After following, you can keep track of his dynamic information in a timely manner
1,is_null 測試某一個(gè)變量是不是null 什么時(shí)候會(huì)null，未初始化、null、unsert 2,empty(), 3,isset()
2018-04-130個(gè)贊
Courses in the relevant section：Scope of variables (emphasis)
$GLOBAL['setname'] 局部變量引用全局變量 靜態(tài)變量 static $num = 1 只聲明一次 全局變量 $REQUEST = $GET+$POST+COOKIE
外部變量 函數(shù)內(nèi)部引用需要用global，或者外部直接聲明為全局變量 $global()
2020-11-110個(gè)贊
Courses in the relevant section：Front-end form production
前端表單制作： form ——caption autofocus select——option checkbox ——lang[] textarea_rows=3 cols=30 colspan =2
2019-08-060個(gè)贊
Courses in the relevant section：Chained implementation of PDO preprocessing query operations
鏈?zhǔn)秸{(diào)用不了
2018-05-030個(gè)贊
Courses in the relevant section：Library encapsulation connection operation
lib 庫文件
2018-05-030個(gè)贊
Courses in the relevant section：Simplify pagination code
簡化的上下頁無效$page不是變量？
2018-05-040個(gè)贊
Courses in the relevant section：Project launch and software use (2)
這里是相冊(cè)引入scrip，生成動(dòng)態(tài)的相冊(cè)
2018-08-210個(gè)贊
