二.PHP的数据类型(php学习)
1 、 PHP 基本语法和数据类型:
( 1 )、 PHP 基本语法:
1 、 htm 和 php 混编
2 、一个语句以 ; ( 分号结束 )
( 2 )、 PHP 数据运算 类型
四种标量类型:
boolean (布尔型) 理解为真假型
integer (整型)
float (浮点型,也作 “ double ” ) 理解为小数型
string (字符串)
两种复合类型:
array (数组)
object (对象)
boolean (布尔型) 理解为真假型
$bo=TRUE; $bo=FALSE;
integer (整型)
$bo= 1; $bo=-12;
float (浮点型,也作 “ double ” ) 理解为小数型
$bo= 1.001; $bo=3.1415926;
string (字符串)
$bo = “ 这段字符串 or EN Word”;
array (数组)
$bo =array(1,2,3,4); $bo=array(“A”=>1 , “B”=>2);
自定义变量首字母定义只能是:_ ,a-z,A-Z开头.
字符串可以使用单引号和双引号,区别在于单引号不能使用(不支持)转义字符.
Linux下设置目录为:777:是最高权限,能读取和写入
设置目录755:只能读取 上传时可以再ftp工具上设置,选择文件-->属性-->数字值.
上传Discuz论坛时请设置上传方式为:二进制.

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