PHP: Personalization syntax in relation to c#,php

Background

Today I'm familiar with the basic syntax structure of PHP, including variables, types, constants, operators, strings, scopes, and functions, and this article lists some of the structures I need to strengthen memory (unlike C #).

Some of the individual structures

foreach structure

1 
 
   1, "B" =>2); 3  4 foreach ($array as $value) {5     echo "Value$value
"; 6} 7  8 foreach ($array as $key = + $value) {9     echo "$key + $value
"; Ten}11?>

1 value12 value23 a=>14 b=>2

Global and Static scopes

Variables declared outside the function are global scopes, and the $global within the function $var equivalent to $var = $Globals ["var"]. Variables in the static scope are initialized when the function is first called, the function is not cleaned up, and subsequent function calls are no longer initialized.

1 
 
   ";}13 scope_test (); Scope_test ();?>

1//output Content 2 1, 13 2, 2

Variables of variable

1 
 
   "; 6 echo $Tom."
"; 7?>

1 I am tom2 I am Tom

Constant definition

1 
 
   "; 5?>

1//Output Content 2 3 happiness

String insertion

1 
 
   "; 6?>

1 I am tom,i am tom,i am Tom

Heredoc

1 
 
  

1//Output Content 2 3 De Guangwei

Scope of the function level

1 
 
  

1//Output Content 2 3 11

function returns multiple results

1 
 
  

1//Input Content 2 3 (1, 2)

Note

There is one more question I do not understand, I have to check the information tomorrow, the question is: How is the memory of PHP allocated and managed?

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