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The biggest difference is: a scalar can only store one data, while an array can store multiple data; and the scalar type is passed by value, while the array is passed by reference. In PHP, there are four types of scalar data: Boolean, string, integer, and floating point. They can only store one value at a time; and an array is a collection of data that can store any number of any type. data.
The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer
php scalar data and The difference between arrays
The biggest difference: a scalar can only store one data, while an array can store multiple data.
Other differences: Scalar types are passed by value, while arrays are passed by reference.
The scalar data type is the most basic unit of the data structure and can only store one piece of data. There are four types of scalar data types in PHP:
Type | Function |
---|---|
boolean (Boolean) | The simplest data type, only two values: true (true) / false (false) |
string (String) | A string is a continuous sequence of characters |
integer (integer) | The integer data type contains all integers. It can be an integer or a negative number |
float (floating point type) | The floating point data type is also used to store numbers. Unlike integers, it contains decimals |
1) Boolean
Boolean type is more commonly used in PHP One of the data types, which holds a true value (true) or a false value (false)
// 代码: $a = true; // 真值 $b = false; // 假值
2) String (string)
A string is a continuous sequence of characters, consisting of numbers, letters, and symbols. Each character in the string only occupies one byte. Characters include the following types
Character type name | Content |
---|---|
Number type | For example: 1, 2, 3, etc. |
Letter type | For example: a, b, c, etc. |
Special types | For example: #,$,^,&, etc. |
For example:\ n (line feed character), \r (carriage return), \t (tab character), etc. |
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