/* regular data types */ #define IS_UNDEF 0 #define IS_NULL 1 #define IS_FALSE 2 #define IS_TRUE 3 #define IS_LONG 4 #define IS_DOUBLE 5 #define IS_STRING 6 #define IS_ARRAY 7 #define IS_OBJECT 8 #define IS_RESOURCE 9 #define IS_REFERENCE 10 /* constant expressions */ #def...
Discover what is PHP, a vital server-side scripting language for dynamic web development and creating interactive websites.
echo "This is a test"; /* This comment will cause a problem */ */ ?> echo "这是第三种例子。\n"; # 本例使用 UNIX Shell 语法注释 PHP数据类型 数据类型 四种标量类型: ? boolean(布尔型):表达了真值,可以为 TRUE 或 FALSE。 要指定一个布尔值,使用关键字 TRUE 或 FALSE。两个都不区分大小...
echoConstant;// outputs "Constant" and issues a notice. ?> PHP变量 变量: 变量用一个美元符号($)后面跟变量名来表示。变量名是区分大小写的。 一个有效的变量名由字母或者下划线开头,后面跟上任意数量的字母,数字或下划线。 PHP是一门松散类型的语言(Loosely Typed Language) 在PHP中,不需要在设置变量之前...
If you put"27"within quotes, it will evaluate as a string. PHP is aloosely typedlanguage, which means that it will try to convert the data it is given based on the request. If you set a variable to27, when used in concatenation with a string, PHP will parse the variable as a stri...
PHP is a Loosely Typed Language In the examples above, notice that we did not have to tell PHP which data type the variable is. PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like...
PHP is a Loosely Typed Language PHP Variables Scope PHP has three different variable scopes: local global static PHP also stores all global variables in an array called $GLOBALS[index]. Theindexholds the name of the variable. 1<?php2$x= 5;3$y= 10;45functionmyTest() {6$GLOBALS['y']...
PHP is a Loosely Typed Language In the example above, notice that we did not have to tell PHP which data type the variable is. PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like...
?>PHP 是一门松散类型的语言(Loosely Typed Language) 在PHP 中,不需要在设置变量之前声明该变量。 在上面的例子中,您看到了,不必向 PHP 声明该变量的数据类型。 根据变量被设置的方式,PHP 会自动地把变量转换为正确的数据类型。 在强类型的编程语言中,您必须在使用前声明变量的类型和名称。
PHP is aloosely-typed language, which means it’s not too fussy about the types of data that you pass around a script. For example, you can happily pass a numeric value to PHP’sstrlen()function for calculating the length of a string. PHP first converts the number into the string, th...