PHP experience sharing: common tips _ PHP tutorials

PHP experience sharing: common tips. PHP is short for HypertextPreprocessor. PHP is an embedded HTML language and a script language that is executed on the server side to embed HTML documents, PHPIs short for Hypertext Preprocessor. PHP is an embedded HTML language. it is a scripting language that executes HTML documents embedded on the server. it is widely used in a style similar to C language. This article summarizes eight tips commonly used in daily PHP development.

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When the plan is considered as part of an SQL command: If the field involved in the control is numeric

 
 

  
  
if(! emptyempty($_POST['checkbox'])) { 
  
  
$expr = join(",", $_POST['checkbox']); 
  
  
$sql = "select * from tbl_name where field in ($expr)"; 
  
  
} 
 
 

If the field involved in the control is numeric

 
 

  
  
if(! emptyempty($_POST['checkbox'])) { 
  
  
$expr = "'".join("','", $_POST['checkbox'])."."; 
  
  
$sql = "select * from tbl_name where field in ($expr)"; 
  
  
} 
 
 

PHP checks whether the Form is submitted

 
 

  
  
$ Action = $ HTTP_POST_VARS ["Button1"];
  
  
If ($ action = "submit ")
  
  
{
  
  
// Execute the form operation
  
  
}
  
  
Else
  
  
{
  
  
// Read the default value
  
  
}
 
 

PHP obtains the string length

 
 

  
  
strlen($myrow[1]) 
 
 

PHP Url redirection

 
 

  
  
Header("Location: ".$_SERVER["HTTP_REFERER"]); 
 
 

PHP Super global object

 
 

  
  
 
  
  
$a = 1; 
  
  
$b = 2; 
  
  
function Sum() 
  
  
{ 
  
  
$GLOBALS["b"] = $GLOBALS["a"] + $GLOBALS["b"]; 
  
  
} 
  
  
Sum(); 
  
  
echo $b; 
  
  
?> 
 
 

PHP form value

If mothod = "get", replace $ _ GET ["test"] with $ test.
If mothod = "post", replace $ _ POST ["test"] with $ test.

PHP obtains the current IP address

 
 

  
  
  
  
  
PHP gets the current time
  
  
 
  
  
 
  
  
Echo date ("Y-m-d G: I: s ");
  
  
?>
  
  
Date ("Y, m, d ")
  
  
Date ("Y-n-j ")
 
 

I hope this article will help you.

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