PHP, JScript and VBScript functions and class syntax _ PHP Tutorial

PHP, JScript, and VBScript functions and class syntax. 1) function example php: functioninc ($ val) {return $ val + 1;} is also a function, but no return value. Example of the jscript, javascript: functioninc (val) {returnval + 1;} process 1) function
Php: function inc ($ val)
{Return $ val + 1 ;}

The process is also a function, but there is no return value.
Jscript, javascript:
Function inc (val)
{Return val + 1 ;}
The process is defined as above.
VBScript:
Function inc (val)
Inc = val + 1
End function
Procedure
Sub inc2 (byref val)
Val = val + 1
End sub
2) Class example
Php:
Class parent {
Var property;
Function parent (){}
Function method (){}
}

/* Inherit */
Class child extends parent {var property = new value;
}

Jscript or javascript:
Class parent {
Property = value
Function parent () function method (){}}

Inheritance is not supported (the original document is like this, but it seems that inheritance is supported now)
Vbscript:
Does not support classes (The original article is like this, but now also supports)

3) variable range
Php: variables allow global variables in functions or out-of-class definitions. you can also define local variables in functions and classes.
Unlike other languages, when using variables, you must name a global variable and use the keyword global in functions and classes.
$ Globalvar = 1;
Function show_global (){
Global $ globalvar;
Print $ globalvar;
}
Jscript or javascript:
Similar to PHP, global variables do not need to be declared in functions.
Vbscript:
Similar to PHP, global variables do not need to be declared in functions and procedures.

4) access reference
Php: use keywords in function parameters.
Jscript or javascript
Simple access through variables, referencing complex types in functions
Vbscript:
Use the ByRef keyword in the Sub or function parameters.

5) default parameters
Php: function A (param1 = "abc") is supported ")
Others are not supported.

6) return a reference (I do not know how to flip)
Php: function getarray123 (){
$ Val = array (1, 2, 3 );
Return & $ val;
}
Then use

$ Val = & getarray123 ();
Other unsupported

7) class
Php: better support
Others: Average

8) handle errors
Php: Use @ to prevent running errors.

$ Val = @ function_can_fail ();

@ The range is the current Declaration. The final error can be checked in $ php_errormsg. if you set track_errors = On in PHP. ini.
Javascript or jscript:
Use try and catch.

Try {
Function_can_fail ()
} Catch (err) {Response. Write (err)
}
Vbscript:
Ignore running errors using On Error Resume Next
The new version also supports try and catch.

In addition, there is a comparison about language. if you are interested, you can translate it.

Http://www.bkjia.com/PHPjc/532501.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/532501.htmlTechArticle1) function example php: function inc ($ val) {return $ val + 1;} the process is also a function, but there is no return value. Jscript, javascript: function inc (val) {return val + 1;} process...