asp to php

ASP and PHP are two common server-side scripting languages, which are widely used to develop various types of websites and applications. Due to historical reasons or personal preferences, some developers may need to convert existing ASP code into PHP code. This article will introduce some tips and points to note when converting ASP into PHP.

1. Differences in syntax

First of all, you need to understand that there are big differences in the syntax of ASP and PHP. In fact, the syntax and structure of the two languages are completely different. ASP mainly uses VBScript language, while PHP uses C language style syntax.

Here are some examples of syntax differences:

Declare variables:

ASP:Dim a
PHP:$a;

Output content:

ASP：Response.Write("Hello World")
PHP：echo "Hello World";

Loop statement:

ASP：
For i = 0 To 10
Response.Write(i)
Next

PHP：
for($i=0; $i<=10; $i ){
echo $i ;
}

As you can see from the above examples, even basic blocks of code can vary greatly. Therefore, to convert ASP code into PHP code, you need to carefully understand the syntax differences.

2. Function call

There are also some differences between ASP and PHP when it comes to function calls. ASP function calls are usually wrapped in parentheses, while PHP uses the function name directly. For example:

ASP：Mid("string",1)
PHP：substr("string",0,1)

ASP：Left("string",3)
PHP：substr("string",0,3)

ASP：Right("string",5)
PHP：substr("string",-5)

It should be noted here that the second parameter of the Mid function starts from 0 in PHP. Therefore, the original parameter needs to be subtracted by 1.

3. Database call

There are also some differences between ASP and PHP when it comes to database calls. ASP usually uses ADO (ActiveX Data Objects) objects to call databases, while PHP mainly uses database connection tools such as MySQL and SQLite.

ASP code:

Set conn = Server.CreateObject("ADODB.Connection")
conn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d: \db\test.mdb"
Set rs = Server.CreateObject("ADODB.Recordset")
rs.Open "SELECT * FROM user", conn
Do While Not rs.EOF
Response .Write rs("username")
rs.MoveNext
Loop
rs.Close
conn.Close

PHP code:

$conn = mysql_connect( "localhost", "username", "password");
mysql_select_db("test", $conn);
$result = mysql_query("SELECT username FROM user");
while ($row = mysql_fetch_assoc($result)) {
echo $row["username"];
}
mysql_free_result($result);
mysql_close($conn);

From the above example It can be seen that there are big differences in the ways of connecting to the database and querying data between ASP and PHP, which requires careful processing during code conversion.

4. Summary

Although ASP and PHP are both server-side scripting languages, their syntax, structure and calling methods are very different. Therefore, converting ASP code into PHP code requires a careful understanding of syntax and code logic, and some specific details need to be paid attention to. Finally, it is recommended to use tools such as code editors for code conversion to improve conversion efficiency and code quality.

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