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PHP核心知识要点汇总一:记好这些,学习php会进步一大截

PHP核心知识要点汇总一:记好这些,学习php会进步一大截

匿名函数

伪类型:mixed, number callback void

数据类型转换:int,integer, bool ,Boolean,float,string,array,object,自动转换(值转换)

数据类型判断:is_bool,is_float,is_integer,is_object,is_array,is_string,is_resource,is_scalar,is_null,is_numeric,gettype,settype

引用文件:require,include,require_once,include_once,作用(布局,包含公共文件),文件载入原理(加载非执行,将编译后的文件加载),require和include的区别,文件返回(配置文件)

终止脚本:return,exit,die

载入文件路径:绝对路径,相对路径(./,../,/),文件载入的相对路径问题

字符

串相关函数:strlen,substr,strtolower,strtoupper,strrev,strpos,strrpos,strchr,strrchr(获取文件后缀名),trim

时间相关函数:time,date,strtotime,microtime

数组:概念,使用数组原因(变量关联),PHP数组特点(没有数据类型,数组下标可为 字符串 [不能使用for循环遍历],数组长度可变不会溢出),数组定义(array,[]),数组不能直接echo,数组长度(count,遍历), foreach (原理:赋值+指针下移)

二维数组:定义,语法,二维数组遍历,关联二维数组,遍历

each +list:each(语法),list(语法,只能获得 索引 数组元素,按照索引顺序赋值),each和list组合遍历数组,each与foreach区别(foreach原理,each原理)

数组相关函数:key,current,next,prev,end ,reset,array_keys,array_values,数据结构模拟(array_shift,array_unshift,array_push,array_pop),字符串分割(explode,implode),array_walk_recursive(回调函数,按址传递)

数组运算:+,array_merge

数组比较:==,===

其他函数: range,array_rand,shuffle

SQL 注入:原理,解决方案(addslashes,magic_quotes_gpc),公共函数(array_walk_recursive对$_POST转义)

数组算法:排序(冒泡,插入,选择,快排),查找(自定义查找,二分法)

表单传值:网站目的(数据管理:收集,整理,存储,发布),收集(表单实现),数据传递(url,form),传值方式(get,post)

数据接收:$_GET,$_POST,$_REQUEST,数据处理,$_REQUEST不值得信任(覆盖,request_order,variables_order)

点击行为判断:isset($_POST[‘submit’])/empty()

自动配置全局变量:register_gloabals

复选框 使用:[],入库(字符拼接),显示复选框信息(checked),批量删除

文件上传:概念,难点(浏览器端,服务端),流程(表单post,enctype=’multipart/form-data’,PHP配置file_uploads,配置项说明(file_uploades,upload_max_filesize,post_max_size,upload_tmp_dir)),文件上传流程(本地选择文件,提交,文件发送到服务器临时目录,转义临时文件)

PHP处理:$_FILES,$_FILES说明,文件移动(copy,move_uploaded_file),验证文件类型(MIME),文件重命名(唯一性,可识别区分)

上传函数封装

多文件上传:数组,$_FILES处理

文章来源:智云一二三科技

文章标题:PHP核心知识要点汇总一:记好这些,学习php会进步一大截

文章地址:https://www.zhihuclub.com/76926.shtml

关于作者: 智云科技

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