w3resource

PHP: gettype() function

Description

The gettype() function is used to get the type of a variable.

Version:

(PHP 4 and above)

Syntax:

gettype(var_name)

Parameter:

Name Description Required /
Optional
Type
var_name The name of the variable. Required Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value

Possible values of the returned string:

  • boolean
  • integer
  • double
  • string
  • array
  • object
  • resource
  • NULL
  • unknown type

Pictorial presentation of PHP gettype() function

Pictorial presentation of PHP gettype() function

Example :

<?php
echo gettype(102).'<br>';
echo gettype(true).'<br>';
echo gettype(' ').'<br>';
echo gettype(null).'<br>';
echo gettype(array()).'<br>';
echo gettype(new stdclass());
?>

Output:

integer
boolean
string
NULL
array
object 

View the example in the browser

Practice here online :

See also

PHP Function Reference

Previous: get_resource_type
Next: import_request_ variables



PHP: Tips of the Day

SQL injection that gets around mysql_real_escape_string()

Consider the following query:

$iId = mysql_real_escape_string("1 OR 1=1");    
$sSql = "SELECT * FROM table WHERE id = $iId";

mysql_real_escape_string() will not protect you against this. The fact that you use single quotes (' ') around your variables inside your query is what protects you against this. The following is also an option:

$iId = (int)"1 OR 1=1";
$sSql = "SELECT * FROM table WHERE id = $iId";

Ref : https://bit.ly/32q3bJ7