What is the difference between PHP7.1 and 5.6

The difference between PHP7.1 and 5.6: 1. Version 7.1 fully supports 64-bit, while version 5.6 does not support all; 2. Version 7.1 removes some old server-side applications that are no longer supported. Port extension, but version 5.6 has not removed it; versions 3 and 7.1 added function return type declarations and anonymous classes, but version 5.6 does not.

The operating environment of this article: Windows 10 system, PHP7.1&&PHP5.6 version, Dell G3 computer

What is the difference between PHP7.1 and 5.6

1. The difference between the two

1.PHP7.1 has twice the performance improvement than PHP5.6.

2.PHP7.1 fully supports 64-bit.

3.Fatal errors that occurred before PHP7.1 were changed to throwing agenda.

4. The null combination operator (??) is added, which is equivalent to the ternary operator.

5.PHP7.1 adds a new function return type declaration.

6.PHP7.1 adds a new scalar type declaration.

7. The formal parameter type declaration of a function in PHP7 can be a scalar. In PHP5, it can only be a class name, interface, array or callable (PHP5.4, that is, it can be a function, including anonymous functions). Now you can also use string, int, float and bool.

8. Anonymous classes are newly added in PHP7.1.

9.After PHP7.1, some old SAPI (server-side application programming port) and extensions that are no longer supported have been removed.

10.define can define constant arrays.

2. New features of PHP7.0

1. Type declaration

You can use string, Integers (int), floating point numbers (float), and Boolean values ​​(bool) are used to declare the function parameter types and function return values.

Scalar declaration type mode: forced mode (default mode) and strict mode

declare(strict_types=1), must be placed at the top to ensure that the file execution is valid.

2. Exception handling

PHP7.0 avoids the previous fatal errors. Instead, it inherits the Error class and throws the error so that the developer can correct the program. The control ability is stronger.

3. New operator "<=>"

Syntax: $x = $y <=> $z

If $y> $ z, the value of $x is 1

If $y == $z, the value of $x is 0

If $y < $z, the value of $x is -1

4. Add operation fee "??"

If the variable exists and the value is not NULL, return its own value, otherwise return the second operand.

5.define() defines constant array

6.Anonymous function

7.Unicode character format support (echo"/u {1234}")

8.Unserialize provides filtering features

to prevent code injection of illegal data and provide safer deserialized data.

9. Namespace reference optimization

Files in the same folder support the introduction of array format

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