PHP和C之间的异同

PHP是专门为Web开发设计的服务器端脚本语言。它可以轻松地嵌入HTML文件中，HTML代码也可以编写为PHP文件。使PHP与诸如HTML之类的客户端语言有所不同的是， PHP代码在服务器上执行，而HTML代码直接在浏览器上呈现。

C是一种过程编程语言。它最初是由Dennis Ritchie开发的，是一种用于编写操作系统的系统编程语言。 C语言的主要功能包括对内存的低级访问，一组简单的关键字以及简洁的样式，这些功能使C语言适用于诸如操作系统或编译器开发之类的系统编程。

PHP和C之间的相似之处

Parameters	Similarities
Syntax	Code is not sensitive to blanks. Semicolons are used for terminating a sentence. Functions are called in a similar fashion. Curly brackets are used for enclosing code in a block. C and C++ comment style is supported by PHP.
Operators	All type of operators in C behave in similar way in PHP, such as basic arithmetic, boolean, assignment and comparison operators.
Control Structure	The primary control structures such as, if-else, while, for, do-while,etc function in similar way in both the languages. Break and continue are available in both PHP and C. Switch is also same, except that in PHP strings are also accepted as case identifiers.
Function prototype	User defines functions are named in same way in both the languages.

PHP和C之间的区别

Parameters	PHP	C
Data types	PHP has only two numerical data type: integer(can be compared to long in C) double(can be compared to double in C) Strings are of random length and there is no character data type available in PHP.	C has: Primary data types(such as int, double, float, char, void, etc.) Derived data types(array, structure, union and pointer)
Type Conversion	Data types are not checked during compile-time and data type errors are rare to occur. Values and variables are automatically cast into the suitable data type.	In C variables are declared with data types. While some data types have implicit conversion, others need to be type-casted. Data type error occurs in C commonly and should be taken care.
Array	Superficially they look similar to arrays in C. Array need not be allocated or declared in advance. The indexes can be opted by user- string or a number. They are used for hashing are known as associative arrays.	Array needs to be allocated or declared in advance. Their data types and memory allocation is done before they are used in the code. The indexes can be only numbers starting from 0.
Structure	No structure type needed because of array and objects.	Structure type exists in C.
Prototypes	There are no prototype in PHP because function is not required to be declared before it’s implementation.	There are prototypes in C because function is required to be declared before its implementation.
Permissiveness	PHP is a lot more lenient when compared to C. More than errors there are unexpected results for making new mistakes.	C will give errors if data type is not declared, array size is not declared, etc. Comparing it to PHP it is a little stricter.

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