What is the difference between php 5.6 and 7.0

Differences: 1. The performance of PHP7.0 is twice that of PHP5.6; 2. PHP7.0 fully supports 64-bit, but 5.6 cannot; 3. PHP7.0 adds the null combination operator "?? ", function return type declaration, scalar type declaration, anonymous class; 4. In PHP7.0, define can define constant arrays, etc.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP5.6 and PHP7.0 Difference

• #PHP7.0 has twice the performance improvement than PHP5.6.

• PHP7.0 fully supports 64-bit.

• Fatal errors that occurred before PHP7.0 were changed to throwing exceptions.

• Added null combination operator (??). The effect is equivalent to the ternary operator.

• PHP7.0 adds a new function return type declaration.

• PHP7.0 adds a new scalar type declaration.

  　The formal parameter type declaration of a function in PHP 7 can be a scalar. In PHP 5, it can only be a class name, interface, array or callable (PHP 5.4, it can be a function, including anonymous functions). Now you can also use string, int, float and bool.

• Newly added anonymous class.

  PHP 5.3 started to have anonymous functions, and now anonymous classes have been added;

• After PHP7.0, some old SAPIs that are no longer supported have been removed. (server-side application programming port) and extensions.

• #define It is now possible to define constant arrays.

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