Analyze the difference between php7 and PHP5 in detail


1. PHP scalar type and return type declarations

#There are two main modes: mandatory mode and strict mode
#1 indicates strict type verification mode, which is used for function calls and return statements; 0 indicates weak type verification mode.

2. Null merge operator

$site = isset($_GET['site']) ? $_GET['site'] : 'wo';
#Abbreviated as
$site = $_GET['site'] ??'wo';

3. Combination budget symbol

//Integer comparison
print( 1 <=> 1);print(PHP_EOL);
print( 1 <=> 2);print(PHP_EOL);
print( 2 <=> 1);print(PHP_EOL);
print(PHP_EOL); //  PHP_ EOL is a newline character

4. Constant array

//Use the define function to define an array
define('sites', [


5. Anonymous class

interface Logger { 
   public function log(string $msg); 

class Application { 
   private $logger; 

   public function getLogger(): Logger { 
      return $this->logger; 

   public function setLogger(Logger $logger) { 
      $this->logger = $logger; 

$app = new Application; 
//Create an anonymous class using new class 
$app->setLogger(new class implements Logger { 
   public function log(string $msg) { 

$app - > getlogger() - > log ("my first log");

6. The closure:: call() method is added to bind an anonymous function to the class

class A { 
    private $x = 1; 

//Closure function code defined in PHP before version 7 
$getXCB = function() { 
    return $this->x; 

//The closure function is bound to class A 
$getX = $getXCB->bindTo(new A, 'A');  

echo $getX(); 

//PHP 7 + code 
$getX = function() { 
    return $this->x; 
echo $getX->call(new A); 

7. Csprng (pseudo random number generator).

PHP 7 provides a simple mechanism to generate cryptographically strong random numbers by introducing several csprng functions.

random_ Bytes () – encrypt the protected pseudo-random string.

random_ Int () – a pseudo-random integer protected by encryption.

8. Abnormal

PHP 7 exceptions are used for downward compatibility and enhancement of the old assert() function.

9. Use statement change

#Class abbreviations under the same namespace can be imported
use some\namespace\{ClassA, ClassB, ClassC as C};

10. Session options

//1. session_ Start() can define an array
   'cache_limiter' => 'private',
   'read_and_close' => true,
//2. Introduced a new PHP Ini setting (session. Lazy_write), which is set to true by default, means that session data is written only when it changes.

11. PHP 7 removed extensions

  • ereg
  • mssql
  • mysql
  • sybase_ct

Why is php7 better than PHP5?

1. Variable storage bytes are reduced to reduce memory consumption and improve variable operation speed

2. The array structure is improved. The array elements and hash mapping table are allocated in the same memory, which reduces the memory occupation and improves the CPU cache hit rate

3. The function calling mechanism is improved. By optimizing the link of parameter transmission, some instructions are reduced and the execution efficiency is improved

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