` < 456618 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005378s ]
SELECT * FROM `article` WHERE `id` > 456618 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000621s ]
SELECT * FROM `article` WHERE `id` < 456618 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002492s ]
SELECT * FROM `article` WHERE `id` < 456618 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.040922s ]
SELECT * FROM `article` WHERE `id` < 456618 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.052531s ]
0.198771s